119-543: Torness nuclear power station is a nuclear power station located approximately 30 miles (50 km) east of Edinburgh at Torness Point near Dunbar in East Lothian, Scotland. It was the last of the United Kingdom's Advanced Gas-cooled Reactors to be fully commissioned. Construction of this facility began in 1980 for the then South of Scotland Electricity Board (SSEB) and it was commissioned in 1988. It
238-518: A Class 41 (an HST prototype) achieved a top speed of 143 mph (230 km/h) in a test run. In the 1980s, the line was electrified and InterCity 225 trains introduced. These have in turn been largely replaced by Class 800 and Class 801 units. The November 2021 Integrated Rail Plan for the North and Midlands stated that the linespeed would be upgraded to 140 mph (225 km/h). The line links London, South East England , East Anglia and
357-758: A 1904 proposal by the Great Northern Railway to electrify its suburban services from London. A short stretch of the ECML in the Newcastle area was electrified with a third rail in 1904, as part of the North Eastern Railway 's suburban Tyneside Electrics scheme. Following the success of this scheme, in 1919 the North Eastern Railway, planned to electrify 80 miles (130 km) of the main line between York and Newcastle;
476-561: A 58 per cent increase in passengers. The programme also electrified the Edinburgh-Carstairs branch of the WCML, to allow InterCity 225 sets to access Glasgow Central , with the added benefit of creating an electrified path to/from Edinburgh on the WCML from the south. In total the electrification programme covered roughly 1,400 single-track miles (2,300 km) and required major infrastructure changes, including resignalling of
595-465: A condenser. The condenser is a heat exchanger which is connected to a secondary side such as a river or a cooling tower . The water is then pumped back into the steam generator and the cycle begins again. The water-steam cycle corresponds to the Rankine cycle . The nuclear reactor is the heart of the station. In its central part, the reactor's core produces heat due to nuclear fission. With this heat,
714-442: A coolant is heated as it is pumped through the reactor and thereby removes the energy from the reactor. The heat from nuclear fission is used to raise steam, which runs through turbines , which in turn power the electrical generators. Nuclear reactors usually rely on uranium to fuel the chain reaction. Uranium is a very heavy metal that is abundant on Earth and is found in sea water as well as most rocks. Naturally occurring uranium
833-402: A facility has been completely decommissioned it is released from regulatory control, and the licensee of the station no longer has responsibility for its nuclear safety. Generally speaking, nuclear stations were originally designed for a life of about 30 years. Newer stations are designed for a 40 to 60-year operating life. The Centurion Reactor is a future class of nuclear reactor that
952-507: A heavy train over long distances, immediately cut over one hour from the standard London to Edinburgh journey time, from seven hours to under six. Further improvements to the infrastructure meant that by the mid-1970s, another half-hour had been cut from the journey time. In the years following the introduction of the Deltics, sections of the ECML were upgraded for trains running at speeds of up to 100 mph (160 km/h). On 15 June 1965,
1071-408: A large role in the decision to proceed. Construction began on the second phase in 1985. In 1986 the section to Huntingdon was completed; Leeds was reached in 1988, then York in 1989 and Edinburgh in 1991. Electric services on the full length of the line began on 8 July 1991, eight weeks later than scheduled. Significant traffic increases occurred in the two years after completion; one station recorded
1190-401: A nuclear power station worldwide, and far more sophisticated than earlier members of the advanced gas-cooled reactor fleet. Over 70 Ferranti Argus 700 computers are used in the control and instrumentation systems, which included Digital Direct Control (DDC) of the reactors. In 2020, the staff training simulator was replaced, partly to reflect plant upgrades and to simulate interactions between
1309-404: A nuclear reactor heats the reactor coolant. The coolant may be water or gas, or even liquid metal, depending on the type of reactor. The reactor coolant then goes to a steam generator and heats water to produce steam. The pressurized steam is then usually fed to a multi-stage steam turbine . After the steam turbine has expanded and partially condensed the steam, the remaining vapor is condensed in
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#17327647315611428-683: A nuclear reactor was used to generate electricity was on December 21, 1951, at the Experimental Breeder Reactor I , powering four light bulbs. On June 27, 1954, the world's first nuclear power station to generate electricity for a power grid , the Obninsk Nuclear Power Plant , commenced operations in Obninsk , in the Soviet Union . The world's first full scale power station, Calder Hall in
1547-483: A nuclear station is smaller than the fuel cost for operation of coal or gas plants. Since most of the cost of nuclear power plant is capital cost, there is almost no cost saving by running it at less than full capacity. Nuclear power plants are routinely used in load following mode on a large scale in France, although "it is generally accepted that this is not an ideal economic situation for nuclear stations". Unit A at
1666-516: A number of long-established projects are struggling to find financing, notably Belene in Bulgaria and the additional reactors at Cernavodă in Romania , and some potential backers have pulled out. Where cheap gas is available and its future supply relatively secure, this also poses a major problem for nuclear projects. Analysis of the economics of nuclear power must take into account who bears
1785-513: A pair of Napier Deltic engines that had been developed for fast torpedo boats. The Class 55 'Deltics' were for a time the fastest and most powerful diesel locomotives in service in Britain, capable of reaching 100 mph (160 km/h) and providing up to 3,300 hp (2,500 kW). When introduced into service in 1961, the Class 55's ability to rapidly accelerate and maintain high speed with
1904-444: A previous goal aimed to reduce nuclear electricity generation share to lower than fifty percent by 2025, this target was postponed to 2035 in 2019 and ultimately discarded in 2023. Russia continues to export the most nuclear power plants in the world, with projects across various countries: as of July 2023, Russia was constructing 19 out of 22 reactors constructed by foreign vendors; however, some exporting projects were canceled due to
