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Research Reactors
Research reactors are nuclear fission-based nuclear reactors that serve primarily as a neutron source. They are also called non-power reactors, in contrast to power reactors that are used for electricity production, heat generation, or maritime propulsion. Purpose The neutrons produced by a research reactor are used for neutron scattering, non-destructive testing, analysis and testing of materials, production of radioisotopes, research and public outreach and education. Research reactors that produce radioisotopes for medical or industrial use are sometimes called isotope reactors. Reactors that are optimised for beamline experiments nowadays compete with spallation sources. Technical aspects Research reactors are simpler than power reactors and operate at lower temperatures. They need far less fuel, and far less fission products build up as the fuel is used. On the other hand, their fuel requires more highly enriched uranium, typically up to 20% U-235, although some use 93% ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Neutron Moderator
In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, ideally without capturing any, leaving them as thermal neutrons with only minimal (thermal) kinetic energy. These thermal neutrons are immensely more susceptible than fast neutrons to propagate a nuclear chain reaction of uranium-235 or other fissile isotope by colliding with their atomic nucleus. Water (sometimes called "light water" in this context) is the most commonly used moderator (roughly 75% of the world's reactors). Solid graphite (20% of reactors) and heavy water (5% of reactors) are the main alternatives. Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility. Moderation Neutrons are normally bound into an atomic nucleus and do not exist free for long in nature. The unbound neutron has a half-life of 10 minutes and 11 seconds. The release of neutrons from the nucleus requires exceeding the binding ener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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AREVA
Areva S.A. was a French multinational group specializing in nuclear power, active between 2001 and 2018. It was headquartered in Courbevoie, France. Before its 2016 corporate restructuring, Areva was majority-owned by the French state through the French Alternative Energies and Atomic Energy Commission (54.37%), Banque publique d'investissement (3.32%), and Agence des participations de l'État (28.83%). Électricité de France, in which the French government has a majority ownership stake, owned 2.24%; the Kuwait Investment Authority owned 4.82% as the second largest shareholder after the French state. As a part of the restructuring program following its insolvency, Areva sold or discontinued its renewable energy businesses and sold its reactors subsidiary Areva NP (which has reverted to its original name, Framatome) to EDF. Its nuclear propulsion and research reactors subsidiary Areva TA (now TechnicAtome) was sold to the Agence des participations de l'État and its nu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Siemens
Siemens AG ( ) is a German multinational technology conglomerate. It is focused on industrial automation, building automation, rail transport and health technology. Siemens is the largest engineering company in Europe, and holds the position of global market leader in industrial automation and industrial software. The origins of the conglomerate can be traced back to 1847 to the ''Telegraphen Bau-Anstalt von Siemens & Halske'' established in Berlin by Werner von Siemens and Johann Georg Halske. In 1966, the present-day corporation emerged from the merger of three companies: Siemens & Halske, Siemens-Schuckert, and Siemens-Reiniger-Werke. Today headquartered in Munich and Berlin, Siemens and its subsidiaries employ approximately 320,000 people worldwide and reported a global revenue of around €78 billion in 2023. The company is a component of the DAX and Euro Stoxx 50 stock market indices. As of December 2023, Siemens is the second largest German company by market ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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INVAP
INVAP S.E. is an Argentine company that provides design, integration, construction and delivery of equipment, plants and devices. The company operates in North America, Europe, Asia Pacific, Latin America, the Middle East and Africa, and delivers projects for nuclear, aerospace, chemical, medical, petroleum and governmental sectors. The company is an unlisted private company, the sole owner being the Province of Río Negro. Its headquarters is in San Carlos de Bariloche. As of 2023, INVAP employs some 1,700 employees, 80% of which are professionals and specialists in their field of expertise. In 2018 the company was avowed as the most important business from Argentina, winning the Diamond Konex Award. Background INVAP was created on September 1, 1976, as a spin-off of the Argentine Atomic Energy Commission, research laboratories division. The name INVAP is a portmanteau of the words ''inv''estigación ''ap''licada ("applied research" in Spanish). Satellites INVAP was th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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AECL
Atomic Energy of Canada Limited (AECL, Énergie atomique du Canada limitée, EACL) is a Canadian Crown corporation and the largest nuclear science and technology laboratory in Canada. AECL developed the CANDU reactor technology starting in the 1950s, and in October 2011 licensed this technology to Candu Energy. AECL describes its goal as ensuring that "Canadians and the world receive energy, environmental and economic benefits from nuclear science and technology – with confidence that nuclear safety and security are assured". Until October 2011, AECL was also the vendor of CANDU technology, which it had exported worldwide. Throughout the 1960s–2000s AECL marketed and built CANDU facilities in India, South Korea, Argentina, Romania, and the People's Republic of China. It is a member of the World Nuclear Association trade group. In addition, AECL manufactures nuclear medicine radioisotopes for supply to Nordion in Ottawa, Ontario, and is the world's largest supplier of m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Open-pool Australian Lightwater Reactor
