A nuclear power plant or nuclear power station is a thermal power station in which the heat source is a nuclear reactor. As is typical in all conventional thermal power stations the heat is used to generate steam which drives a steam turbine connected to an electric generator which produces electricity. As of 23 April 2014[update], the IAEA report there are 449 nuclear power reactors in operation operating in 31 countries.
Nuclear plants are usually considered to be base load stations since fuel is a small part of the cost of production. Their operations and maintenance (O&M) and fuel costs are, along with hydropower stations, at the low end of the spectrum and make them suitable as base-load power suppliers. The cost of spent fuel management, however, is somewhat uncertain.
Main articles: Nuclear reactor § Early reactors, History of nuclear power, and Nuclear fission § History
Electricity was generated by a nuclear reactor for the first time ever on September 3, 1948 at the X-10 Graphite Reactor in Oak Ridge, Tennessee in the United States, which was the first nuclear power station to power a light bulb. The second, larger experiment occurred on December 20, 1951 at the EBR-I experimental station near Arco, Idaho in the United States. On June 27, 1954, the world's first nuclear power station to generate electricity for a power grid started operations at the Soviet city of Obninsk. The world's first full scale power station, Calder Hall in England, opened on October 17, 1956. The world's first full scale power station solely devoted to electricity production (Calder Hall was also meant to produce plutonium), Shippingport power plant in the United States, 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 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 vapour is condensed in 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.
Main article: Nuclear reactor
The nuclear reactor is the heart of the station. In its central part, the reactor core's heat is generated by controlled nuclear fission. With this heat, a coolant is heated as it is pumped through the reactor and thereby removes the energy from the reactor. Heat from nuclear fission is used to raise steam, which runs through turbines, which in turn powers 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 is found in two different isotopes: uranium-238 (U-238), accounting for 99.3% and uranium-235 (U-235) accounting for about 0.7%. Isotopes are atoms of the same element with a different number of neutrons. Thus, U-238 has 146 neutrons and U-235 has 143 neutrons. Different isotopes have different behaviours. 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 the same element. Different isotopes also have different half-lives. A half-life is the amount of time it takes for half of a sample of a radioactive element to decay. 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 the environment. In addition, many reactors are equipped with a dome of concrete to protect the reactor against both internal casualties and external impacts.
Main article: Steam turbine
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 so aligned to prevent debris from 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 the steam turbine, so the turbine is kept as part of the radiologically controlled area of the nuclear power station.
Main article: Electric generator
The 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 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 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 tube-and-shell 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 subcooled liquid water so it can be pumped back to the reactor by the condensate and feedwater pumps. This condensing process is accomplished by allowing the wet vapor turbine exhaust to come into contact with thousands of tubes that have much colder water flowing through them on the other side. The cooling water will typically come from a natural body of water such as a river or lake. Palo Verde Nuclear Generating Station, located in the desert about 60 miles west of Phoenix, Arizona, is the only nuclear facility that does not use a natural body of water for cooling, instead using treated sewage from the greater Phoenix metropolitan area. The cross-flow aspect of a typical main condenser means the two fluids that are exchanging heat, turbine exhaust and the cold water from a river or other water source, are flowing in perpendicular directions. This is extremely effective at allowing for phase separation, that is, the heavier, condensed water falls off of the condenser tubes into the condenser hotwell found at the bottom of the heat exchanger and awaits its turn to be pumped. 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 the steam generator and 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).
Emergency power supply
Most nuclear stations require two distinct sources of offsite power feeding station service transformers that are sufficiently separated in the station's switchyard and can receive power from multiple transmission lines. In addition in some nuclear stations the turbine generator can power the station's house loads while the station is online via station service transformers which tap power from the generator output bus bars before they reach the step-up transformer (these stations also have station service transformers that receive offsite power directly from the switch yard). Even with the redundancy of two power sources total loss of offsite power is still possible. Nuclear power stations are equipped with emergency power.