2023-628: A shortened InterCity 125 train of two Class 43 power cars and three coaches during a southbound run from Darlington to York. At least two other trains have subsequently recorded higher speeds, but as of February 2023 the InterCity 125 record remains the highest to have been officially verified. A British speed record for electric locomotives of 161.7 mph (260.2 km/h) was achieved on 17 September 1989, also at Stoke Bank, by Class 91 locomotive number 91010. On 26 September 1991, an InterCity 225 shortened electric locomotive train
2142-591: A significantly different evaluation of the economics of new nuclear power stations. Following the 2011 Fukushima nuclear accident in Japan , costs are likely to go up for currently operating and new nuclear power stations, due to increased requirements for on-site spent fuel management and elevated design basis threats. However many designs, such as the currently under construction AP1000, use passive nuclear safety cooling systems, unlike those of Fukushima I which required active cooling systems, which largely eliminates
2261-589: A site for a nuclear power station. A public exhibition was held at Dunbar in February 1974 to explain the Board's proposals, and in June 1974, a public inquiry was held. There was widespread public opposition to the building of a nuclear plant at Torness. Diverse campaigning groups came together to highlight the environmental and human cost of nuclear power stations. In May 1978, 4,000 people marched from Dunbar to occupy
2380-413: A slight decrease from the 2653 TWh produced in 2021. Thirteen countries generated at least one-quarter of their electricity from nuclear sources. Notably, France relies on nuclear energy for about 70% of its electricity needs, while Ukraine , Slovakia , Belgium , and Hungary source around half their power from nuclear. Japan , which previously depended on nuclear for over a quarter of its electricity,
2499-427: A small enough volume to become supercritical. Most reactors require continuous temperature control to prevent a core meltdown , which has occurred on a few occasions through accident or natural disaster, releasing radiation and making the surrounding area uninhabitable. Plants must be defended against theft of nuclear material and attack by enemy military planes or missiles. The most serious accidents to date have been
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#17327647315612618-493: A special design of overhead wiring was developed for use on the visually-sensitive Royal Border Bridge , as well as the Croxdale and Durham City viaducts . Elsewhere the standard Mk. 3B equipment was deployed. The electrification was completed at a cost of £344.4 million (at 1983 prices, equivalent to £1169.3 million in 2023), a minor overrun against its authorised expenditure of £331.9 million. Of
2737-426: A steady green aspect the driver would reduce speed to no greater than 125 mph, and thus be ready to react to subsequent signals in the same manner as when driving a lower-speed train. The testing found, however, that drivers couldn't be expected to consistently and accurately interpret and respond to lineside signals when driving at the higher speed, and regulations were later changed throughout Britain to require
2856-482: A three-year research study of offshore floating nuclear power generation. In October 2022, NuScale Power and Canadian company Prodigy announced a joint project to bring a North American small modular reactor based floating plant to market. The economics of nuclear power plants is a controversial subject, and multibillion-dollar investments ride on the choice of an energy source. Nuclear power stations typically have high capital costs, but low direct fuel costs, with
2975-580: A worldwide perspective, long-term waste storage costs are uncertain. Construction, or capital cost aside, measures to mitigate global warming such as a carbon tax or carbon emissions trading , increasingly favor the economics of nuclear power. Further efficiencies are hoped to be achieved through more advanced reactor designs, Generation III reactors promise to be at least 17% more fuel efficient, and have lower capital costs, while Generation IV reactors promise further gains in fuel efficiency and significant reductions in nuclear waste. In Eastern Europe,
3094-496: Is a thermal power station in which the heat source is a nuclear reactor . As is typical of thermal power stations, heat is used to generate steam that drives a steam turbine connected to a generator that produces electricity . As of September 2023 , the International Atomic Energy Agency reported that there were 410 nuclear power reactors in operation in 32 countries around
3213-656: Is a local landmark, highly visible from the A1 trunk road and East Coast Main Line railway. The power station is expected to be shut down in 2028, prior to defuelling and then decommissioning. After extensive discussions with the local planning authority and more than twenty other interested organisations, the South of Scotland Electricity Board (SSEB) sought approval of the Secretary of State for Scotland in 1973 for Torness as
3332-668: Is about 1/3 of solar and 1/45 of natural gas and 1/75 of coal . Newer models, like HPR1000 , produce even less carbon dioxide during the whole operating life, as little as 1/8 of power plants using gen II reactors for 1.31g/kWh. East Coast Main Line The East Coast Main Line ( ECML ) is a 393-mile long (632 km) electrified railway between its northern terminus at Edinburgh Waverley and southern terminus at London King's Cross station . The key towns and cities of Peterborough , Doncaster , York , Darlington , Durham and Newcastle are on
3451-527: Is anticipated to resume similar levels of nuclear energy utilization. Over the last 15 years, the United States has seen a significant improvement in the operational performance of its nuclear power plants, enhancing their utilization and efficiency, adding the output equivalent to 19 new 1000 MWe reactors without actual construction. In France, nuclear power plants still produce over sixty percent of this country's total power generation in 2022. While
3570-503: Is being designed to last 100 years. One of the major limiting wear factors is the deterioration of the reactor's pressure vessel under the action of neutron bombardment, however in 2018 Rosatom announced it had developed a thermal annealing technique for reactor pressure vessels which ameliorates radiation damage and extends service life by between 15 and 30 years. Nuclear stations are used primarily for base load because of economic considerations. The fuel cost of operations for
