DEVELOPMENT AND APPLICATION OF A METHODOLOGY TO APPLY HUMAN RELIABILITY ANALYSIS TO AN INDEPENDENT SPENT FUEL STORAGE INSTALLATION

摘要

Human performance plays a considerable role in Independent Spent Fuel Storage Installations handling operations. Human error probabilities should be introduced into ISFSIs' PSAs. An HRA methodology has been developed, based on ATHEANA, in which relying upon experts is not mandatory. ATHEANA's quantification process, which is carried out by Expert Elicitation, is modified by introducing an estimation algorithm. The aim is to obtain the HEPs of Human Failure Events from elemental and generic human failure probability values. Human Failure Event Trees are introduced as the base for the description, delineation and quantification of HFEs. The structure of HFETs is formed by human failure basic events called Unsafe Actions. A classic model is used to quantify generic UAs. SPAR-H is introduced into the algorithm to assess PSFs. The estimation algorithm modifies the way ATHEANA is applied. The analysts' efforts have to be placed on deeply analyzing the Operation Procedures and the context of study rather than applying the Elicitation process. The methodology has been applied to a specific ISFSI and the results are consistent with the Operative Experience present in NUREG-1774 and NUREG-0612. The delineation ofHFETs has demanded a considerable effort.