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※ 半角英数字
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シビアアクシデント時のFP放出挙動及びFP化学に関する基礎研究

Fundamental study on release and chemical behaviors of fission products during severe accident

逢坂 正彦

Osaka, Masahiko

シビアアクシデント時のソースターム評価手法高度化の鍵となる核分裂生成物(FP)の化学を明らかにすることを目指した研究の全体計画を紹介する。炉内各所でのFP化学形とその割合を実測に基づいて評価してデータベース化することを目的とし、燃料から放出された直後及び低温部に沈着したFP化学形の直接測定技術を開発して、照射済燃料等を用いたFP放出・移行模擬試験におけるFP化学形の測定を行う。沈着FPへのB蒸気の影響に関する予備的知見等、これまでに得られた結果も紹介する。

Research program for chemical behavior of fission products during severe accident is introduced. The goal is to construct a database for FP chemistry at each stage of the nuclear power station. In-situ measurement techniques of the FP chemical form are developed for those just after release from fuel and deposited onto the structural materials. Reproduction test for FP release and transport behaviors are performed using irradiated fuels for the chemical form determination by means of the developed techniques for in-situ chemical form determination. Several preliminary results such as B effects on deposited FP are also given.

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