Comparison of post-irradiation experimental data and theoretical calculations for inventory estimation of long-lived fission products in spent nuclear fuel

使用済燃料中に含まれる長寿命核種インベントリ評価のための照射後試験データの取得と理論計算値との比較

浅井 志保; 半澤 有希子  ; 奥村 啓介 ; 鈴木 英哉; 利光 正章; 篠原 伸夫 ; 金子 悟*; 鈴木 健介*

Asai, Shiho; Hanzawa, Yukiko; Okumura, Keisuke; Suzuki, Hideya; Toshimitsu, Masaaki; Shinohara, Nobuo; Kaneko, Satoru*; Suzuki, Kensuke*

The inventory estimation of long-lived fission products (LLFP) is essential for the safety assessment of a geological disposal of HLW. Se and Cs are a main contributor to the total dose from the geological repository of HLW. In this study, the post irradiation experimental data of LLFPs, such as Se, Tc, Sn and Cs, were compared with ORIGEN2 calculation. A fragment of the UO pellet irradiated in a commercial PWR was dissolved with nitric acid in a hot cell. After Se, Tc, Sn, and Cs were chemically separated, the concentrations of Se, Tc, Sn and Cs were determined with ICP-QMS. The results for Se and Cs obtained in this study showed good agreement with those obtained through ORIGEN2 calculation. In contrast, the experimentally determined concentration of Tc and Sn were equivalent to approximately 70% and 60%, respectively, of those obtained through ORIGEN2 calculation.