Workers in a nuclear power station
In the United States and Canada, workers except for management, professional (such as engineers) and security personnel are likely to be members of either the International Brotherhood of Electrical Workers (IBEW) or the Utility Workers Union of America (UWUA), or one of the various trades and labor unions representing Machinist, laborers, boilermakers, millwrights, iron workers etc.
Main article: Economics of new nuclear power plants
The economics of new nuclear power stations 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. 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/"nuclear waste" could potentially be recycled by using future reactors, generation IV reactors are being designed to completely close the nuclear fuel cycle. Presently, however there has not yet 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 waste repository construction problems. Only Finland has stable repository plans, therefore from a worldwide perspective, long-term waste storage costs are uncertain.
On the other hand, construction, or capital cost aside, measures to mitigateglobal 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 futuristic Generation IV reactors promise 10000-30000% greater fuel efficiency and the elimination of nuclear waste.
In Eastern Europe, a number of long-established projects are struggling to find finance, notably Belene in Bulgaria and the additional reactors at Cernavoda 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 the risks of future uncertainties. To date all operating nuclear power stations were developed by state-owned or regulatedutility monopolies 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 a significantly different evaluation of the economics of new nuclear power stations.
Following the 2011 Fukushima I nuclear accidents, 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, this largely eliminates the necessity to spend more on redundant back up safety equipment.
Safety and accidents
Main articles: Nuclear safety and security and § Nuclear power plant safety and security
In his book, Normal accidents, Charles Perrow says 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 the expected growth of nuclear power from 2005 – 2055, at least four serious nuclear accidents would be expected in that period. However the MIT study does not take into account improvements in safety since 1970. To date, there have been five serious accidents (core damage) in the world since 1970 (one at Three Mile Island in 1979; one at Chernobyl in 1986; and three at Fukushima-Daiichi in 2011), corresponding to the beginning of the operation of generation II reactors. This leads to on average one serious accident happening every eight years worldwide.
Modern nuclear reactor designs have had numerous safety improvements since the first generation nuclear reactors. Nuclear power plants cannot explode like a nuclear bomb 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 (for example to make a dirty bomb) and attack by enemy military (which has occurred) planes or missiles, or planes hijacked by terrorists.
Main article: Nuclear power debate
The nuclear power debate is about the controversy which has surrounded the deployment and use of nuclear fission reactors to generate electricity from nuclear fuel for civilian purposes. The debate about nuclear power peaked during 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 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 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 unsolved 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. They 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. 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 do not have a clear time limit.
Main article: Nuclear reprocessing
Nuclear reprocessing technology was developed to chemically separate and recover fissionable plutonium from irradiated nuclear fuel. 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. 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.
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. 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.
The Vienna Convention on Civil Liability for Nuclear Damage puts in place an international framework for nuclear liability. 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.
In the U.S., insurance for nuclear or radiological incidents is covered (for facilities licensed through 2025) by the Price-Anderson Nuclear Industries Indemnity Act.
Under the Energy policy of the United Kingdom through its Nuclear Installations Act of 1965, 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).
Main article: Nuclear decommissioning
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.
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 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.
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.
Main article: Nuclear power accidents by country
This section needs expansion. You can help by adding to it.(November 2017)
The Chernobyl disaster occurred in April 1986, it is considered the worst nuclear accident in history. An experiment was being carried out on one of the reactors in the plant. The purpose of the experiment was to find out the reactor's safety in the event of the failure of the main electricity supply to the plant. Right after the experiment began there was a steam explosion which exposed the reactor's graphite moderator to air, which caused it to ignite. The resulting fire sent highly radioactive plumes of smoke into the atmosphere for about ten days. The radioactive plume spread over large areas of Europe. Approximately 350,000 people were evacuated from the 3200 kilometers squared exclusion zone. The accident caused 31 direct deaths from the explosion and radiation poisoning, and several more deaths in the population exposed to high radiation doses.
The nuclear industry says that new technology and oversight have made nuclear station much safer, but 57 small accidents have occurred since the Chernobyl disaster in 1986 until 2008. Two thirds of these mishaps occurred in the US. The French Atomic Energy Agency (CEA) has concluded that technical innovation cannot eliminate the risk of human errors in nuclear station operation.
According to Benjamin Sovacool, an interdisciplinary team from MIT in 2003 estimated that given the expected growth of nuclear power from 2005 – 2055, at least four serious nuclear accidents would be expected in that period. However the MIT study does not take into account improvements in safety since 1970.
Flexibility of nuclear power stations
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. There is no cost saving if you run a nuclear station at less than full capacity.
However, nuclear stations 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 the German Biblis Nuclear Power Plant is designed to in- and decrease its output 15% per minute between 40 and 100% of its nominal power. Boiling water reactors normally have load-following capability, implemented by varying the recirculation water flow.
Future power stations
A new generation of designs for nuclear power stations, known as the Generation IV reactors, are the subject of active research. Many of these new designs specifically attempt to make fission reactors cleaner, safer and/or less of a risk to the proliferation of nuclear weapons. Passively safe stations (such as the ESBWR) are available to be built and other reactors that are designed to be nearly fool-proof are being pursued.Fusion reactors, which are still in the early stages of development, diminish or eliminate some of the risks associated with nuclear fission.
Two 1600 MWeEuropean Pressurized Reactors (EPRs) are being built in Europe, and two are being built in China. The reactors are a joint effort of French AREVA and German Siemens AG, and will be the largest reactors in the world. One EPR is in Olkiluoto, Finland, as part of the Olkiluoto Nuclear Power Plant. The reactor was originally scheduled to go online in 2009, but has been repeatedly delayed, and as of September 2014 has been pushed back to 2018. Preparatory work for the EPR at the Flamanville Nuclear Power Plant in Flamanville, Manche, France was started in 2006, with a scheduled completion date of 2012. The French reactor has also been delayed, and was projected, in 2013, to launch in 2016. The two Chinese EPRs are part of the Taishan Nuclear Power Plant in Taishan, Guangdong. The Taishan reactors were scheduled to go online in 2014 and 2015, but that has been delayed to 2017.
As of March 2007[update], there are seven nuclear power stations under construction in India, and five in China.
In November 2011 Gulf Power stated that by the end of 2012 it hopes to finish buying off 4000 acres of land north of Pensacola, Florida in order to build a possible nuclear power station.
In 2010 Russia launched a floating nuclear power station. The £100 million vessel, the Akademik Lomonosov, is the first of seven stations that will bring vital energy resources to remote Russian regions.
By 2025, Southeast Asia nations plan to have a total of 29 nuclear power stations: Indonesia will have 4 nuclear power stations, Malaysia 4, Thailand 5 and Vietnam 16 from nothing at all in 2011.
In 2013 China had 32 nuclear reactors under construction, the highest number in the world.
Expansion at two nuclear power stations in the United States, Vogtle and V. C. Summer Nuclear Power Station, located in Georgia and South Carolina, respectively, were scheduled to be completed between 2016 and 2019. The construction of the two South Carolina reactors have been abandoned due to cost overruns and the bankruptcy of Westinghouse Electric Company (who designed and was building the reactors) in March 2017. The two new Vogtle reactors, and the two new reactors at Virgil C. Summer Nuclear Station, represented the first nuclear power construction projects in the United States since the Three Mile Island nuclear accident in 1979.
The UK government has given the go-ahead for the Hinkley Point C nuclear power station.
Several countries have begun thorium-based nuclear power programs. Thorium is four times more abundant in the earth's crust than uranium. Over 60% of thorium's ore monazite is found in five countries: Australia, the United States, India, Brazil, and Norway. These thorium resources are enough to power current energy needs for thousands of years. The thorium fuel cycle is able to generate nuclear energy with a lower output of radiotoxic waste than the uranium fuel cycle.
- ^"PRIS - Home". Iaea.org. Retrieved 2015-11-01.
- ^"World Nuclear Power Reactors 2007-08 and Uranium Requirements". World Nuclear Association. 2008-06-09. Archived from the original on March 3, 2008. Retrieved 2008-06-21.
- ^"Nuclear Power Economics - Nuclear Energy Costs - World Nuclear Association". www.world-nuclear.org.
