Presentation Information
[1A09]Modeling radio-nuclide behavior for estimating their amount in radioactive waste of Fukushima Daiichi NPS(6) Evaluation of 137Cs contamination based on dose rate distribution in the RW/B of Unit 3
*Shunsuke Uchida1, Masao Chaki2, Hidetoshi Karasawa4, Yoshikazu Koma3, Youko Takahatake3 (1. non, 2. Institute of Applied Energy, 3. Japan Atomic Energy Agency, 4. Hachinohe Institute of Technology)
Keywords:
Fukushima Daiichi NPP,radwaste treatment,137Cs,dose rate distribution
In order to manage radioactive waste in the 1F, it is one of the essential subjects to determine the contents of long-lived and non-gamma ray emitted nuclides. In the previous report, it was confirmed that the procedures based on the transport rate (the contained ration of the target nuclides vs. the reference ones) were quite useful to estimate the amounts of non-gamma ray emitted nuclides in the radioactive waste. In the presentation, the dose rate distribution had been evaluated, 137Cs contamination on the floor was estimated from the dose rate. The total 137Cs amounts in the Unit 3 RW/B was only 0.001% of the total inventory in the core, which showed only small contribution to the radioactive effluent. But the data might be of much importance for evaluation of the amounts of non g-emitted nuclides in the wastes based on the transport ratio model. The amounts of co-existing nuclides and their transfer routes should be continuously surveyed.