3689-725: Is carried along its route by several bridges and viaducts which are recognised as architecturally significant listed structures ; the longest of which is the 659-metre-long (2,162 ft) Royal Border Bridge at Berwick-upon-Tweed . Others include Digswell Viaduct , near Welwyn Garden City , at 475 m (1,558 ft), the Ouseburn Viaduct in Newcastle at 280 m (920 ft), Durham Viaduct at 240 m (790 ft), and Chester Burn Viaduct in Chester-le-Street at 230 m (750 ft). The 350-metre-long (1,150 ft) King Edward VII Bridge in Newcastle
Torness nuclear power station - Misplaced Pages Continue
3808-548: Is currently limiting speeds to 125 mph. There are currently no plans to retrofit ERTMS equipment to the InterCity 225 fleet, as they are expected to be withdrawn before the removal of the lineside signals; this means they will never reach their design speed of 140 mph (225 km/h) in service. The line is mainly quadruple track from London to Stoke Tunnel, south of Grantham , with two double track sections: one between Digswell Jn & Woolmer Green Jn, where
3927-431: Is found in two different isotopes : uranium-238 (U-238), accounting for 99.3% and uranium-235 (U-235) accounting for about 0.7%. U-238 has 146 neutrons and U-235 has 143 neutrons. Different isotopes have different behaviors. For instance, U-235 is fissile which means that it is easily split and gives off a lot of energy making it ideal for nuclear energy. On the other hand, U-238 does not have that property despite it being
4046-580: Is on fairly straight track on the flatter, eastern side of England, through Lincolnshire and Cambridgeshire , though there are significant speed restrictions because of the line's curvature particularly north of Darlington and between Doncaster and Leeds. By contrast, the West Coast Main Line crosses the Trent Valley and the mountains of Cumbria , with more curvature and had a lower speed limit of 110 mph (180 km/h). Speeds on
4165-563: Is provided by Hull Trains , Grand Central and Lumo . The ECML is part of Network Rail 's Strategic Route G, which comprises five separate lines: The core route is the main line between King's Cross and Edinburgh, the Hertford Loop is used for local and freight services, and the Northern City Line provides an inner-suburban service to the city. The line has engineers line references (ELR) ECM1 to ECM9. The ECML
4284-429: Is the only nuclear facility that does not use a natural body of water for cooling, instead it uses treated sewage from the greater Phoenix metropolitan area. The water coming from the cooling body of water is either pumped back to the water source at a warmer temperature or returns to a cooling tower where it either cools for more uses or evaporates into water vapor that rises out the top of the tower. The water level in
4403-489: The BWR , the steam is directed into the suppression chamber and condenses there. The chambers on a heat exchanger are connected to the intermediate cooling circuit. The main condenser is a large cross-flow shell and tube heat exchanger that takes wet vapor, a mixture of liquid water and steam at saturation conditions, from the turbine-generator exhaust and condenses it back into sub-cooled liquid water so it can be pumped back to
4522-540: The East Midlands , with Yorkshire , the North East and Scotland, and is important to their local economies. It carries commuter traffic in north London as well as cross-country, commuter and local passenger services, and freight . In 1997, operations were privatised. The primary long-distance operator is London North Eastern Railway , but open-access competition on services to Northern England and Scotland
4641-712: The Eastern Region , the North Eastern Region , and the Scottish Region (the former two were merged together in 1967). In the early 1960s, steam locomotives were replaced by diesel-electrics , amongst them the Deltic , a powerful high-speed locomotive developed and built by English Electric . The prototype was successful and a fleet of 22 locomotives were built and put into BR service for express traffic. Designated Class 55 , they were powered by
4760-541: The London, Midland and Scottish Railway (LMS) for long-distance passenger traffic between London and Scotland. The LNER's chief mechanical engineer Nigel Gresley designed iconic Pacific steam locomotives including Flying Scotsman and Mallard , the latter of which achieved a world record speed for a steam locomotive, 126 mph (203 km/h) on the Grantham-to-Peterborough section. In 1948,
4879-681: The Midland Main Line . The infrastructure supported speeds of up to 140 mph, allowing a non-stop run of three hours and 29 minutes between London and Edinburgh on 26 September 1991. As part of testing done to support safe operation the increased maximum speed, BR experimented in 1988 with using a fifth signalling aspect – flashing green – on the fast lines between Peterborough and Stoke Tunnel. The flashing green aspect appeared at signals preceding one displaying an ordinary steady green aspect, and authorised running at up to 140 mph. Upon encountering
Torness nuclear power station - Misplaced Pages Continue
4998-503: The National Coal Board to pay for the construction of the 14-mile-long (23 km) Selby Diversion . Construction commenced in 1980, and was completed in late 1983 at a cost of £63 million (equivalent to £214 million in 2023). The new section diverged from the original alignment at Temple Hirst Junction, north of Doncaster, bypassed Selby station and the area to be undermined by coal workings, and then joined
5117-660: The Penmanshiel tunnel collapse in the Scottish Borders in 1979 necessitated urgent works to divert the line around the irreparably-damaged tunnel; ultimately the line was closed for five months and around 1,100 yards (1 km) of the original alignment had to be abandoned. In the late 1970s in the north of England, the development of the Selby Coalfield – and the anticipated subsidence that might result from its workings – led
5236-496: The Russian invasion of Ukraine . Meanwhile, China continues to advance in nuclear energy: having 25 reactors under construction by late 2023, China is the country with the most reactors being built at one time in the world. Nuclear decommissioning is the dismantling of a nuclear power station and decontamination of the site to a state no longer requiring protection from radiation for the general public. The main difference from
5355-678: The UAE launched the Arab region's first-ever nuclear energy plant. Unit 1 of the Barakah plant in the Al Dhafrah region of Abu Dhabi commenced generating heat on the first day of its launch, while the remaining 3 Units are being built. However, Nuclear Consulting Group head, Paul Dorfman, warned the Gulf nation's investment into the plant as a risk "further destabilizing the volatile Gulf region, damaging
