Simulation of CsI decomposition in fuel cladding gap

Kenji Konashi, Yoshinobu Shiokawa, Hideo Kayano

研究成果: Article査読

6 被引用数 (Scopus)


There is a strong radiation field in operating fuel pins, which affects the chemical state of fission products. The effect of the radiation field on the iodine partial pressure in operating fuel pins has been theoretically studied. The decomposition rate of CsI in operating fuel pins has been calculated by a Monte Carlo code and the radiation effect on iodine partial pressure in a fuel-cladding gap has been evaluated. It has been found that the iodine partial pressure calculated with consideration of the radiation effect is higher than that in the thermal equilibrium without radiation. The probability of CsI decomposition has been calculated as a function of distance from the fuel surface. The calculation results show very large decomposition probability at the near surface of the fuel, where low energy particles are dominantly emitted. When the gap is closed, the very high partial pressure of iodine is expected in a remaining small space between fuel and cladding.

ジャーナルJournal of Nuclear Materials
出版ステータスPublished - 1996 1月 1

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)


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