- ^"Graphite Reactor". 31 October 2013. Archived from the original on 2 November 2013.
- ^"Graphite Reactor Photo Gallery". 31 October 2013.
- ^"First Atomic Power Plant at X-10 Graphite Reactor". 31 October 2013.
- ^"Russia's Nuclear Fuel Cycle". world-nuclear.org. Retrieved 1 November 2015.
- ^"Queen switches on nuclear power". BBC Online. 17 October 2008. Retrieved 1 April 2012.
- ^William, Kaspar et al. (2013). A Review of the Effects of Radiation on Microstructure and Properties of Concretes Used in Nuclear Power Plants. Washington, D.C.: Nuclear Regulatory Commission, Office of Nuclear Regulatory Research.
- ^"How nuclear power works". HowStuffWorks.com. Retrieved September 25, 2008.
- ^"Nuclear Regulatory Commission Library - Main Condenser".
- ^"Cooling Power Plants | Power Plant Water Use for Cooling - World Nuclear Association". www.world-nuclear.org. Retrieved 2017-09-27.
- ^"the largest nuclear generating facility in the world".
- ^ abKidd, Steve (January 21, 2011). "New reactors—more or less?". Nuclear Engineering International. Archived from the original on December 12, 2011.
- ^Ed Crooks (12 September 2010). "Nuclear: New dawn now seems limited to the east". Financial Times. Retrieved 12 September 2010.
- ^The Future of Nuclear Power. Massachusetts Institute of Technology. 2003. ISBN 0-615-12420-8. Retrieved 2006-11-10.
- ^Massachusetts Institute of Technology (2011). "The Future of the Nuclear Fuel Cycle"(PDF). p. xv.
- ^Daniel E Whitney (2003). "Normal Accidents by Charles Perrow"(PDF). Massachusetts Institute of Technology.
- ^ abcBenjamin K. Sovacool (January 2011). "Second Thoughts About Nuclear Power"(PDF). National University of Singapore. p. 8. Archived from the original(PDF) on 2013-01-16.
- ^Massachusetts Institute of Technology (2003). "The Future of Nuclear Power"(PDF). p. 48.
- ^ abhttp://www.uvm.edu/~vlrs/Energy/NuclearPower.pdf
- ^ abMassachusetts Institute of Technology (2003). "The Future of Nuclear Power"(PDF). p. 49.
- ^"Legal Experts: Stuxnet Attack on Iran Was Illegal 'Act of Force'". Wired. 25 March 2013.
- ^MacKenzie, James J (1977). "The Nuclear Power Controversy. Arthur W. Murphy". The Quarterly Review of Biology. 52 (4): 467–8. doi:10.1086/410301. JSTOR 2823429.
- ^Walker, J. Samuel (10 January 2006). Three Mile Island: A Nuclear Crisis in Historical Perspective. University of California Press. pp. 10–11. ISBN 978-0-520-24683-6.
- ^In February 2010 the nuclear power debate played out on the pages of the New York Times, see A Reasonable Bet on Nuclear Power and Revisiting Nuclear Power: A Debate and A Comeback for Nuclear Power?
- ^In July 2010 the nuclear power debate again played out on the pages of the New York Times, see We’re Not ReadyNuclear Energy: The Safety Issues
- ^Kitschelt, Herbert P (2009). "Political Opportunity Structures and Political Protest: Anti-Nuclear Movements in Four Democracies". British Journal of Political Science. 16 (1): 57–85. doi:10.1017/S000712340000380X. JSTOR 193981.
Nuclear energy is a comparatively new source of energy. The first nuclear power plant was commissioned in June 1954 in Obninsk, Russia. Fossil fuels offer a limited source of energy, as they are non-renewable. Eventually these supplies will cease, this is predicted to be in the next few decades. An estimate based on fuel consumption in America, predicts as early as 2020 there will be no fossil fuels left.
The energy used by the whole world is approximated to be the coal equivalent to 2790 Gigatons per year. Fossil fuels reserves total for the world in 1980 had approximately 8685 Gigatons of coal and 91.2 Gigatons of oil. This is why extensive research has gone into looking for new sources of energy to keep things powered.
