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Uranium Zirconium Hydride
Uranium zirconium hydride (UZrH, ), a dispersion of metallic uranium in a matrix, is used as the fuel in TRIGA reactors. UZrH fuel is used in most research reactors at universities and has a large, prompt negative fuel temperature coefficient of reactivity, meaning that as the temperature of the core increases, the reactivity rapidly decreases. Franco-Belge de Fabrication du Combustible, in Romans-sur-Isère Romans-sur-Isère (; ; Old Occitan: ''Romans'') is a Communes of France, commune in the Drôme Departments of France, department in southeastern France. Geography Romans-sur-Isère is located on the Isère (river), Isère, northeast of Valence, ..., France, is the only manufacturer of this fuel. References External links Technical Foundations of TRIGA: Thermalization In Zirconium Hydride {{DEFAULTSORT:Uranium zirconium hydride [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uranium
Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactive decay, radioactively decays, usually by emitting an alpha particle. The half-life of this decay varies between 159,200 and 4.5 billion years for different isotopes of uranium, isotopes, making them useful for dating the age of the Earth. The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and uranium-235 (which has 143 neutrons). Uranium has the highest atomic weight of the primordial nuclide, primordially occurring elements. Its density is about 70% higher than that of lead and slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few Parts-per notation#Parts-per expressions, parts per million in soil, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRIGA
TRIGA (Training, Research, Isotopes, General Atomics) is a class of nuclear research reactor designed and manufactured by General Atomics. The design team for TRIGA, which included Edward Teller, was led by the physicist Freeman Dyson. Design TRIGA is a swimming pool reactor that can be installed without a containment building, and is designed for research and testing use by scientific institutions and universities for purposes such as undergraduate and graduate education, private commercial research, non-destructive testing and isotope production. The TRIGA reactor uses uranium zirconium hydride (UZrH) fuel, which has a large, prompt negative fuel temperature coefficient of reactivity, meaning that as the temperature of the core increases, the reactivity rapidly decreases. Because of this unique feature, it has been safely pulsed at a power of up to 22,000 megawatts. The hydrogen in the fuel is bound in the uranium zirconium hydride crystal structure with a vibrational energ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuel Temperature Coefficient Of Reactivity
Fuel temperature coefficient of reactivity is the change in reactivity of the nuclear fuel per degree change in the fuel temperature. The coefficient quantifies the amount of neutrons that the nuclear fuel (such as uranium-238) absorbs from the fission process as the fuel temperature increases. It is a measure of the stability of the reactor operations. This coefficient is also known as the Doppler coefficient due to the contribution of Doppler broadening, which is the dominant effect in thermal systems. Contributing effects Doppler broadening Increased thermal motion of atoms within the fuel results in a broadening of resonance capture cross-section peaks, resulting in an increased neutron capture rate in the non-fissile portions of the fuel, resulting in an overall reduction of neutron flux.https://www.nuclear-power.com/glossary/doppler-broadening/ Thermal expansion Thermal expansion of the fuel at higher temperatures results in a lower density which reduces the likeliho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franco-Belge De Fabrication Du Combustible
FBFC (''Franco-Belge de Fabrication du Combustible'', French-Belgian fabrication of fuel) is a nuclear fuel producing company. From 1977 onwards its headquarters are located in Romans-sur-Isère. It operates a further two facilities, one at the Tricastin Nuclear Power Center in France and one Dessel in Belgium. In 2001 FBFC became a wholly owned subsidiary of Areva. Since 2018, FBFC is a subsidiary of Framatome. In Dessel FBFC employs around 150 people. It is the only manufacturer of uranium zirconium hydride fuel in the world, a material used in TRIGA TRIGA (Training, Research, Isotopes, General Atomics) is a class of nuclear research reactor designed and manufactured by General Atomics. The design team for TRIGA, which included Edward Teller, was led by the physicist Freeman Dyson. Design ... reactors. References {{Reflist Areva Nuclear fuel companies Nuclear technology in Belgium Nuclear technology companies of France 2001 mergers and acquisitions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Romans-sur-Isère
Romans-sur-Isère (; ; Old Occitan: ''Romans'') is a Communes of France, commune in the Drôme Departments of France, department in southeastern France. Geography Romans-sur-Isère is located on the Isère (river), Isère, northeast of Valence, Drôme, Valence. There are more than 50,000 inhabitants in the urban area (if the neighboring town of Bourg-de-Péage is included). Romans is close to the Vercors Plateau, Vercors. Population Economy * Nuclear fuel manufacture (FBFC, Franco-Belge de Fabrication du Combustible), Framatome subsidiary. * Shoe manufacture (including Robert Clergerie) History *Historian Emmanuel Le Roy Ladurie wrote ''Carnaval de Romans'' (1980) a microhistory, microhistorical study, based on the only two surviving eyewitness accounts, of the 1580 massacre of about twenty artisans at the annual carnival in the town. He treats the massacre as a microcosm of the political, social and religious conflicts of rural society in the latter half of the 16th century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Fuels
Nuclear fuel refers to any substance, typically fissile material, which is used by nuclear power stations or other nuclear devices to generate energy. Oxide fuel For fission reactors, the fuel (typically based on uranium) is usually based on the metal oxide; the oxides are used rather than the metals themselves because the oxide melting point is much higher than that of the metal and because it cannot burn, being already in the oxidized state. Uranium dioxide Uranium dioxide is a black semiconducting solid. It can be made by heating uranyl nitrate to form . : This is then converted by heating with hydrogen to form UO2. It can be made from enriched uranium hexafluoride by reacting with ammonia to form a solid called ammonium diuranate, . This is then heated ( calcined) to form and U3O8 which is then converted by heating with hydrogen or ammonia to form UO2. The UO2 is mixed with an organic binder and pressed into pellets. The pellets are then fired at a much higher te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Materials
Nuclear material refers to the metals uranium, plutonium, and thorium, in any form, according to the IAEA. This is differentiated further into "source material", consisting of natural and depleted uranium, and "special fissionable material", consisting of enriched uranium ( U-235), uranium-233, and plutonium-239. Uranium ore concentrates are considered to be a "source material", although these are not subject to safeguards under the Nuclear Non-Proliferation Treaty. According to the Nuclear Regulatory Commission(NRC), there are four different types of regulated nuclear materials: special nuclear material, source material, byproduct material and radium. Special nuclear materials have plutonium, uranium-233 or uranium with U233 or U235 that has a content found more than in nature. Source material is thorium or uranium that has a U235 content equal to or less than what is in nature. Byproduct material is radioactive material that is not source or special nuclear material. It ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
