Atomic Energy Society of Japan

Cs compounds have been shown to be formed as fission product (FP) behaviors during light water reactor severe accidents (SA). Raman spectroscopy has been used to evaluate some of the Cs compounds. Raman spectroscopy provides information such as the composition, orientation, crystal structure, and crystal perfection (defects) of substances, and is particularly effective to evaluate localized areas of substances. The theoretical evaluation of Raman spectra of Cs compounds has not benn advanced. Therefore, we construct an evaluation method using DFT calculation for Raman spectra of Cs compounds. As the first step, we calculated the Raman spectra of Cs compounds that have been measured so far.