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Determination of $$^{79}$$Se and $$^{135}$$Cs in spent nuclear fuel for inventory estimation of high-level radioactive wastes

高レベル放射性廃棄物中の長寿命核種インベントリ評価を目的とした使用済燃料中の$$^{79}$$Se及び$$^{135}$$Csの定量

浅井 志保; 半澤 有希子; 奥村 啓介; 篠原 伸夫; 伊奈川 潤; 宝徳 忍; 鈴木 健介*; 金子 悟*

Asai, Shiho; Hanzawa, Yukiko; Okumura, Keisuke; Shinohara, Nobuo; Inagawa, Jun; Hotoku, Shinobu; Suzuki, Kensuke*; Kaneko, Satoru*

$$^{79}$$Se and $$^{135}$$Cs are long-lived fission products and are found in high-level radioactive waste (HLW). The estimation of their inventories in HLW is essential for the safety assessment of a geological disposal, owing to their mobility in the strata. In this study, the amounts of $$^{79}$$Se and $$^{135}$$Cs in spent nuclear fuel solution were measured. About 5 g of irradiated UO$$_{2}$$ fuel discharged from a commercial Japanese PWR with the average burn-up of 44.9 GWd/t was sampled. After Se and Cs were chemically separated, the amounts of $$^{79}$$Se and $$^{135}$$Cs in the spent nuclear fuel solution were measured with inductively coupled plasma quadrupole mass spectrometer (ICP-QMS). The amounts of $$^{79}$$Se and $$^{135}$$Cs were 5.2 $$pm$$ 1.5 and 447 $$pm$$ 40 g/MTU, respectively. The results obtained in this study showed good agreement with those obtained by the ORIGEN2 calculation using the data library of JENDL-3.3.

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