Evaluation of the use of engineering judgements applied to analytical human reliablity analysis methods (HRA)

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Title: Evaluation of the use of engineering judgements applied to analytical human reliablity analysis methods (HRA)
Author: Kohlhepp, Katherine D.
Abstract: Due to the scarcity of Human Reliability Analysis (HRA ) data , one of the key elements of any HRA analysis is use of engineering judgment . The Electric Power Research Institute (EPRI ) HRA Calculator guides the user through the steps of any HRA analysis and allows the user to choose among analytical HRA methods . It applies Accident Sequence Evaluation Program (ASEP ) , Technique for Human Error Rate Prediction (THERP ) , the HCR /ORE Correlation , and the Caused Based Decision Tree Method (CBDTM ) . This program is intended to produce consistent results among different analysts provided that the initial information is similar . Even with this analytical approach , an HRA analyst must still render several judgments . The objective of this study was to evaluate the use of engineering judgment applied to the quantification of post -initiator actions using the HRA Calculator . The Comanche Peak Steam Electric Station (CPSES ) Level 1 Probabilistic Risk Assessment (PRA ) HRA was used as a database for examples and numerical comparison . Engineering judgments were evaluated in the following ways : 1 ) Survey of HRA experts . Two surveys were completed , and the participants provided a range of different perspectives on how they individually apply engineering judgment . 2 ) Numerical comparison among the three methods . 3 ) Review of CPSES HRA and identification of judgments and the effects on the overall results of the database . The results of this study identified thirteen areas in which an HRA analyst must interpret and render judgments on how to quantify a Human Error Probability (HEP ) and recommendations are provided on how current industry practitioners render these same judgments . The areas are : identification and definition of actions to be modeled , identification and definition of actions to be modeled , definition of critical actions , definition of cognitive portion of the action , choice of methodology , stress level , rule - , skill - or knowledge -based designation , timing information , training , procedures , human interactions with hardware , recoveries and dependencies within an action , and review of final HEP .
URI: http : / /hdl .handle .net /1969 .1 /3059
Date: 2006-04-12

Citation

Evaluation of the use of engineering judgements applied to analytical human reliablity analysis methods (HRA). Available electronically from http : / /hdl .handle .net /1969 .1 /3059 .

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