Abstract
Helium has better neutronic and chemical properties than sodium as coolant of a fast reactor. Sodium is much better from the heat transfer point of view. The use of oxide in place of metallic fuel has eased somewhat the requirements on the coolant and heat transfer in a fast reactor. With helium it is possible to achieve the same high values of plutonium specific inventory achievable with sodium, with the use of higher pressures and pumping power, larger temperature differences between fuel rod and coolant, artificial roughness on the fuel rod surfaces and a higher number of radial enrichment zones in the core.
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