Sm-149 evolution behavior in a small modular molten salt reactor

doi:10.1016/j.anucene.2018.05.037

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

	Sm-149 evolution behavior in a small modular molten salt reactor
	Wu, JH ; Chen, JG ; Yu, CG ; Zou, CY ; Ma, YW ; Li, XX ; Cai, XZ
刊名	ANNALS OF NUCLEAR ENERGY
	2018
卷号	120 期号:-页码:100-107
关键词	XENON OSCILLATIONS
ISSN号	0306-4549
DOI	10.1016/j.anucene.2018.05.037
文献子类	期刊论文
英文摘要	Compared with the well-studied neutron poison Xe-135,Sm-149 received much less attention in the conventional reactors because of the comparatively smaller neutron absorption cross section. But in Molten Salt Reactor (MSR), gaseous fission products such as xenon and krypton are largely removed by the gas removal system, the behavior of Sm-149, which exists in molten salt, therefore becomes important. During MSR's operation, the liquid fuel continuously circulates through the core (with neutron flux functioning) and outer-loop (the part of primary loop at external core, with negligible neutron flux), the nuclide evolution law is much different from that in the solid fueled reactors, thereby accurately evaluating the time behavior of Sm-149 is much needed. In this work, the control equations precisely describing the nuclide evolution of Sm-149 as well as its precursor Pm-149 entrained in the flowing salt are deduced, and a time behavior during different power cycles is then investigated for a small modular molten salt reactor based on the deduced equations. To fundamentally understand the flow effect on Sm-149 time behavior, the corresponding results are compared with those calculated by using the existent method, in which the flowing fuel is treated as the static fuel. Because the disappeared Pm-149 regardless at the core and outer-loop is all converted to Sm-149, the flow state has a same equilibrium atomic density with that at the static state. But the time for achieving the equilibrium at the flow state is prolonged due to the time for Pm-149 decayed to Sm-149 being extended at a same Pm-149 production rate. This effect also leads to a lower "samarium peaking (overshoot)" for power up/down, as well as a lower Sm-149 concentration after scram which subsequently decreases the neutron poison (around 210 pcm) as the core start-up again. This work provides a precise description for the evolution of Sm-149 for circulating fuel, which should be included in the core design and source term analysis of safety study of a MSR. (C) 2018 Elsevier Ltd. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31111]
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, CAS Innovat Acad TMSR Energy Syst, Shanghai 201800, Peoples R China 3.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
推荐引用方式 GB/T 7714	Wu, JH,Chen, JG,Yu, CG,et al. Sm-149 evolution behavior in a small modular molten salt reactor[J]. ANNALS OF NUCLEAR ENERGY,2018,120(-):100-107.
APA	Wu, JH.,Chen, JG.,Yu, CG.,Zou, CY.,Ma, YW.,...&Cai, XZ.(2018).Sm-149 evolution behavior in a small modular molten salt reactor.ANNALS OF NUCLEAR ENERGY,120(-),100-107.
MLA	Wu, JH,et al."Sm-149 evolution behavior in a small modular molten salt reactor".ANNALS OF NUCLEAR ENERGY 120.-(2018):100-107.