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The form and location of the moderator can greatly influence the cost and safety of a reactor. Classically, moderators were precision-machined blocks of high-purity graphite [7] [8] with embedded ducting to carry away heat.
According to the patent application [5] the reactor design has some notable characteristics, that sets it apart from other reactor designs. It uses uranium hydride (UH 3) "low-enriched" to 5% uranium-235—the remainder is uranium-238—as the nuclear fuel, rather than the usual metallic uranium or uranium dioxide that composes the fuel rods of contemporary light-water reactors.
This required a very large amount of material in order to reach criticality, along with graphite used as a neutron moderator. The reactor contained 45,000 ultra-pure graphite blocks weighing 360 short tons (330 tonnes) and was fueled by 5.4 short tons (4.9 tonnes) of uranium metal and 45 short tons (41 tonnes) of uranium oxide. Unlike most ...
To improve the fuel's sensitivity to neutrons, a neutron moderator is used, in this case highly purified graphite. [2] [3] The reactors consisted of a huge cube of this material (the "pile") made up of many smaller blocks and drilled through horizontally to make a large number of fuel channels. Uranium fuel was placed in aluminium canisters and ...
Army Nuclear Power Program Reactors Name Location Reactor type Purpose Status Capacity (kW) Construction start date Operation date Closure Operator and owner SM-1: Fort Belvoir: PWR: Training and testing: Decommissioned: 2000: 8 April 1957 to 16 March 1973: United States Army: SM-1A: Fort Greely: Electricity and heat supply: Decommissioned ...
Labeled as "ex-burbs," these areas are usually 40-60 miles away from major metropolitan cities and can offer more peaceful ways of life and "affordable housing" options.
However, the AGRs have an anticipated life of a further 10 to 20 years. This is a thermal-neutron reactor design. Decommissioning costs can be high due to the large volume of the reactor core. Liquid metal fast-breeder reactor (LMFBR) [moderator: none; coolant: liquid metal] Scaled-down model of TOPAZ nuclear reactor
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