Analysis of MBLOCA and LBLOCA success criteria in VVER-1000/V320 reactors: New proposals for PSA Level 1

The specific configuration of the safety systems in VVER-1000/V320 reactors allows a comprehensive study of the Loss of Coolant Accident (LOCA). In the present paper, a verification of the success criteria of the event trees headers for the medium and large break LOCA sequences is conducted. A detai...

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Bibliographic Details
Published in:Nuclear engineering and technology 2023, 55(2), , pp.623-639
Main Authors: Redondo-Valero, Elena, Queral, César, Fernandez-Cosials, Kevin, Sanchez-Espinoza, Víctor Hugo
Format: Article
Language:English
Subjects:
LOCA
PSA
TRACE
VVER-1000/V320
원자력공학
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Summary:The specific configuration of the safety systems in VVER-1000/V320 reactors allows a comprehensive study of the Loss of Coolant Accident (LOCA). In the present paper, a verification of the success criteria of the event trees headers for the medium and large break LOCA sequences is conducted. A detailed TRACEV5P5 thermal-hydraulic model of the reactor has been developed, including all safety systems. When analyzing the results of all sequences, some conservatism is observed in certain specific configurations as the success criterion of some headers is not consistent with the classic PSA level 1. Therefore, new proposals for the LOCA event trees are performed based on a reconfiguration of LOCA break ranges and the use of the expanded event trees approach. •Verification of MBLOCA and LBLOCA success criteria for VVER-1000/V320•Conservative classic VVER-1000/V320 success criteria•New proposals for VVER-1000/V320 MBLOCA and LBLOCA PSA level 1
ISSN:1738-5733
2234-358X
DOI:10.1016/j.net.2022.10.006