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PBR technology is described and development requirements assessed. PBR systems can generate very high burst power levels using open cycle hydrogen coolant, or high continuous powers using closed cycle helium coolant.
#REACTOR 3 IN SUBLEVEL FULL#
Coolant exit temperatures are high, because of the ceramic fuel temperature capabilities, and the reactors can be ramped to full power and temperature very rapidly. Because of the very large heat transfer area in the packed beds, power densities in particle bed reactors (PBRs) are extremely high resulting in compact, lightweight systems. Hot exit gas flows out along the central channel of each element. The small diameter particle fuel is packed between concentric porous cylinders to make annular fuel elements, with the inlet coolant gas flowing inwards. Reactors based on direct cooled High Temperature Gas Cooled Reactor (HTGR) type particle fuel are described. High power density reactors based on direct cooled particle beds A FLIBE-lithium blanket is designed especially for high-power-density operation in a high-field environment, and gives an overall tritium breeding ratio of 1.05 in the slowly pumped lithium The ripple-coil system also affords dynamic control of the plasma temperature during the burn period. Heating of the dense central plasma is attained by the use of ripple-assisted injection of 120-keV D 0 beams. The modest value of toroidal beta permits a simple, modularized plasma-shaping coil system, located inside the TF coil trunk. A unique design for the Nb 3 Sn toroidal-field magnet system reduces the stress in the high-field trunk region, and allows modularization for simpler disassembly. High magnetic field (B/sub t/ = 7.4 T) and moderate elongation (b/a = 1.6) permit operation at the high density (n(0) approximately 5 x 10 14 cm -3 ) needed for ignition in a relatively small plasma, with a spatially-averaged toroidal beta of only 4%. Okabayashi, M.Ī conceptual design of a compact (R 0 = 6.0 m) high power density (average P/sub f/ = 7.7 MW/m 3 ) tokamak demonstration power reactor has been developed. International Nuclear Information System (INIS)Ĭohn, D.R. This speedy construction was costly, however: The project was initially budgeted at $35 million, but wound up costing $63 million, more than $900 million in today’s money.High-field, high-density tokamak power reactor It’s been estimated that under normal circumstances, construction should have taken four years-the Pentagon went up in just 16 months. Construction wrapped up on January 15, 1943.
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The demand for office space was so great that the first workers moved in before the complex was fully finished, and many employees found themselves working in offices without walls and travelling around the complex on wooden planks laid across open construction pits. The groundbreaking ceremony was held on September 11, 1941, and work quickly got underway, with more than 15,000 workers on site around the clock. From its opening, all facilities were open to both black and white employees, making the Pentagon, for a time, the only non-segregated building in Virginia.
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At first, Virginia authorities, determined to enforce the regulations laid out in its Jim Crow-era Separation of Races law, insisted that the facility be segregated, before finally relenting and ceding control of the Pentagon to the federal government. However, in June 1941 President Roosevelt issued Executive Order 8802, which prohibited segregation among federal employees. In an America still highly segregated by race, the Pentagon’s planners found it necessary to design the building with separate facilities for black and white employees, including “white” and “colored” cafeterias for the construction crews and 284 bathrooms, twice the number needed for the anticipated staff levels. There are twice as many bathrooms as necessary.
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1985 Lynette Woodard becomes first female Harlem Globetrotters playerĦ.