Process for producing actinide element-containing hydride fuel pellets

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a satisfactory actinoids- containing hydride fuel pellet free from crack in which an effective actinoids annihilation processing can be realized in an existing reactor. SOLUTION: This method for manufacturing an actinoids-containing hydride pellet for annihilation processing in reactor comprises manufacturing an alloy ingot composed of 20 wt% or less uranium, 50 wt% or less of actionid, and the remainder of zirconium in an arc welding furnace, cutting the ingot into a metal pellet shape having a predetermined dimension, hydrogenating the metal pellet to form a metal hydroxide. In the hydrogenation process, comprises reducing the pressure of a treatment tank containing metal pellet is reduced and hydrogen gas is introduced into the treatment tank up to 1 atmospheric pressure under a temperature condition of 800-1,000 deg.C stepwise.