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

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

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.

Language	:	Japanese
Journal	:	Nihon Genshiryoku Gakkai Wabun Rombunshi
Volume	:	14
Number	:	4
Pages	:	p.227 - 234
Publication Year/Month	:	2015/12
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Paper URL	:	https://doi.org/10.3327/taesj.J14.028
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	再処理施設; 高レベル濃縮廃液; ルテニウム
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Article of JAEA R&D Review	:	Acquisition of Data Required for Severe-Accident Evaluation in a Reprocessing Plant; Understanding the Release Characteristics of Ruthenium from Highly Active Liquid Waste during a Drying Step[/]
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Registration No. : AA20140430
JAEA Abstracts No. : 44000270
Paper Submission No. : 16959

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