Toward evaluation of cesium chemistry during transportation in a boiling water reactor; Effects of boron on cesium chemistry

Miwa, Shuhei  ; Miyahara, Naoya*; Nakajima, Kunihisa  ; Imoto, Jumpei ; Suzuki, Eriko   

In the BWR severe accident, it was indicated that the control material boron significantly influences chemical behavior and transition behavior of cesium, which is important from the viewpoint of exposure, and it causes great uncertainty in the prediction of environmental release and distribution in the reactor. Therefore, in order to elucidate the important chemistry to be considered in severe accident analysis, we have developed the experimental setup that enables the evaluation of chemistry during transportation in the reactor, and evaluated cesium chemistry. Based on the results, we developed the chemistry database named ECUME composed of datasets and models that are the basis of chemical reaction analysis so that chemical behavior could be evaluated by severe accident analysis code.