Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Current Status and Applications of Integrated Safety Assessment and Simulation Code System for ISA

  • Izquierdo, J.M. (Modeling and Simulation Area (MOSI), Nuclear Safety Council (CSN)) ;
  • Hortal, J. (Modeling and Simulation Area (MOSI), Nuclear Safety Council (CSN)) ;
  • Sanchez Perea, M. (Modeling and Simulation Area (MOSI), Nuclear Safety Council (CSN)) ;
  • Melendez, E. (Modeling and Simulation Area (MOSI), Nuclear Safety Council (CSN)) ;
  • Queral, C. (Energy and Fuels Department, Technical University of Madrid (UPM)) ;
  • Rivas-Lewicky, J. (Energy and Fuels Department, Technical University of Madrid (UPM))
  • Received : 2016.11.28
  • Accepted : 2017.01.13
  • Published : 2017.04.25
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Abstract

This paper reviews current status of the unified approach known as integrated safety assessment (ISA), as well as the associated SCAIS (simulation codes system for ISA) computer platform. These constitute a proposal, which is the result of collaborative action among the Nuclear Safety Council (CSN), University of Madrid (UPM), and NFQ Solutions S.L, aiming to allow independent regulatory verification of industry quantitative risk assessments. The content elaborates on discussions of the classical treatment of time in conventional probabilistic safety assessment (PSA) sequences and states important conclusions that can be used to avoid systematic and unacceptable underestimation of the failure exceedance frequencies. The unified ISA method meets this challenge by coupling deterministic and probabilistic mutual influences. The feasibility of the approach is illustrated with some examples of its application to a real size plant.

Keywords

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