5474-657: The United Kingdom , opened on October 17, 1956 and was also meant to produce plutonium . The world's first full scale power station solely devoted to electricity production was the Shippingport Atomic Power Station in Pennsylvania , United States, which was connected to the grid on December 18, 1957. The conversion to electrical energy takes place indirectly, as in conventional thermal power stations. The fission in
5593-551: The West Coast Main Line (WCML) and ECML; a detailed plan drawn up in 1957 gave a completion date of 1970 for ECML electrification. However, the East Coast authorities decided that they could not wait over a decade for service improvements, and instead decided to invest in high-speed diesel traction, the Deltic and High Speed Train, as an interim measure to implement improved services, whilst West Coast electrification proceeded, and
5712-534: The West Coast Main Line (WCML) were increased with the introduction of tilting Pendolino trains and now match the 125 mph speeds on the ECML. The line's current principal operator is London North Eastern Railway (LNER), whose services include regular long-distance expresses between King's Cross, the East Midlands, Yorkshire, the North East of England and Scotland. LNER is operated on behalf of
5831-614: The 1950s and 1960s to build the UK's commercial nuclear power stations. NNC is now part of Jacobs Engineering Group . The graphite-moderated, gas-cooled design was proven at the WAGR – the Windscale experimental AGR facility – and is a significant evolution of the Magnox reactor designs. When first operated Torness probably had the most sophisticated and complex computerised control system for
5950-424: The 1970s and 1980s, when it "reached an intensity unprecedented in the history of technology controversies," in some countries. Proponents argue that nuclear power is a sustainable energy source which reduces carbon emissions and can increase energy security if its use supplants a dependence on imported fuels. Proponents advance the notion that nuclear power produces virtually no air pollution, in contrast to
6069-485: The 1979 Three Mile Island accident , the 1986 Chernobyl disaster , and the 2011 Fukushima Daiichi nuclear disaster , corresponding to the beginning of the operation of generation II reactors . Professor of sociology Charles Perrow states that multiple and unexpected failures are built into society's complex and tightly coupled nuclear reactor systems. Such accidents are unavoidable and cannot be designed around. An interdisciplinary team from MIT has estimated that given
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#17327647315616188-572: The Brussels supplementary convention, and the Vienna Convention on Civil Liability for Nuclear Damage . However states with a majority of the world's nuclear power stations, including the U.S., Russia, China and Japan, are not party to international nuclear liability conventions. The nuclear power debate about the deployment and use of nuclear fission reactors to generate electricity from nuclear fuel for civilian purposes peaked during
6307-750: The Department for Transport by a consortium of Arup Group , Ernst & Young and SNC-Lavalin Rail & Transit , which took over from Virgin Trains East Coast on 24 June 2018. Other operators of passenger trains on the line are: Eurostar previously held the rights to run five trains a day on the line for services from mainland Europe to cities north of London, as part of the Regional Eurostar plan, which never came to fruition. The overnight Caledonian Sleeper occasionally uses
6426-422: The ECML represented the best value by far. Its in-house forecasts determined that increases in revenue and considerable reductions in energy and maintenance costs would occur by electrifying the line. In 1984, the decision was made to commence the electrification of the rest of the ECML to Edinburgh and Leeds. The Secretary of State for Transport Nicholas Ridley and Minister for Railways David Mitchell played
6545-487: The ECML were offered to bidders as the InterCity East Coast franchise. It was held by Great North Eastern Railway from 1996 until 2007, when the company experienced financial difficulties; the franchise then passed to National Express East Coast until in 2009, when it too encountered financial problems and the government was forced to run the franchise itself as ' East Coast '. Another attempt at returning
6664-470: The ECML. LNER's 4468 Mallard set the record for a steam locomotive at 126 mph (203 km/h) whilst descending Stoke Bank on 3 July 1938. The record remains standing today, and a trackside sign was erected in July 1998 at the 90 + 1 ⁄ 4 milepost to commemorate the achievement. The world record for diesel-powered trains was set at 148 mph (238 km/h) on 1 November 1987, by
6783-503: The ECML. Where the existing bridge clearance was insufficient, project managers favoured wherever possible the rebuilding of the bridge rather than the lowering of the track, as the latter requires considerable civil works and can create long-term drainage problems. Where listed buildings were to be affected by the programme, BR sought approval for its plans from the Royal Fine Art Commission . Through this process
6902-543: The LNER and its West Coast competitor, the London, Midland and Scottish Railway (LMS), produced ever-more-powerful express locomotives. This reached its crescendo in the late 1930s, when the LNER introduced the famous streamlined Class A4 locomotives and the LMS countered with its own streamlined Coronation Class – both of which were capable of reaching speeds in excess of 100 mph (160 km/h). The competition
7021-520: The Leeds–York line of the former York and North Midland Railway at Colton Junction, south-west of York. The old line between Selby and York was dismantled and is now a public cycleway. Mining subsidence discovered in 2001 also necessitated the realignment of 1.8 km (1.1 mi) of line at Dolphingstone in East Lothian , between Prestonpans and Wallyford stations. The new alignment takes
7140-796: The Light Water Reactor ( LWR ) and the High Temperature Reactor (HTR). In February 1975, the Secretary of State for Scotland granted the SSEB statutory consent for the location of future nuclear power stations and, after review of the four alternative reactor types, consent was given on 24 May 1978 for construction of the AGR station. The construction, which was undertaken by a consortium known as National Nuclear Corporation ('NNC'), began in 1980. The reactors were supplied by NNC,
