High-level radioactive wastes generated after reprocessing spent nuclear ftiels from nuclear reactors include long-lived radioactive nuclides. Recently, the transmutation method using actinide hydride targets has been proposed to reduce the amount of actinide in nuclear wastes. One of the major R and D items to establish the transmutation method is development of the actinide hydride target, which can be stably irradiated in reactors. The actinide hydride targets tend to decompose at high temperature and increase the internal pressure of target element. The study of hydride dissociation is important for development of hydride target. The desorption of hydrogen from ThZr2Hx was studied by Thermo Gravimetry (TG) and Differential Thermal Analysis (DTA). The several major endothermic peaks were observed in DTA curve of ThZr2Hx in temperature range from 900 to 1200K. In this paper, these peaks are discussed in relation to stabilities of particular hydrogen occupying sites in crystal structure of ThZr2Hx.
- Actinide hydride
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering