Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
