Study of the effect of {sup 135}Xe poison on the temperature coefficient of TRIGA fuel
Conference
·
OSTI ID:21141189
- TRIGA Reactor Facility, Institute for Nuclear Research, Pitesti (Romania)
A study of the influence of {sup 135}Xe on the prompt negative temperature coefficient of the 14-MW Romanian TRIGA reactor has been performed. Because of its large absorption cross section below 0.1 eV, we expected that {sup 135}Xe might make a positive contribution to the temperature coefficient because the higher-energy neutrons are less likely to be absorbed by the Xe. This effect would be largest about 16 hours after reactor shutdown. In order to investigate this phenomenon, we have performed cell and core calculations for various fuel temperatures, burnups, and {sup 135}Xe levels. These calculations indeed show a positive contribution of {sup 135}Xe to the temperature coefficient, especially for high burnups, where little {sup 167}Er remains to absorb the higher-energy neutrons. Work is in progress to evaluate the effect of the smaller negative temperature coefficient on the consequences of reactivity insertion accidents in unfavorable situations of {sup 135}Xe poisoning of the Romanian TRIGA core. (author)
- Research Organization:
- General Atomics, San Diego, CA (United States)
- OSTI ID:
- 21141189
- Report Number(s):
- INIS-US--09N0020; TOC--24
- Country of Publication:
- United States
- Language:
- English
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