Approach to improving PRA by identifying and quantifying errors of commission and dependency during LP S

Conference · Fri Jan 01 04:00:00 EST 1993 · Transactions of the American Nuclear Society; (United States)

OSTI ID:6958923

Luckas, W J; Brown, W S ^[1]; Wreathall, J ^[2]; Cooper, S E ^[3]; Bley, D C ^[4]

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1. Brookhaven National Lab., Upton, NY (United States)
2. John Wreathall and Co Inc., Dublin, OH (United States)
3. SAIC, Reston, VA (United States)
4. PLG Inc., Newport Beach, CA (United States)

Human reliability analysis (HRA) is an integral part of probabilistic risk assessments (PRAs). Although various approaches and methods have been proposed since the first HRA was performed as part of the Reactor Safety Study (WASH-1400) almost two decades ago, the technology associated with HRA is still not fully developed. The limitations of the existing HRA approaches become particularly important when the role of the human is examined in the context of nuclear power plants (NPPS) during low-power and shutdown (LP S) conditions. Evaluations of events that have occurred during LP S have indicated that human activities and performance play a much larger role in shutdown than during full-power operations. During LP S conditions, the normal power operation configuration is altered substantially so that there is less automated control. As a result, control of the NPP unit is maintained almost entirely by human interaction. To properly account for the increase of human interactions in a PRA of LP S operations, it is necessary for an improved HRA methodology to be developed and integrated into the PRA process. In response to this need, an analysis of operational experience during LP S was performed to determine the critical factors that contribute to human performance, and a program plan for research was developed to improve existing HRA methodologies and provide a more realistic and justifiable model of human reliability for future PRAs.

• OSTI ID: 6958923
• Report Number(s): CONF-931160--
• Conference Information: Journal Name: Transactions of the American Nuclear Society; (United States) Journal Volume: 69
• Country of Publication: United States
• Language: English

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