Energy sources currently being used are hydroelectricity, wind turbines, solar power, fossil fuels and nuclear power, and now also hydrogen fuel cells. There is much controversy over the health and safety issues of using nuclear power, especially after Three Mile Island and the Chernobyl disasters.
Where does the energy come from?
The nucleus is the centre of the atom which is normally made up of the same number of protons as it has neutrons. However, some very large nuclei in certain isotopes have an imbalance. They can often be found with too many neutrons, and this imbalance will result in the nucleus becoming unstable.
Uranium-235 is a radioactive substance which due to its large size and unstable state can undergo induced fission. Its nucleus can be split into smaller atoms when induced by a neutron. This process will release two or three neutrons, depending on how the atom splits. These new neutrons can then initiate the decomposition of the nuclei of other atoms of Uranium. Propagation by the chain reaction releases more neutrons and causes further nuclear splits.
Under controlled conditions, the rate of this chain reaction can be kept at a constant rate. This produces high temperatures but is not allowed to react out of control as in a nuclear bomb. The heat produced is used to turn water into steam, the steam then turns a turbine and generator, creating electricity.
In a reactor the uranium source required is 3-4% Uranium-235. Therefore it is necessary to enrich natural Uranium to use for nuclear power. This is done by converting uranium oxide extracted from ore into gaseous form, uranium hexafluoride. From this form it can be enriched from its natural proportion of 0.7% uranium-235 to 3-4%, this is done by separation of isotopes. A higher enrichment means better efficiency, and ordinary water can then be used as a moderator.
The form of uranium usually used is pellet form, these are arranged into rods and then to bundles. These bundles are surrounded by a moderator such as water, graphite or heavy water. The moderator slows down the emitted neutrons by reducing their energy as they collide with the nuclei of the moderator. Control rods are placed in the bundles which control the rate of the nuclear reaction. These can also be used to shut down the reactor completely when something goes wrong.
These control rods are materials which absorb neutrons, such as Cadmium and Boron. They work by reducing the number of neutrons in the reactor and therefore slowing down the reaction and consequently reducing the heat. To reduce heat, the rods are put further into the bundles where they absorb more neutrons. To raise the heat the opposite is done, and the heat level rises.
As the atoms are split the energy is released as heat. This is used to heat water and turns it into steam. The steam drives a steam turbine, which spins a generator to produce electricity. This is what happens in a basic reactor, others include the use of intermediate heat exchangers or gaseous coolant fluid. The set up of a nuclear power plant is basically the same as that of a coal power plant. The main difference is how the water is heated to produce steam, from then on the turbines and generator work in the same way for both plants.
Efficiency of Nuclear energy
The majority, around 85%, of the energy gained from nuclear fission is the kinetic energy of the products. In solid fuel, particles can only move a very short distance. Therefore the kinetic energy is converted into heat as the particles are hitting against each other. The other 15% of the energy is gained from the Gamma rays emitted during the fission process, and from the kinetic energy of the neutrons released.
The time taken to capture and split the neutron is minute, taking only 1×10-12 seconds. The energy gained by splitting an atom comes from the fact that the products formed from the fission, together with the neutrons weigh less than the original product. The change in mass appears in the form of energy, and follows Einstein’s equation E=mc2.
The decay of a single Uranium-235 atom releases on average 200 million electron volts, the equivalent to 3.204×10-11 joules of energy. In contrast, 4 electron volts are released per molecule of carbon dioxide in the combustion of fossil fuels. To compare obtainable energy content between fossil fuels and nuclear fuel, ‘a pound of highly enriched uranium … is equal to something on the order of a million gallons of gasoline’. So it can be seen that this is a very compact source of energy.
The reason for the large amount of energy released is because the forces involved in nuclear reactions are much greater than those involved in chemical reactions. Uranium is a very dense metal at 18.95g/cm3 and the nucleus of a Uranium atom is very dense compared to the whole atom. The protons and neutrons are held very tightly together and the electrons orbiting the nucleus are comparatively far away, so this shows how the bonds involved are so much stronger.
