Impact of photoneutrons on reactivity measurements for TMSR-SF1

doi:10.1007/s41365-017-0234-7

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	Impact of photoneutrons on reactivity measurements for TMSR-SF1
	Ji, RM; Li, MH; Zou, Y; Liu, GM
	2017
发表期刊	NUCLEAR SCIENCE AND TECHNIQUES
ISSN	2210-3147
卷号	28 期号:6 页码:76
文章类型	期刊论文
摘要	The solid-fueled thorium molten salt reactor (TMSR-SF1) is a 10 MWth test reactor design to be deployed in 5-10 years by the TMSR group. Its design combines coated particle fuel and molten FLiBe coolant for great intrinsic safety features and economic advantages. Due to a large amount of beryllium in the coolant salt, photoneutrons are produced by (gamma, n) reaction, hence the increasing fraction of effective delayed neutrons in the core by the photoneutrons originating from the long-lived fission products. Some of the delayed photoneutron groups are of long lifetime, so a direct effect is resulted in the transient process and reactivity measurement. To study the impact of photoneutrons for TMSR-SF1, the effective photoneutron fraction is estimated using k-ratio method and performed by the Monte Carlo code (MCNP5) with ENDF/B-VII cross sections. Based on the coupled neutron-photon point kinetics equations, influence of the photoneutrons is analyzed. The results show that the impact of photoneutrons is not negligible in reactivity measurement. Without considering photoneutrons in on-line reactivity measurement based on inverse point kinetics can result in overestimation of the positive reactivity and underestimation of the negative reactivity. The photoneutrons also lead to more waiting time for the doubling time measurement. Since the photoneutron precursors take extremely long time to achieve equilibrium, a "steady'' power operation may not directly imply a "real'' criticality.
关键词	Tmsr-sf1 delayed Photoneutrons Coupled Neutron–photon Point Kinetics Reactivity Measurement
DOI	10.1007/s41365-017-0234-7
收录类别	SCI
语种	英语
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/28688
专题	中科院上海应用物理研究所2011-2018年
推荐引用方式 GB/T 7714	Ji, RM,Li, MH,Zou, Y,et al. Impact of photoneutrons on reactivity measurements for TMSR-SF1[J]. NUCLEAR SCIENCE AND TECHNIQUES,2017,28(6):76.
APA	Ji, RM,Li, MH,Zou, Y,&Liu, GM.(2017).Impact of photoneutrons on reactivity measurements for TMSR-SF1.NUCLEAR SCIENCE AND TECHNIQUES,28(6),76.
MLA	Ji, RM,et al."Impact of photoneutrons on reactivity measurements for TMSR-SF1".NUCLEAR SCIENCE AND TECHNIQUES 28.6(2017):76.

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