Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
; Fujita, Satoshi; ; Yamano, Hidemasa
International Workshop on the Safety of the Nuclear Fuel Cycle, 0 Pages, 2000/00
None
;
Nenryo Saikuru Anzensei Kokusai Wakushoppu, 0 Pages, 2000/00
None
Yoshida, Naoki; Tashiro, Shinsuke; Amano, Yuki; Yoshida, Kazuo; Yamane, Yuichi; Abe, Hitoshi
no journal, ,
After the Fukushima-Daiichi Nuclear Power Plant accident, Japan's licensing standards of the nuclear fuel cycle facilities were further strengthened and countermeasures against "severe accidents" were newly required as regulatory items. The severe accidents in the licensing standards were defined as accidents that occur under conditions beyond design-basis conditions. The "Evaporation to Dryness due to the Loss of Cooling Functions (EDLCF)" of high-level liquid waste (HLLW) was defined as one of the severe accidents for the reprocessing plant. In the EDLCF, it is assumed that radioactive materials (RM) are released to the gas phase due to evaporation and dryness of HLLW which induced by decay heat derived from fission products. The release behaviour of the RM is affected by the condition of the HLLW and the migration behaviour of RM is affected by the condition of gas phase. We have been conducted experimental studies for these behaviour of the RM. In recent years, behaviour of ruthenium (Ru) has attracted much attention in the field of EDLCF study. Existing studies have shown that Ru was released at a rate greater than other elements because it formed volatile compounds such as ruthenium tetroxide (RuO
). For the above reasons, we have been conducting studies focusing on the behaviour of Ru among the radioactive materials that could be released in the accident. In the presentation, we will report a summary of our studies about the release and migration behaviour of gaseous Ru.