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Assembly-level analysis on temperature coefficient of reactivity in a graphite-moderated fuel salt reactor fueled with low-enriched uranium

引用

Nuclear Science and Techniques 2023年第5期34卷 67-84页

作者： Xiao-Xiao Li De-Yang Cui Chun-Yan Zou Jian-Hui Wu Xiang-Zhou Cai Jin-Gen Chen Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China CAS Innovative Academy in TMSR Energy System Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

To provide a reliable and comprehensive data reference for core geometry design of graphite-moderated and low-enriched uranium fueled molten salt reactors,the influences of geometric parameters on the temperature coefficient of reactivity(TCR)at an assembly level were characterized.A four-factor formula was introduced to explain how different reactivity coefficients behave in terms of the fuel salt volume fraction and assembly *** results show that the fuel salt temperature coefficient(FSTC)is always negative owing to a more negative fuel salt density coefficient in the over-moderated region or a more negative Doppler coefficient in the under-moderated *** on the fuel salt channel spacing,the graphite moderator temperature coefficient(MTC)can be negative or ***,an assembly with a smaller fuel salt channel spacing is more likely to exhibit a negative *** the fuel salt volume fraction increases,the negative FSTC first weakens and then increases,owing to the fuel salt density effect gradually weakening from negative to positive feedback and then ***,the MTC weakens as the thermal utilization coefficient caused by the graphite temperature effect ***,the negative TCR first weakens and then strengthens,mainly because of the change in the fuel salt density *** the assembly size increases,the magnitude of the FSTC decreases monotonously owing to a monotonously weakened fuel salt Doppler coefficient,whereas the MTC changes from gradually weakened negative feedback to gradually enhanced positive ***,the negative TCR ***,to achieve a proper negative TCR,particularly a negative MTC,an assembly with a smaller fuel salt channel spacing in the under-moderated region is strongly recommended.

关键词： Molten salt reactor temperature coefficient of reactivity Four-factor formula

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