硝酸銀水溶液のヨウ素・有機ヨウ素除去特性について基礎検討

Taizo Kanai*, Masahiro Furuya, Satoshi Nisimura

*この研究の対応する著者

研究成果: Article査読

抄録

When excess pressure and temperature are added to a containment vessel of a nuclear power plant during a severe accident, damage of the containment vessel and the release of radioactive materials into the environment are expected. Filtered containment venting systems(FCVS)installed in exhaust systems reduce the release of radioactive materials by the use of multistage filters. In actual FCVS, several types of alkaline solution are used in the scrubbing stage to capture the radioactive iodine(I2). Therefore, it is difficult to remove CH3I by the alkaline solution, and molecular sieves such as silver zeolites installed downstream of the scrubbing stage are used to capture the organic iodide (CH3I). Silver nitrate aqueous solution(AgNO3 aq.)is highly reactive against iodine; hence, by using AgNO3 aq., the removal of organic iodide in the scrubbing stage can be expected. We have conducted basic evaluations of the removal properties of iodine and organic iodide by AgNO3 aq. using small-scale and pool-scrubbing(inner diameter: 300 mm)test sections at ambient temperature and pressure. The small-scale test results show that AgNO3 aq. has the same I2 removal performance as sodium hydroxide aqueous solution(NaOH aq.). Moreover, the pool-scrubbing test results show that a CH3I decontamination factor(DF)of over 50 can be expected under the conditions of a AgNO3 concentration ≥ 10 wt% and submergence ≥ 1.14 m.

寄稿の翻訳タイトルEvaluation of the removal properties of iodine and organic iodide by a AgNO3 solution
本文言語Japanese
ページ(範囲)16-23
ページ数8
ジャーナルTransactions of the Atomic Energy Society of Japan
19
1
DOI
出版ステータスPublished - 2020
外部発表はい

Keywords

  • Decontamination
  • Filtered containment venting system
  • Iodine
  • Organic iodide
  • Severe accident

ASJC Scopus subject areas

  • 原子力エネルギーおよび原子力工学
  • 安全性、リスク、信頼性、品質管理

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