 The EPRI HRA Calculator® is a software tool designed to facilitate a standardized approach to human reliability analysis (HRA). Wide varieties of methodologies are used for HRA in probabilistic risk assessment (PRA). The results from these differing methodologies can vary considerably when comparing results between similar plants, or even when comparing the actions within the same plant that are evaluated by different analysts. EPRI is sponsoring several initiatives in the development of HRA products and tools to improve the consistency and capability of HRAs. Scientech - in collaboration with EPRI, utilities, and other participants - supports these efforts and put into practice the initiative to develop the EPRI The EPRI HRA Calculator® as a tool for standardizing HRA.
The EPRI HRA Calculator® is designed to ensure that an HRA performed with it will satisfy the HRA criteria of the American Society of Mechanical Engineers (ASME) PRA standard as implemented by USNRC Regulatory Guide 1.200. Risk-informed PRA applications use the ASME PRA standard to ensure PRA quality. In order to improve the review and approval process of risk-informed PRA applications, EPRI has taken the initiative to develop the EPRI The EPRI HRA Calculator® as a standardized tool that will ensure compliance with the ASME PRA standard.
Basic Functionality
The EPRI HRA Calculator® includes modules for pre-initiator, post-initiator and dependency analyses. The pre-initiator module encapsulates the procedure review and historical events review through which pre-initiator (also known as latent) human failure events (HFEs) are identified. For the quantification of pre-initiator HFEs, the user can select ASEP or THERP. The post-initiator module functions on the basis that each post-initiator HFE (also known as dynamic HFE) comprises a cognitive error and an execution error. The cognitive error can be analyzed using the CBDTM, HCR/ORE, Annunciator Response, or the SPAR-H method. The execution error is analyzed using THERP. The user can analyze an HFE using any, or all, of the applicable methods. The dependency analysis module identifies combinations of HFEs, using cutsets that can be imported directly. The user can specify to analyze combinations of pre-initiators, post-initiators, or both pre and post-initiators. The HFE combinations and associated cutsets can be sorted in order of importance to focus the analysis and optimize resources. Basic dependency rules are applied to the HFE combinations to calculate conditional and joint human error probabilities (HEPs).
The HRA Calculator is designed to electronically interface with the Risk & Reliability (R&R) workstation, and other PRA software tools such as WinNUPRA. Generic software interfaces are provided through the exporting of data to comma separated (CSV) text files, MS Excel, and MS Word.
For additional information on the The EPRI HRA Calculator® , contact
Jan Grobbelaar, Tel: US (800) 862-6702, (International) +1 (206) 248-1818 ext 231 or jgrobbelaar@curtisswright.com
The EPRI HRA Calculator® is a registered trademark of EPRI, the Electric Power Research Institute, Inc.
MS Excel and MS Word are registered trademarks of Microsoft Corporation.
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