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勝山 幸三; 石見 明洋; 三輪 周平; 逢坂 正彦; 山中 伸介*; 黒崎 健*; 牟田 浩明*; 大石 佑治*; 米田 敦洋*
no journal, ,
原子炉事故時に生じる溶融炉心燃料(燃料デブリ)の計量管理手法として検討されている随伴FP線測定法において、燃料デブリ内の核物質に対する核分裂生成物の随伴性を評価する必要がある。そこで本研究では、随伴核種としてEuを選択し、模擬燃料デブリを用いた実験と熱力学平衡計算によりU-Eu-O系の熱力学データベースを構築した。
勝山 幸三; 石見 明洋; 三輪 周平; 逢坂 正彦; 山中 伸介*; 黒崎 健*; 牟田 浩明*; 大石 佑治*; 米田 敦洋*
no journal, ,
In the Fukushima Daiichi nuclear disaster, a significant amount of fuel debris was formed in the reactor. Even in the severe accident, special nuclear material (SNM) accountancy of the molten debris is required by the regulatory bodies to ensure no diversion of SNMs. As one of the accountancy technologies, passive spectrometry has been studied. In this method, high-energy gamma-emitting fission products (FPs) are quantified by the passive spectrometry. When the FPs co-exist with the SNM in the debris, the amount of the SNM can be estimated from the FP-SNM correlation obtained by inventory calculation. Eu is a candidate FP since it is one of the high-energy gamma-emitting FPs and known to co-exist with uranium in the normal spent fuels. A thermodynamic database is important to apply this method to the debris. In this study we aim to develop the database for U-Eu-O ternary system by CALPHAD technique.