7259-549: The NBR between Berwick and Edinburgh (agreed in 1862 but not exercised until 1869). The entire ECML came under control of the London and North Eastern Railway (LNER) in 1923, under the Railways Act 1921 which 'grouped' many small railway companies into four large ones . The LNER was the second largest railway company in Britain, its routes were located to the north and east of London. The LNER appointed Nigel Gresley (who
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#17327647315617378-597: The Torness site. Many of them signed a declaration to “take all nonviolent steps necessary to prevent the construction of a nuclear power station at Torness”. The SSEB submitted designs for four types of reactor then being considered by HM Government for the next stage of the UK civil nuclear programme : the advanced gas-cooled reactor (AGR), the Steam Generating Heavy Water Reactor ( SGHWR ),
7497-711: The Widened Lines route and the GWML, where ERTMS complements traditional lineside signals, the southern ECML will have its signals removed once the transition period to ERTMS is complete. This means that all trains running on the route will be required to be fitted with the appropriate onboard equipment. The Class 800 series (LNER Azuma Classes 800 and 801 , Hull Trains Paragon Class 802 , Lumo Class 803 ), Thameslink Class 700 and Great Northern Class 717 fleets are fitted with ERTMS equipment from manufacture. The Great Northern Class 387 fleet are undergoing retrofit, with
7616-456: The boilers by NEI and the turbines by GEC . The station consists of two advanced gas-cooled reactors (AGR) capable of producing a peak rating of 1,364 MWe . In February, 1989, Torness Unit 2 became the last Advanced Gas-cooled Reactor commissioned. On deregulation of the United Kingdom's electricity generation market the following year, Torness passed to the state-owned Scottish Nuclear , privatised as part of British Energy which
7735-557: The chief viable alternative of fossil fuel. Proponents also believe that nuclear power is the only viable course to achieve energy independence for most Western countries. They emphasize that the risks of storing waste are small and can be further reduced by using the latest technology in newer reactors, and the operational safety record in the Western world is excellent when compared to the other major kinds of power plants. Opponents say that nuclear power poses many threats to people and
7854-493: The costs of fuel extraction, processing, use and spent fuel storage internalized costs. Therefore, comparison with other power generation methods is strongly dependent on assumptions about construction timescales and capital financing for nuclear stations. Cost estimates take into account station decommissioning and nuclear waste storage or recycling costs in the United States due to the Price Anderson Act . With
7973-400: The crossing with a flyover or tunnel, which would increase capacity on both lines, have been proposed on several occasions but are complicated by costs and spatial constraints at the site. With most of the line rated for 125 mph (200 km/h) operation, the ECML was the fastest main line in the UK until the opening of High Speed 1 . The high speeds are possible because much of the line
8092-424: The destruction of a turbine in operation from flying towards the reactor. In the case of a pressurized water reactor, the steam turbine is separated from the nuclear system. To detect a leak in the steam generator and thus the passage of radioactive water at an early stage, an activity meter is mounted to track the outlet steam of the steam generator. In contrast, boiling water reactors pass radioactive water through
8211-458: The dismantling of other power stations is the presence of radioactive material that requires special precautions to remove and safely relocate to a waste repository. Decommissioning involves many administrative and technical actions. It includes all clean-up of radioactivity and progressive demolition of the station. Once a facility is decommissioned, there should no longer be any danger of a radioactive accident or to any persons visiting it. After
8330-534: The energy-intensive stages of the nuclear fuel chain are considered, from uranium mining to nuclear decommissioning , nuclear power is not a low-carbon electricity source despite the possibility of refinement and long-term storage being powered by a nuclear facility. Those countries that do not contain uranium mines cannot achieve energy independence through existing nuclear power technologies. Actual construction costs often exceed estimates, and spent fuel management costs are difficult to define. On 1 August 2020,
8449-402: The environment and raising the possibility of nuclear proliferation." Nuclear power plants do not produce greenhouse gases during operation. Older nuclear power plants, like ones using second-generation reactors , produce approximately the same amount of carbon dioxide during the whole life cycle of nuclear power plants for an average of about 11g/kWh, as much power generated by wind , which
8568-775: The environment, and that costs do not justify benefits. Threats include health risks and environmental damage from uranium mining , processing and transport, the risk of nuclear weapons proliferation or sabotage, and the problem of radioactive nuclear waste . Another environmental issue is discharge of hot water into the sea. The hot water modifies the environmental conditions for marine flora and fauna. They also contend that reactors themselves are enormously complex machines where many things can and do go wrong, and there have been many serious nuclear accidents . Critics do not believe that these risks can be reduced through new technology , despite rapid advancements in containment procedures and storage methods. Opponents argue that when all
8687-411: The environment. In addition, many reactors are equipped with a dome of concrete to protect the reactor against both internal casualties and external impacts. The purpose of the steam turbine is to convert the heat contained in steam into mechanical energy. The engine house with the steam turbine is usually structurally separated from the main reactor building. It is aligned so as to prevent debris from
8806-525: The expected growth of nuclear power from 2005 to 2055, at least four serious nuclear accidents would be expected in that period. The MIT study does not take into account improvements in safety since 1970. Nuclear power works under an insurance framework that limits or structures accident liabilities in accordance with the Paris Convention on Third Party Liability in the Field of Nuclear Energy ,
