Selection of main nuclides from the viewpoint of safety assessment for near surface disposal of low-level radioactive waste generated from research, industrial and medical facilities, 3; Preliminary selection of important radionuclides contained in low-level radioactive waste generated from major research facilities

Sakai, Akihiro ; Amazawa, Hiroya; Nakata, Hisakazu ; Takahashi, Kuniaki ; Kihara, Shinji

Total radioactivity and radioactive concentration limit of nuclides in low level radioactive waste that are expected to cause relatively large dose in near surface disposal are needed to be described in the licensing application form, as so-called "main nuclides", for disposal business of LLW generated from research, industrial and medical facilities. In this report, as an example, the main nuclides were preliminarily selected out of the nuclides contained in LLW generated from main research reactors and PIE facilities in Nuclear Science Research Institute of JAEA, by use of nuclide composition ratios in the wastes and their radioactivity concentration limit of near surface disposal derived by Nuclear Safety Commission in Japan. As results of preliminary selection of main nuclides without fixed radioactive inventory in the wastes, 24, 30 and 33 nuclides were selected as main nuclides for LLW from the reactors, PIE facilities, and both facilities, respectively.