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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Latest News
The U.S. Million Person Study of Low-Dose-Rate Health Effects
There is a critical knowledge gap regarding the health consequences of exposure to radiation received gradually over time. While there is a plethora of studies on the risks of adverse outcomes from both acute and high-dose exposures, including the landmark study of atomic bomb survivors, these are not characteristic of the chronic exposure to low-dose radiation encountered in occupational and public settings. In addition, smaller cohorts have limited numbers leading to reduced statistical power.
E. W. Sucov, F. S. Malick, L. Green
Fusion Science and Technology | Volume 4 | Number 2 | September 1983 | Pages 1084-1088
Blanket and First Wall Engineering | doi.org/10.13182/FST83-A23002
Articles are hosted by Taylor and Francis Online.
A fluidized bed concept for blankets of dry or wetted first wall ICF reactors using solid lithium compounds is described. The reaction chamber is a right cylinder, 32 m high and 20 m in diameter; the blanket is composed of 36 steel tanks, 32m high, which carry the sintered Li2O particles in the fluidizing helium gas. Each tank has a radial thickness of 2 m which generates a tritium breeding ratio (TBR) of 1.27 and absorbs over 98% of the neutron energy; reducing the thickness to 1.2 m produces a TBR of 1.2 and energy absorption of 97% which satisfy the design goals. Calculations of tritium diffusion through the grains and heat removal from the grains showed that neither could be removed by the carrier gas; tritium and heat are therefore removed by removing the grains continuously. The particles are continuously fed into the bottom of the tanks at 300°C and removed at the top at 475°C. Tritium and heat extraction are easily and conveniently done outside the reactor. Compared to blanket designs which use flowing liquid metals or packed beds of solid lithium compounds, this concept is safer, simpler, cheaper, easier to maintain and less likely to break down. In addition, this concept is compatible with both wetted wall and dry wall first wall designs. Finally, deleterious thermal expansion effects due to absorption of the neutron pulse in liquid lithium or the packed bed disappear because of the decoupling of the particles in the helium stream.