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Modification of the SPAR-H method to support HRA for Level 2 PSA

Abstract of the technical paper/presentation presented at:
13th International Conference on Probabilistic Safety Assessment and Management 
Seoul, South Korea
October 2–7, 2016

Prepared by:
Georgeta Banaseanu, Michael Xu, Yolande Akl
Canadian Nuclear Safety Commission – Ottawa, Ontario, Canada
Shawn St. Germain and Ronald Boring
Idaho National Laboratory - Idaho Falls, Idaho, USA


Currently available Human Reliability Analysis (HRA) methods were generally developed to support Level 1 probabilistic safety analysis (PSA) models. There has been an increased emphasis placed on Level 2 PSA in recent years; however, the currently used HRA methods are not ideal for this application, including the SPAR-H method (NUREG/CR-6883). In addition, integration of Emergency Mitigation Equipment (EME) and Severe Accident Management Guidelines (SAMG) in events mitigation adds another layer of complexity in evaluation of HRA. Through a joint project, the Canadian Nuclear Safety Commission (CNSC) and Idaho National Laboratory (INL) are investigating modifications to the SPAR-H method, to create more consistency in applying performance shaping factors (PSFs) used in the method for Level 2 analysis. This will be accomplished by adapting the SPAR‑H guidance and tables for PSF selection for Level 2 PSA and EME/SAMG integration. This paper presents the modifications made to PSF multipliers for diagnosis and actions to better support HRA for Level 2 PSA and EME/SAMG integration.

In addition, two types of calculations were made to demonstrate that the SPAR-H model may be expanded to cover Level 2 PSA and/or PSA for external events.

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