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e sufficiently separated and can receive power from multiple transmission lines in addition in some nuclear stations 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 economics edit bruce nuclear generating station the largest operational nuclear power facility in the world 20 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 the costs of fuel extraction processing use and spent fuel storage internalized costs 21 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 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 a worldwide perspective long term waste storage costs are uncertain olkiluoto nuclear power plant in eurajoki finland the site houses of one of the most powerful reactors known as epr 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 unit 1 of the cernavodă nuclear power plant in romania in eastern europe 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 22 where cheap gas is available and its future supply relatively secure this also poses a major problem for nuclear projects 22 analysis of the economics of nuclear power must take into account who bears 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 23 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 a significantly different evaluation of the economics of new nuclear power stations 24 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 25 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 the need to spend more on redundant back up safety equipment in 2020 march nuclear power is cost competitive with other forms of electricity generation except where there is direct access to low cost fossil fuels fuel costs for nuclear plants are a minor proportion of total generating costs though capital costs are greater than those for coal fired plants and much greater than those for gas fired plants system costs for nuclear power as well as coal and gas fired generation are very much lower than for intermittent renewables providing incentives for long term high capital investment in deregulated markets driven by short term price signals presents a challenge in securing a diversified and reliable electricity supply system in assessing the economics of nuclear power decommissioning and waste disposal costs are fully taken into account nuclear power plant construction is typical of large infrastructure projects around the world whose costs and delivery challenges tend to be under estimated 26 safety and accidents edit hypothetical number of global deaths which would have resulted from energy production if the world s energy production was met through a single source in 2014 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 a small enough volume to go 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 27 the most serious accidents to date have been 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 28 an interdisciplinary team from mit has estimated that given the expected growth of nuclear power from 2005 to 2055 at least four serious nuclear accidents would be expected in that period 29 the mit study does not take into account improvements in safety since 1970 30 31 controversy edit the ukrainian city of pripyat abandoned due to a nuclear accident which took place at chernobyl nuclear power plant on 26 april 1986 seen in the background the nuclear power debate about the deployment and use of nuclear fission reactors to generate electricity from nuclear fuel for civilian purposes peaked during the 1970s and 1980s when it reached an intensity unprecedented in the history of technology controversies in some countries 32 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 33 full citation needed proponents advance the notion that nuclear power produces virtually no air pollution in contrast to 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 34 full citation needed opponents say that nuclear power poses many threats to people and the environment who weasel words 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 unsolved problem of radioactive nuclear waste 35 36 37 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 38 39 critics do not believe that these risks can be reduced through new technology 40 despite rapid advancements in containment procedures and storage methods opponents argue that when all 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 41 42 43 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 citation needed on 1 august 2020 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 the environment and raising the possibility of nuclear proliferation 44 reprocessing edit nuclear reprocessing technology was developed to chemically separate and recover fissionable plutonium from irradiated nuclear fuel 45 reprocessing serves multiple purposes whose relative importance has changed over time originally reprocessing was used solely to extract plutonium for producing nuclear weapons with the commercialization of nuclear power the reprocessed plutonium was recycled back into mox nuclear fuel for thermal reactors 46 the reprocessed uranium which constitutes the bulk of the spent fuel material can in principle also be re used as fuel but that is only economic when uranium prices are high or disposal is expensive finally the breeder reactor can employ not only the recycled plutonium and uranium in spent fuel but all the actinides closing the nuclear fuel cycle and potentially multiplying the energy extracted from natural uranium by more than 60 times 47 nuclear reprocessing reduces the volume of high level waste but by itself does not reduce radioactivity or heat generation and therefore does not eliminate the need for a geological waste repository reprocessing has been politically controversial because of the potential to contribute to nuclear proliferation the potential vulnerability to nuclear terrorism the political challenges of repository siting a problem that applies equally to direct disposal of spent fuel and because of its high cost compared to the once through fuel cycle 48 in the united states the obama administration stepped back from president bush s plans for commercial scale reprocessing and reverted to a program focused on reprocessing related scientific research 49 accident indemnification edit 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 the brussels supplementary convention and the vienna convention on civil liability for nuclear damage 50 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 united states in the united states insurance for nuclear or radiological incidents is covered for facilities licensed through 2025 by the price anderson nuclear industries indemnity act united kingdom under the energy policy of the united kingdom through its 1965 nuclear installations act liability is governed for nuclear damage for which a uk nuclear licensee is responsible the act requires compensation to be paid for damage up to a limit of 150 million by the liable operator for ten years after the incident between ten and thirty years afterwards the government meets this obligation the government is also liable for additional limited cross border liability about 300 million under international conventions paris convention on third party liability in the field of nuclear energy and brussels convention supplementary to the paris convention 51 decommissioning edit 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 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 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 timing and deferral of decommissioning edit generally speaking nuclear stations were originally designed for a life of about 30 years 52 53 newer stations are designed for a 40 to 60 year operating life 54 the centurion reactor is a future class of nuclear reactor that is being designed to last 100 years 55 one of the major limiting wear factors is the deterioration of the reactor s pressure vessel under the action of neutron bombardment 53 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 56 flexibility edit nuclear stations are used primarily for base load because of economic considerations the fuel cost of operations for 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 57 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 58 unit a at the decommissioned german biblis nuclear power plant was designed to modulate its output 15 per minute between 40 to 100 of its nominal power 59 see also edit list of commercial nuclear reactors list of commercial nuclear power reactors grouped by country list of nuclear power stations that are larger than 1 000 mw in current net capacity footnotes edit release press new modification of russian vver 440 fuel loaded at paks npp in hungary pris home iaea org retrieved 11 january 2022 world nuclear power rea...