8925-444: The fastest London–Edinburgh timing down by another hour, to 4 + 1 ⁄ 2 hours. They operated most express passenger services on the line until electrification was completed in 1991, after which they continued in use on services that run off the ECML and onto non-electrified lines. Generally popular with the public, and considered by some to be iconic, they ran on the ECML for 41 years, before being withdrawn in 2019. In 1973,
9044-543: The first length of high-speed line, a 17 miles (27 km) stretch between Peterborough and Grantham, was completed. The next section was 12 miles (19 km) of line between Grantham and Newark and more sections were upgraded to enable high speeds along much of the line. Continuing demand for reduced journey times led British Rail to introduce a successor to the Deltics, the InterCity 125 High Speed Train (HST) between 1978 and 1979. These could reach speeds up to 125 mph (201 km/h) on existing infrastructure, bringing
9163-529: The first train sent to Worksop Depot in October 2022. Following its return to service in July 2023, the remaining trains will be retrofitted in Hornsey Depot. The introduction of in-cab signaling will allow the ECML line speed to be increased to 140 mph in some places. The Class 800 series trains were designed to reach this speed, but minor modifications will be required to remove the equipment that
9282-438: The form of a gentle curve of up to 77 m (253 ft) towards the south, supported by concrete slabs and other ground stabilisation and reinforcement techniques, and is designed to avoid the need for a permanent speed restriction. It came into use in the last week of April 2003, at a cost of £56 million (equivalent to £92 million in 2023). World speed records for both steam and diesel traction have been set on
9401-603: The franchise to private-sector operation was made by Virgin Trains East Coast in 2015, but this failed in 2018, and thus since then it has been run by the public sector through the government's operator of last resort procedure under the London North Eastern Railway brand. The route of the ECML has been altered or diverted several times, beginning with the opening of the King Edward VII Bridge in Newcastle upon Tyne in 1906. Later,
9520-406: The hot coolant is used as a heat source for a boiler, and the pressurized steam from that drives one or more steam turbine driven electrical generators . In the event of an emergency, safety valves can be used to prevent pipes from bursting or the reactor from exploding. The valves are designed so that they can derive all of the supplied flow rates with little increase in pressure. In the case of
9639-426: The hours over which the fixed cost of construction can be amortized. Nuclear power plants have a carbon footprint comparable to that of renewable energy such as solar farms and wind farms , and much lower than fossil fuels such as natural gas and coal . Nuclear power plants are among the safest modes of electricity generation, comparable to solar and wind power plants. The first time that heat from
9758-450: The impeller led to failure. In August, another gas circulator on the other reactor showed increasing vibration and was shut down by the operators. When it was taken apart, there was a fully developed fatigue related crack in a similar position to the first failure, but the prompt shutdown had prevented further damage. In August 2005, screens in the seawater cooling intake system were blocked by seaweed . This possibility had been foreseen for
9877-518: The line from Temple Hirst Junction (near Selby in Yorkshire) to the Scottish border; the construction of new signalling centres at Niddrie, York, and Newcastle; the commissioning of ten new connections to the national electricity grid; and structure clearance and electrical immunisation works along the length of the line. Included in the structure clearance works were the 127 overbridges that crossed
9996-612: The line passes over the Digswell Viaduct , Welwyn North station and the two Welwyn tunnels; and one between Fletton Junction (south of Peterborough) and Holme Junction, south of Holme Fen. The route between Holme Junction and Huntingdon is mostly triple track, with the exception of a southbound loop between Conington and Woodwalton. North of Grantham the line is double track except for quadruple-track sections at Retford , around Doncaster, between Colton Junction (south of York), Thirsk and Northallerton , and Newcastle. The line
10115-513: The line. Services were operated using "East Coast Joint Stock" until 1922. The trains were hauled by GNR locomotives between King's Cross and York, which entailed utilisation of GNR running powers over the NER between Shaftholme Junction and York (which had been agreed in 1849 and exercised from the opening of the GNR in 1850); and by NER locomotives between York and Edinburgh, using NER running powers over
10234-481: The line. The line is a key transport artery on the eastern side of Great Britain running broadly parallel to the A1 road . The main line acts as a 'spine' for several diverging branches, serving destinations such as Cambridge , Leeds , Hull , Sunderland and Lincoln , all with direct services to London. In addition, a few ECML services extend beyond Edinburgh to serve other Scottish destinations, such as Stirling , Inverness , Aberdeen or Glasgow Central , although
10353-550: The lineside signalling system on the southern ECML between London King's Cross and the Stoke Tunnel was commissioned in 1977 and as such was up for renewal between 2020 and 2029. Instead of renewing the current lineside signalling, it was decided to upgrade this section of the ECML to ERTMS in-cab signalling. This will not be the first instance of ERTMS on the UK rail network; it is in use on the Cambrian Line (where it
10472-551: The need to spend more on redundant back up safety equipment. According to the World Nuclear Association , as of March 2020: The Russian state nuclear company Rosatom is the largest player in international nuclear power market, building nuclear plants around the world. Whereas Russian oil and gas were subject to international sanctions after the Russian full-scale invasion of Ukraine in February 2022, Rosatom
10591-483: The now decommissioned German Biblis Nuclear Power Plant was designed to modulate its output 15% per minute between 40% and 100% of its nominal power. Russia has led in the practical development of floating nuclear power stations , which can be transported to the desired location and occasionally relocated or moved for easier decommissioning. In 2022, the United States Department of Energy funded
