Study on release and transport of aerial radioactive materials in reprocessing plant, 4; Cold test (Part 1) ARF test using mocked fuel reprocessing liquid waste

Tashiro, Shinsuke ; Matsumoto, Tetsuya; Kataoka, Osamu; Amano, Yuki ; Abe, Hitoshi ; Yamane, Yuichi  ; Yoshida, Kazuo ; Ishikawa, Jun ; Uchiyama, Gunzo ; Ueda, Yoshinori*; Fujine, Sachio*; Nojima, Yasuo*; Kodama, Takashi*; Nakano, Masanao*; Matsuoka, Shingo*

Measurements on the release ratios of aerial radioactive materials from mocked fuel reprocessing liquid waste under its boiling to dryness process were performed using labo-scaled experiments. Test sample, dissolved 27 elements into nitric acid and arranged to 2M acidity, was heated up to 300 C under the constant air ventilation. Steam, gaseous and airborne materials were collected or absorbed at the condenser, the air filter and the washing bottles. The accumulated release ratios of mocked FP elements from samples were determined using ICP-MS. From the accumulated release ratios determined from the condensed samples, the major release of Cs and Ru could be involved the release of mist and gaseous RuO, respectively. Besides, accumulated release ratios of Ru was about 10 to 1000 times higher than Cs, differed from the literature using fuel reprocessing liquid waste. Its differences could be influenced the nitrous acid, which was reduced the generation of RuO.