Mechanism of deoxidization effect by hydrazine under gamma-ray irradiated condition

Yamamoto, Masahiro*; Motooka, Takafumi*; Sato, Tomonori

One of the corrosion mitigation countermeasures, hydrazine (N $_{2}$ H $_{4}$ ) addition to spent nuclear fuel pool (SFP) cooling water was adopted in Fukushima Daiichi Nuclear Power Station (1F). It is well-known that deoxygenation of N $_{2}$ H $_{4}$ at high temperature water is effective but the effect is smaller at the room temperature. However, gamma-ray irradiation would accelerate the deoxygenation of N $_{2}$ H $_{4}$ . To clarify the acceleration effect, gamma-ray irradiation tests of N $_{2}$ H $_{4}$ containing water were conducted in various conditions. Dissolved oxygen (DO) rapidly decreased in both N $_{2}$ H $_{4}$ containing pure water and artificial sea water by gamma-ray irradiation. The process was confirmed by the gamma-ray radiolysis model. These data pointed out a scientific meaning to the mitigation procedure of 1F site.

Language	:	Japanese
Journal	:	Zairyo To Kankyo
Volume	:	70
Number	:	12
Pages	:	p.392 - 395
Publication Year/Month	:	2021/12
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Paper URL	:	https://doi.org/10.3323/jcorr.70.392
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Keywords	:	使用済み燃料プール; ヒドラジン; ガンマ線照射; 脱酸素; 溶存酸素; SFP; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
Research Facility	:	コバルト60照射施設
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Registration No. : AA20210305
JAEA Abstracts No. :
Paper Submission No. : 30073

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