10710-422: The plant and preprepared plans were activated, leading to both reactors being shut down. In June 2011, both reactors were manually shut down due to reduced flow of seawater after intakes were clogged by a large mass of jellyfish . Nuclear power station A nuclear power plant ( NPP ), also known as a nuclear power station ( NPS ), nuclear generating station ( NGS ) or atomic power station ( APS )
10829-482: The power station following an engine failure. The UK Ministry of Defence commended the two crew members for demonstrating "exceptional levels of airmanship and awareness in the most adverse of conditions", because they ensured that the Tornado was clear of the power station before abandoning the aircraft. In May 2002, a gas circulator pump failed. Forensic evidence suggested an undetected fatigue crack in part of
10948-477: The principal London-Glasgow route is the West Coast Main Line (WCML). The line was built during the 1840s by three railway companies, the North British Railway , the North Eastern Railway , and the Great Northern Railway . In 1923, the Railways Act 1921 led to their amalgamation to form the London and North Eastern Railway (LNER) and the line became its primary route. The LNER competed with
11067-474: The prospect that all spent nuclear fuel could potentially be recycled by using future reactors, generation IV reactors are being designed to completely close the nuclear fuel cycle . However, up to now, there has not been any actual bulk recycling of waste from a NPP, and on-site temporary storage is still being used at almost all plant sites due to construction problems for deep geological repositories . Only Finland has stable repository plans, therefore from
11186-402: The prototype HST British Rail Class 41 recorded a top speed of 143 mph (230 km/h) in a test run on the line. There had been proposals to electrify all or parts of the ECML as far back as the early 1900s, but no significant scheme was implemented until the 1970s and 1980s, with the entire line being electrified in two stages between 1976 and 1991. Early proposed schemes included
11305-454: The railways were nationalised and operated by British Railways . In the early 1960s, steam was replaced by diesel-electric traction , including the Deltics , and sections of the line were upgraded so that trains could run at speeds of up to 100 mph (160 km/h). With the demand for higher speed, British Rail introduced InterCity 125 high-speed trains between 1976 and 1981. In 1973,
11424-427: The reactor by the condensate and feedwater pumps. In the main condenser, the wet vapor turbine exhaust come into contact with thousands of tubes that have much colder water flowing through them on the other side. The cooling water typically come from a natural body of water such as a river or lake. Palo Verde Nuclear Generating Station , located in the desert about 97 kilometres (60 mi) west of Phoenix, Arizona,
11543-540: The risks of future uncertainties. To date all operating nuclear power stations were developed by state-owned or regulated utilities where many of the risks associated with construction costs, operating performance, fuel price, and other factors were borne by consumers rather than suppliers. Many countries have now liberalized the electricity market where these risks and the risk of cheaper competitors emerging before capital costs are recovered, are borne by station suppliers and operators rather than consumers, which leads to
11662-407: The same element. Different isotopes also have different half-lives . U-238 has a longer half-life than U-235, so it takes longer to decay over time. This also means that U-238 is less radioactive than U-235. Since nuclear fission creates radioactivity, the reactor core is surrounded by a protective shield. This containment absorbs radiation and prevents radioactive material from being released into
11781-408: The scheme progressed as far as a prototype locomotive , however it was cancelled on financial grounds after 1923 when the NER was grouped into the LNER, and the new management had no interest in pursuing the scheme. In the early-1930s, studies were conducted into electrifying sections or all of the ECML. British Rail 's 1955 modernisation plan placed equal importance on electrification of both
11900-693: The steam generator and the nuclear reactor is controlled using the feedwater system. The feedwater pump has the task of taking the water from the condensate system, increasing the pressure and forcing it into either the steam generators—in the case of a pressurized water reactor — or directly into the reactor, for boiling water reactors . Continuous power supply to the plant is critical to ensure safe operation. Most nuclear stations require at least two distinct sources of offsite power for redundancy. These are usually provided by multiple transformers that are sufficiently separated and can receive power from multiple transmission lines. In addition, in some nuclear stations,
12019-487: The steam turbine, so the turbine is kept as part of the radiologically controlled area of the nuclear power station. The electric generator converts mechanical power supplied by the turbine into electrical power. Low-pole AC synchronous generators of high rated power are used. A cooling system removes heat from the reactor core and transports it to another area of the station, where the thermal energy can be harnessed to produce electricity or to do other useful work. Typically
12138-649: The total cost, 60 per cent was for the electrification process itself, while the remaining 40 per cent covered rolling stock, including the new InterCity 225 trains procured specially for the route. These were introduced in 1989 to operate express services. They were developed by the General Electric Company (GEC), as the winners of a competitive tender process. The InterCity 225 sets were used alongside other rolling stock, including Class 90 locomotives and Class 317 electric multiple units. The displaced diesel trains were reallocated predominantly to
12257-477: The turbine generator can power the station's loads while the station is online, without requiring external power. This is achieved via station service transformers which tap power from the generator output before they reach the step-up transformer. Nuclear power plants generate approximately 10% of global electricity, sourced from around 440 reactors worldwide. They are recognized as a significant provider of low-carbon electricity , accounting for about one-quarter of
12376-551: The two reactor systems and with auxiliary systems, and to provide modern simulation capabilities. The original reactor control system was unchanged. Nuclear fuel for Torness power station can be delivered and removed via a loading/unloading facility on a branch from the adjacent East Coast Main Line . In November 1999, a Panavia Tornado F.3 of the Royal Air Force crashed into the North Sea less than 1 km from
