Effects of fuel salt composition on fuel salt temperature coefficient (FSTC) for an under-moderated molten salt reactor (MSR)

doi:10.1007/s41365-018-0458-1

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Effects of fuel salt composition on fuel salt temperature coefficient (FSTC) for an under-moderated molten salt reactor (MSR)
	Li, XX ; Ma, YW ; Yu, CG ; Zou, CY ; Cai, XZ ; Chen, JG
刊名	NUCLEAR SCIENCE AND TECHNIQUES
	2018
卷号	29 期号:8 页码:-
关键词	PLUTONIUM DYNAMICS CYCLE
ISSN号	1001-8042
DOI	10.1007/s41365-018-0458-1
文献子类	期刊论文
英文摘要	With respect to a liquid-fueled molten salt reactor (MSR), the temperature coefficient of reactivity mainly includes the moderator temperature coefficient (MTC) and the fuel salt temperature coefficient (FSTC). The FSTC is typically divided into the Doppler coefficient and the density coefficient. In order to compensate for the potentially positive MTC, the FSTC should be sufficiently negative, and this is mostly optimized in terms of the geometry aspect in pioneering studies. However, the properties of fuel salt also directly influence the FSTC. Thus, the effects of different fuel salt compositions including the U-235 enrichment, heavy metal proportion in salt phase (HM proportion), and the Li-7 enrichment on FSTC are investigated from the viewpoint of the essential six-factor formula. The analysis is based on an under-moderated MSR. With respect to the Doppler coefficient, the temperature coefficient of the fast fission factors (alpha(T)(epsilon)) is positive and those of the resonance escape probability (alpha(T)(p)), thermal reproduction factor (alpha(T)(eta)), thermal utilization factor (alpha(T)(f)), and total non-leakage probability (alpha(T)(Lambda)) are negative. With respect to the density coefficient, a alpha(T)(p) and alpha(T)(eta) are positive, while the others are negative. The results indicate that the effects of the U-235 enrichment and HM on FSTC are mainly reflected in alpha(T)(epsilon) and alpha(T)(p), which are the dominant factors when the neutron spectrum is relatively hard. Furthermore, the Li-7 enrichment influences FSTC by alpha(T)(f) and alpha(T)(Lambda), which are the key factors in a relative soft spectrum. In order to obtain a more negative FSTC for an under-moderated MSR, the possible positive density coefficient, especially its alpha(T)(p), should be suppressed. Thus, a lower U-235 enrichment (albeit higher than a certain value, 5 wt% in this article) along with a lower HM proportion and/or a higher Li-7 enrichment are recommended. The analyses provide an approach to achieve a more suitable fuel salt composition with a sufficiently negative FSTC.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/30919]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Chinese Acad Sci, CAS Innovat Acad TMSR Energy Syst, Shanghai 201800, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, XX,Ma, YW,Yu, CG,et al. Effects of fuel salt composition on fuel salt temperature coefficient (FSTC) for an under-moderated molten salt reactor (MSR)[J]. NUCLEAR SCIENCE AND TECHNIQUES,2018,29(8):-.
APA	Li, XX,Ma, YW,Yu, CG,Zou, CY,Cai, XZ,&Chen, JG.(2018).Effects of fuel salt composition on fuel salt temperature coefficient (FSTC) for an under-moderated molten salt reactor (MSR).NUCLEAR SCIENCE AND TECHNIQUES,29(8),-.
MLA	Li, XX,et al."Effects of fuel salt composition on fuel salt temperature coefficient (FSTC) for an under-moderated molten salt reactor (MSR)".NUCLEAR SCIENCE AND TECHNIQUES 29.8(2018):-.