Human Performance Study Reportssee "AEOD" above. US. Nuclear Regulatory Commission, Office of Executive Director of Operations (EDO), SECY-94-219, SECY-95-079, and SECY-95-126see "SECY" above. U.S. Nuclear Regulatory Commission, Regional Office, Augmented Inspection Team (AIT) Reportssee " AIT" above. WASH-1400 (NUREG 75/014), Reactor Safety Study-An Assessment of Accident Risks in U.S.

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Recent nuclear power plant events (e.g., Chernobyl, Diablo Canyon, and Vogtle) and U.S. Nuclear Regulatory Commission (NRC) reports (e.g., NUREG-1449) have led to concerns regarding human reliability during low power and shutdown (LP&S) conditions and limitations of human reliability analysis (HRA) methodologies in adequately representing the LP&S environment. As a result of these concerns, the NRC initiated two parallel research projects to assess the influence of LP&S conditions on human reliability through an analysis of operational experience at pressurized water reactors (PWRs) and boiling water reactors (BWRs). These research projects, performed by Brookhaven National Laboratory for PWRs, and Sandia National Laboratories for BWRs, identified unique aspects of human performance during LP&S conditions and provided a program plan for research and development necessary to improve existing HRA methodologies. This report documents the results of the analysis of LP&S operating experience and describes the improved HRA program plan.

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Within the context of the NRC charter to ensure adequate protection of the public health and safety, the common defense and security, and the environment in the use of nuclear materials in the United States, the mission of NRC activities concerning human reliability assessment and human performance evaluation is to ensure effective regulation and oversight of licensee personnel performance. Five general strategies for achieving the mission are listed below.

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The staff of nine group homes volunteered to participate in this study. Although they shall remain anonymous to respect the privacy of their residents, we offer our sincere appreciation to all the staff involved in supplying the data and to the administrators who allowed the group homes to participate. V7ithout the cooperation and patience of these individuals, this investigation would not have been possible. Thanks also to Jennifer Gagnon, Barbara Stanton, and James Cole whose assistance in data reduction was invaluable in the preparation of this report. And lastly, thanks to Kim Leaman and Bonnie Matteson for their secretarial support. iii