Risk-informed assessment of defence in depth, LOCA example: Phase 1: Mapping of conditions and definition of quantitative measures for the defence in depth levels

Jan-Erik Holmberg, Jan Nirmark

Research output: Book/ReportReport

Abstract

The concept of defence-in-depth (DID) is fundamental to safety of nuclear power plants. It calls for multiple successive methods or barriers to radioactive release to the environment. This work develops a methodology based on a plant-specific probabilistic safety assessment (PSA) for an assessment of DID levels of a nuclear power plant. It includes: 1) mapping of conditions that should be considered for the DID levels, and 2) definition of quantitative measures that should be considered for the defence in depth levels. The work has been limited to loss-of-coolant accidents (LOCA) and DID levels 1 and 2, i.e., prevention of abnormal operation and failures and control of abnormal operation and detection of failures. Examples are chosen both from power operation LOCAs and LOCAs during cold shutdown
Original languageEnglish
Place of PublicationStockholm
PublisherSwedish Radiation Safety Authority SSM
Number of pages42
Publication statusPublished - 2008
MoE publication typeD4 Published development or research report or study

Publication series

SeriesSKI Rapport
Volume2008:33
ISSN1104-1374

Keywords

  • Defence-in-depth
  • nuclear power plant
  • safety
  • risk
  • probabilistic safety assessment
  • loss of coolant accident

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