PSA SENSITIVITY ANALYSIS ON LOCA MODELLING WITH/WITHOUT CONSIDERING PARTIAL FRACTURES

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Loss of Coolant Accidents (LOCAs) inside and outside containment are typical initiating events considered in Probabilistic Safety Assessment (PSA). The LOCA events on individual lines are grouped by similar success criteria including availability of the mitigation systems. While keeping the total LOCA frequency unchanged, there could be two approaches to the LOCA modeling in PSA: (1) a LOCA event on each line is represented by guillotine break, or (2) partial fracture(s) is separately considered from guillotine break (e.g., Small and Medium LOCAs caused by cracks or hole on pipes of larger size with different success criteria). In this paper, the modelling uncertainty associated with the relatively simplified approach (1) is characterized by sensitivity analyses based on the detailed approach (2), using the ABWR (Advanced Boiling Water Reactor) PSA. LOCAs inside containment are analyzed by the internal events at power PSA while LOCAs outside containment are analyzed by the internal flooding at power PSA.

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