[3D05-07] Corrosion Chemistry and FP Behavior 2

[3D07] Evaluation of Short and Long-Term Behavior of Radioactive Nuclides Distributed in Fukushima Daiichi NPP

5. Evaluation of short and long-term radioactive nuclide behavior in the contaminated water

*Shunsuke Uchida¹, Hidetoshi karasawa¹, Chiaki Kino¹, Masanori Naitoh¹, Masahiko Ohsaka² (1. Institute of Applied Energy, 2. Japan Atomic Energy Agency)

Keywords:Fukushima Daiichi NPP, contaminated water, fisshion products, severe accident

The radioactive FPs in the contaminated water stored in the basement of T/B were constant for 6 years after the 1F accident, while 137Cs and 3T radioactivity concentrations have increased as reducing inventory of the water due to reducing ground water leakage. By applying the short/long term FP behavior evaluation procedure, it was explained that the increase in leakage water from the R/B due to water level between R/B and T/B resulted in increase in radioactivity in the contaminated water.