Results and progress of fundamental research on FP chemistry

Osaka, Masahiko  ; Nakajima, Kunihisa  ; Miwa, Shuhei  ; Miyahara, Naoya; Suzuki, Eriko   ; Suzuki, Chikashi ; Horiguchi, Naoki   ; Imoto, Jumpei ; Liu, J.  ; Nishioka, Shunichiro; Miradji, F.; Kobata, Masaaki  ; Okane, Tetsuo  

Fundamental research on fission product (FP) chemistry is underway at Japan Atomic Energy Agency. The purpose is to establish a FP chemistry database in each region of a LWR under severe accident conditions. Improvement of FP chemical models based on this database is also an important task of the research. Research outputs are reflected to the research and development of decommissioning of Fukushima Daiichi Nuclear Power Station (1F) and the enhancement of LWR safety. Four research items have thus been established considering the specific issues of 1F and the priority in the source term research area, as follows: - Effects of boron (B) release kinetics and thermal-hydraulic conditions on FP behavior, - Cesium (Cs) chemisorption and reactions with structural materials, - Establishment of a thermodynamic and thermophysical properties database for FP compounds, - Development of experimental and analytical techniques for the reproduction of FP behavior. In this paper, results and progress of the research are presented.