Transport behavior of radionuclides into the accumulated water at the Fukushima Daiichi NPS

福島第一原子力発電所における滞留水への放射性核種の移行挙動

駒 義和  ; 柴田 淳広  

Koma, Yoshikazu; Shibata, Atsuhiro

損傷した燃料等から滞留水へ放射性核種が移行したふるまいに関して、滞留水に含まれる放射性核種の濃度を燃料組成により規格化して検討した。滞留水への移行しやすさは、Csに比べてSe, I, Hが大きく、Srが同程度、TRUはごく小さかった。

The radioactive contaminated water has been accumulated at the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company (TEPCO). Radioactivity concentrations determined for the water was normalized with the fuel composition and divided by that for Cs in order to investigate behavior of some elements to contaminate the water. Transport of Sr was initially suppressed and gradually increased to the extent comparable to Cs until almost one year. Transport of He, I and Se were greater than that of Cs. Transport of Pu, Am, Cm and Eu were considerably small. Concerning activation product the extent of Co transport was significant than that of Ni.