12495-420: The use of in-cab signalling whenever running service trains at speeds above 125 mph. Nevertheless, the fifth aspect was not removed from signals in the test area , and the relevant track Sectional Appendix continued to list the capability to run special test trains in excess of 125 mph as recently as 2008. As part of the privatisation of British Rail in the mid-1990s, passenger operations on
12614-459: The world's supply in this category. As of 2020, nuclear power stood as the second-largest source of low-carbon energy, making up 26% of the total. Nuclear power facilities are active in 32 countries or regions, and their influence extends beyond these nations through regional transmission grids, especially in Europe. In 2022, nuclear power plants generated 2545 terawatt-hours (TWh) of electricity,
12733-402: The world, and 57 nuclear power reactors under construction. Building a nuclear power plant often spans five to ten years, which can accrue significant financial costs, depending on how the initial investments are financed. Because of this high construction cost and lower operations, maintenance, and fuel costs, nuclear plants are usually used for base load generation, because this maximizes
12852-842: Was authorised in 1971 for the benefit of London suburban services as part of the Great Northern Suburban Electrification Project , using Mk. 3A equipment. The scheme electrified 70 route miles (110 km), including the Hertford Loop Line , part of the Cambridge Line from Hitchin to Royston , and incorporated the Northern City Line to Moorgate . In the late 1970s, a working group of British Rail and Department for Transport officials convened and determined that, of all options for further electrification,
12971-652: Was authorised to reach speeds up to 140mph completing the London to Edinburgh journey in 3 hours 29 minutes. In November 2021, as part of the Integrated Rail Plan , the DfT announced a major upgrade of the line. The upgrade is set to include major track improvements and digital signalling, leading to higher speeds, reduced journey times and increases in seat capacity. The power supply will also be upgraded to allow longer and more frequent trains. The last refresh of
13090-569: Was connected to the Lancashire and Yorkshire Railway , a short section of which was used to reach the NER at Knottingley . In 1871, the line was shortened when the NER opened a direct line from an end-on junction, with the GNR, at Shaftholme, just south of Askern to Selby and over Selby Bridge on the Leeds - Hull line direct to York . Through journeys were important and lucrative for the companies and in 1860 they built special rolling stock for
13209-547: Was constructed by three independent railway companies. During the 1830s and 1840s, each company built part of the route to serve its own area, but also intending to link with other railways to form the through route that would become the East Coast Main Line. From north to south, the companies were: The GNR established an end-on connection with the NER at Askern , famously described by the GNR's chairman as in "a ploughed field four miles north of Doncaster". Askern
13328-528: Was curtailed soon thereafter by the coming of World War II . In the aftermath of the war, Clement Attlee 's Labour Government nationalised the LNER and the other three major railway companies in Great Britain with the passage of the Transport Act 1947 , and with effect from 1 January 1948 merged them into British Railways (BR). The ECML came under the control of three of BR's regions ;
13447-407: Was engaged in long running rivalry with the West Coast Main Line (WCML), the other main trunk route between London and Scotland. At various points in the late 19th century, highly publicised but unofficial races occurred between express trains on the two routes, most notably in 1888 and 1895. These races were ended over concerns over safety, but later the rivalry resumed in the 1920s and 1930s as both
13566-599: Was first piloted), on the Thameslink core Widened Lines route (with an ATO overlay), and on the Heathrow branch of the Great Western Main Line . However, it is the most complex application yet; never before in the UK has ERTMS been used on such a busy, mixed-traffic line, with freight , commuter , regional and InterCity services sharing as little as two tracks in the tightest sections. Unlike
13685-518: Was knighted in 1937) as its Chief Mechanical Engineer, and under his tenure, Pacific steam locomotives were developed as the standard express locomotive to work the line, several of which became famous, these included the Class A3 , including 4472 Flying Scotsman , and the later Class A4 , including 4468 Mallard . During this time Mallard set a new world-record speed for a steam locomotive (see § Speed records ). The East Coast Main Line
13804-422: Was largely complete by 1974. During the period when Richard Beeching was chairman of British Rail, WCML electrification with a spur from Carstairs to Edinburgh was seen as possible justification for the truncation of the ECML at Newcastle. British Rail carried out electrification of the southern part of the ECML with 25 kV AC overhead lines from London King's Cross to Hitchin between 1976 and 1977. This
13923-477: Was not targeted by sanctions. However, some countries, especially in Europe, scaled back or cancelled planned nuclear power plants that were to be built by Rosatom. Modern nuclear reactor designs have had numerous safety improvements since the first-generation nuclear reactors. A nuclear power plant cannot explode like a nuclear weapon because the fuel for uranium reactors is not enriched enough, and nuclear weapons require precision explosives to force fuel into
14042-686: Was opened in 1906, replacing the older High Level Bridge as the main railway crossing of the River Tyne . Newark flat crossing , where the ECML crosses the Nottingham–Lincoln line on the same level just north of Newark Northgate station, is one of only two remaining flat crossings in Britain, the other being on the Cambrian Line where it intersections with the Welsh Highland Railway . Plans for grade separating
14161-598: Was sold to the French company Électricité de France (EDF) in January 2009, and incorporated in the latter's UK subsidiary EDF Energy . It was expected to operate until 2030. Cracking is now expected to cause the closure of the plant in March 2028. Torness shares its design with Heysham 2 nuclear power station. The station was designed by NNC, a company created from the gradual amalgamation of five consortia that were formed in
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