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高レベル濃縮廃液の乾固過程におけるルテニウムの放出特性

Release Characteristics of Ruthenium from Highly Active Liquid Waste in Drying Step

田代 信介 ; 天野 祐希 ; 吉田 一雄 ; 山根 祐一 ; 内山 軍蔵 ; 阿部 仁 

Tashiro, Shinsuke; Amano, Yuki; Yoshida, Kazuo; Yamane, Yuichi; Uchiyama, Gunzo; Abe, Hitoshi

高レベル濃縮廃液(HALW)が沸騰・乾固に至る事故条件におけるHALWからのRuの放出特性を調べた。実験室規模の装置を用い、非放射性物質からなる模擬HALW試料を乾固するまで加熱して、ルテニウムならびにNOxガスの放出特性を観察した。その結果、模擬HALW試料温度が120$$sim$$300$$^{circ}$$Cにおいて、ルテニウムは顕著に放出した。最終的なRuの積算放出割合は0.088であった。また、模擬HALW試料温度に対するルテニウムの放出量は、約140$$^{circ}$$Cに極大、約240$$^{circ}$$Cに最大となる2つのピークを有することが分かった。模擬HALW試料から放出される水蒸気と硝酸の混合蒸気を凝縮させて捕集した凝縮液量やNOxガスの放出速度の測定結果と関係づけて、模擬HALW試料温度に対するルテニウムの放出量に2つのピークが生じる要因を検討した。

The release characteristics of Ru from highly active liquid waste (HALW) have been investigated under the condition of accidental evaporation to dryness by boiling of HALW. Using a laboratory-scale apparatus, non-radioactive simulated HALW (s-HALW) was heated with an external heater to dryness to observe the release characteristics of Ru and gaseous nitrogen oxides. As a result, Ru was significantly released between 120 and 300 $$^{circ}$$C of the s-HALW. The cumulative release ratio of Ru was 0.088. It was also found that the partially released amount of Ru against the temperature of the s-HALW had two peaks with one maximal at about 140 $$^{circ}$$C and maximum at about 240 $$^{circ}$$C. Referring to the results of the release rate of gaseous nitrogen oxides and the volume of condensate, which was a collection of the mixed vapors of steam and nitric acid released from the s-HALW, we discussed the causes of Ru release around these peaks.

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