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
ISSN2210-3147
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 
DOI10.1007/s41365-017-0234-7
收录类别SCI
语种英语
引用统计
被引频次:3[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
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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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