The Open-pool Australian lightwater reactor (OPAL) is a 20 megawatt (MW) swimming pool reactor, swimming pool nuclear research reactor. Officially opened in April 2007, it replaced the High Flux Australian Reactor as Australia's only nuclear reactor, and is located at the Australian Nuclear Science and Technology Organisation (ANSTO) Research Establishment in Lucas Heights, New South Wales, a suburb of Sydney. Both OPAL and its predecessor have been known simply as the Lucas Heights reactor. Uses The main reactor uses are: * Irradiation of target materials to produce Radionuclide, radioisotopes for medical and industrial applications * Research in the fields of materials science and structural biology using neutron beams and its sophisticated suite of experimental equipment * Analysis of minerals and samples using the Neutron activation analysis, neutron activation technique and the delay neutron activation technique * Irradiation of Boule (crystal), silicon ingots in order ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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ANSTO
The Australian Nuclear Science and Technology Organisation (ANSTO) is a statutory body of the Australian Government that is responsible for nuclear research and the production of radioisotopes for nuclear medicine. It was established in April 1987 to replace the former Australian Atomic Energy Commission (AAEC), which was founded in 1952. Its headquarters and main research facilities are on the southern outskirts of Sydney in Lucas Heights, Sutherland Shire. Purpose The Australian Nuclear Science and Technology Organisation Act 1987 (Cth) prescribes its general purpose. Mission statement * To support the development and implementation of government policies and initiatives in nuclear and related areas, domestically and internationally * To operate nuclear science and technology based facilities, for the benefit of industry and the Australian and international research community * To undertake research that will advance the application of nuclear science and technology * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Neutron Flux
The neutron flux is a scalar quantity used in nuclear physics and nuclear reactor physics. It is the total distance travelled by all free neutrons per unit time and volume. Equivalently, it can be defined as the number of neutrons travelling through a small sphere of radius R in a time interval, divided by a maximal cross section of the sphere (the great disk area, \pi R^2) and by the duration of the time interval. The dimension of neutron flux is \mathsf^\mathsf^ and the usual unit is cm−2s−1 (reciprocal square centimetre times reciprocal second). The neutron fluence is defined as the neutron flux integrated over a certain time period. So its dimension is \mathsf^ and its usual unit is cm−2 (reciprocal square centimetre). An older term used instead of cm−2 was "n.v.t." (neutrons, velocity, time). Natural neutron flux Neutron flux in asymptotic giant branch stars and in supernovae is responsible for most of the natural nucleosynthesis producing elements heavier th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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National Academies Of Sciences, Engineering, And Medicine
The National Academies of Sciences, Engineering, and Medicine (NASEM), also known as the National Academies, is a Congressional charter, congressionally chartered organization that serves as the collective scientific national academy of the United States. The name is used interchangeably in two senses: (1) as an umbrella term or parent organization for its three sub-divisions that operate as quasi-independent honorific learned society member organizations known as the National Academy of Sciences (NAS), the National Academy of Engineering (NAE), and the National Academy of Medicine (NAM); and (2) as the brand for studies and reports issued by the unified operating arm of the three academies originally known as the National Research Council (NRC). The National Academies also serve as public policy advisors, research institutes, think tanks, and public administration consultants on issues of public importance or on request by the government. The National Research Council, National ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Spent Nuclear Fuel
Spent nuclear fuel, occasionally called used nuclear fuel, is nuclear fuel that has been irradiated in a nuclear reactor (usually at a nuclear power plant). It is no longer useful in sustaining a nuclear reaction in an ordinary thermal reactor and, depending on its point along the nuclear fuel cycle, it will have different isotopic constituents than when it started. Nuclear fuel rods become progressively more radioactive (and less thermally useful) due to neutron activation as they are fissioned, or "burnt", in the reactor. A fresh rod of low enriched uranium pellets (which can be safely handled with gloved hands) will become a highly lethal gamma emitter after 1–2 years of core irradiation, unsafe to approach unless under many feet of water shielding. This makes their invariable accumulation and safe temporary storage in spent fuel pools a prime source of high level radioactive waste and a major ongoing issue for future permanent disposal. Nature of spent fuel Nanomaterial pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |