Potential of FAST (floating absorber for safety at transient) as a solution for positive coolant temperature coefficient in sodium-cooled FAST reactors

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Floating absorber for safety at transient (FAST) is a passive safety device for sodium-cooled fast reactors. It is designed to insert negative reactivity in case of coolant temperature rise or coolant voiding in an inherently passive way. This study investigates behavior of FAST device during the anticipated transients without scram (ATWS) in a sodium-cooled breed-and-burn fast reactor (B&BR). Unprotected loss of flow (ULOF), unprotected loss of heat sink (ULOHS) and unprotected transient overpower (UTOP) scenarios are simulated at both MOL (middle of life) and EOL (end of life) conditions of the B&BR to investigate the impacts of FAST on the reactor safety. It is confirmed that FAST can very successfully mitigate the consequences of ULOF, ULOHS and UTOP even in the B&BR core with strongly positive coolant temperature coefficient. In addition, this paper provides key aspects of FAST design optimization for practical applications. (C) 2019 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2020-03
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.137

ISSN
0306-4549
DOI
10.1016/j.anucene.2019.107048
URI
http://hdl.handle.net/10203/272356
Appears in Collection
NE-Journal Papers(저널논문)
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