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福島第一原子力発電所における事故直前の核種インベントリ評価

Nuclide inventory evaluation in the cores of Fukushima Dai-ichi Nuclear Power Station at the time of the nuclear accident

岡本 力; 奥村 啓介; 小嶋 健介; 羽倉 洋行; 須山 賢也; 永瀬 文久

Okamoto, Tsutomu; Okumura, Keisuke; Kojima, Kensuke; Hagura, Hiroyuki; Suyama, Kenya; Nagase, Fumihisa

福島第一原子力発電所の炉内状況把握、燃料デブリや放射化瓦礫等の廃棄体の処理・処分法の計画立案、事故進展解明等に資するため、日本の最新核データであるJENDL-4.0とモジュラー型炉心解析コードシステムMOSRAを使用して、事故直前における1号機から3号機の炉内3次元核種インベントリ量の計算評価を行い、精度の良いインベントリ情報を得た。

Three-dimensional nuclides inventory evaluation was carried out for each core of unit-1, 2, 3 in the Fukushima Dai-ichi Nuclear Power Station at the time of the nuclear accident. In the evaluation, the modular system for reactor analyses (MOSRA) and the latest Japanese nuclear data library JENDL-4.0 were employed. The obtained inventory data is useful for the assessment of the broken core situation, planning of future disposal of radioactive wastes, such as fuel debris, polluted rubble, and so on.

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