Development of Hydride Neutron Absorber

摘要

Hydride neutron absorbers have been proposed to be used in Fast Breeder Reactor. Demonstration of pellet fabrication have been successfully done. Irradiation behavior of hydride materials were tested in the fast experimental reactor, JOYO. A metal-hydride has very high hydrogen atom density, which is equivalent to that of liquid water. Fast neutrons in nuclear reactors are efficiently moderated and are absorbed in the metal-hydride. The Hf hydride and Zr-Gd hydride are considered as neutron absorber in FBR (Fast Breeder Reactor).