検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

$$gamma$$線照射環境下でのヒドラジンの脱酸素効果とその機構

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

山本 正弘*; 本岡 隆文*; 佐藤 智徳  

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

福島第一原子力発電所(1F)の事故後の腐食対策としてヒドラジン(N$$_{2}$$H$$_{4}$$)の添加が実施された。N$$_{2}$$H$$_{4}$$は高温では化学的に脱酸素を起こすが、常温ではその効果が低くなることが知られていた。しかしながら、$$gamma$$線照射がこの作用を加速する可能性があった。そこで、N$$_{2}$$H$$_{4}$$を含む溶液での$$gamma$$線照射試験を実施し、$$gamma$$線照射により、N$$_{2}$$H$$_{4}$$を含む純水と人工海水の双方で溶存酸素が減少することを明らにした。またその結果は$$gamma$$線のラジオリシス計算からも確認した。これらのデータは、1Fの防食対策に対して科学的な根拠を与えることとなった。

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.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.