Nuclear fission is a very efficient source of energy because of the low amounts of waste products. Combustion of fossil fuels produces waste products such as ash and toxic fumes. This reduces the amount of usable energy produced by reaction, and therefore lowers its efficiency.
Uranium is found in most rocks, at 0.000002% concentration. The Uranium found in the earths crust contains 99.3% Uranium-238 and 0.7% Uranium-235. Another possible source to extract Uranium from is seawater, the key is to find it in quantities that is economical for extraction.
Is it safe?
The reactor is contained within a concrete liner, which shields radiation. Since the Chernobyl incident, the reactor is now usually contained within a secondary containment structure made of steel. This prevents the leakage of radioactive steam in the event of an accident.
The general view on nuclear power is that it is very bad for the environment. But in reality the radioactivity released into the atmosphere by a nuclear power plant is less than that released by a coal power plant. Additionally, coal power plants also pollute that environment with carbon and sulphur. Obviously the radiation produced by the nuclear power plant is greater in volume than that produced by the coal power plant, but the radiation is contained within the reactor. The environmental issues with this containment are what happens to the radioactive waste when a nuclear power plant is shut down.
Half life and nuclear decay
In the event of a nuclear leak, the effects of radiation on the environment can be huge. This can be seen from the after effects of the Chernobyl power plant when it exploded.
In 1986, about 22% of the country was contaminated by the radiation of caesium-137. Ten to fifteen years later, 21% is still contaminated. This shows the large amount of time taken for radiation to be removed from the environment. The half-life of Uranium-235 is 700 million years, this is the time taken for half of the radioactive atoms in a sample to decay. So it can be seen that in the event of a nuclear leak, radioactive contamination causes very long term problems.
The Chernobyl Accident
The problems at the Chernobyl power plant were with reactor No. 4. Specific attributes of this reactor were that it was a light-water-cooled graphite-moderated reactor. This type of reactor has been criticised for its lack of containment structure, and large quantities of combustible graphite within its core. The accident actually occurred during a test run. The idea was to see if the turbines could produce the energy needed during a power cut, to keep coolant pumps working. Safety systems were turned off so as not to affect the test, and the reactor was reduced to 25% power capacity.
Due to a fault the power level plummeted to below 1%, so technicians began to raise the power level slowly. But a power surge occurred and the emergency shutdown, which is designed to halt the chain reactions, failed. The rising power level and temperature got out of control, causing an explosion. This blew off a 1000 tonne sealing cap, causing the radioactive fission products to be thrown up into the atmosphere. The fuel rods melted and graphite moderator set fire.
The mistake blamed for this disaster is that control rods were raised then immediately reinserted into the bundles. The inserting of control rods usually reduces the rate of the chain reaction. But in the case too many control rods were raised and replaced. This then had the reverse effect of raising power levels so fast that it caused the destruction of the reactor.
Lessons learned from disasters
In 2000, Germany decided to phase out nuclear power, and look into sources of power with less severe possible consequences on the environment. The disaster created international debate over the economics and controllability of nuclear power. In most European countries, no new research is being carried out on continuing to build nuclear power plants. Instead the research is aimed at improving safety features at existing nuclear power plants and disposal of nuclear waste. As of 1995, conversely, Asia and Eastern Europe have over 100 reactor units either planned or being constructed.
The number of nuclear power plant inspectors rose vastly after this disaster, and general safety awareness has greatly improved. New regulations on emergency procedures where also put in place.
The effects of the radiation are still affecting inhabitants of nearby countries, and are causing severe health problems amongst the young and old. At least now safety and disaster management are main issues within this industry, and hopefully this kind of event will not be allowed to happen in the future.
You can order a custom essay, term paper, research paper, thesis or dissertation on Nuclear Energy topic from our professional custom writing service which provides students with high-quality custom written papers.
5.00 avg. rating (91% score) - 1 vote
Tags: nuclear energy essay, nuclear energy research paper topics, nuclear energy research papers, sample research paper, science essays