Identifying Human Failure Events (HFEs) for External Hazard Probabilistic Risk Assessment

Al-Douri, Ahmad; Levine, Camille S; Groth, Katrina M

Identifying Human Failure Events (HFEs) for External Hazard Probabilistic Risk Assessment

dc.contributor.advisor	Groth, Katrina M
dc.contributor.author	Al-Douri, Ahmad
dc.contributor.author	Levine, Camille S
dc.contributor.author	Groth, Katrina M
dc.date.accessioned	2022-08-01T16:40:19Z
dc.date.available	2022-08-01T16:40:19Z
dc.date.issued	2022-06
dc.description.abstract	In recent years, several advancements in nuclear power plant (NPP) probabilistic risk assessment (PRA) have been driven by increased understanding of external hazards, plant response, and uncertainties. However, major sources of uncertainty associated with external hazard PRA remain. One source discussed in this study is the close coupling of physical impacts on plants and overall plant risk under hazard events due to the significant human actions that are carried out to enable plant response and recovery from natural hazards events. This makes human reliability and human-plant interactions important elements in to consider in enhancing PRA to address external hazards. One of the challenges in considering human responses is that most existing human reliability analysis (HRA) models, such as SPAR-H and THERP, were not developed for assessing ex-control room actions and hazard response. To support this new scope for HRA, HRA models will need to be developed or modified to support identification of human activities, causal factors, and uncertainties inherent in external hazard response, thereby providing insights regarding event timing and physical event conditions as they relate to human performance. In this study, the first step of such work is performed by identifying human failure events (HFEs) for human response to flooding hazards. These HFEs are human actions or inactions that are involved in human response to flooding hazards and could contribute to the loss of a critical function for the plant in the scenario being examined. Several resources are used to identify these HFEs, including flooding reports from the Nuclear Regulatory Commission (e.g. NUREG/CR-7256: Effects of Environmental Conditions on Manual Actions for Flood Protection and Mitigation), interviews with experienced PRA and HRA analysts, and tabletop walkdowns of flooding scenarios with a project team. Also, task decomposition analyses using the cognitive-based Phoenix HRA model are also used to identify HFEs. This paper will discuss early results of these analyses.	en_US
dc.description.sponsorship	Department of Energy, Office of Nuclear Energy, Award Number DE-NE0008974	en_US
dc.identifier	https://doi.org/10.13016/jhqm-qzpv
dc.identifier.citation	Ahmad Al-Douri, Camille S. Levine, and Katrina M. Groth. Identifying human failure events (HFEs) for external hazard probabilistic risk assessment. PSAM 16, 2022.	en_US
dc.identifier.uri	http://hdl.handle.net/1903/29082
dc.language.iso	en_US	en_US
dc.relation.isAvailableAt	A. James Clark School of Engineering	en_us
dc.relation.isAvailableAt	Mechanical Engineering	en_us
dc.relation.isAvailableAt	Digital Repository at the University of Maryland	en_us
dc.relation.isAvailableAt	University of Maryland (College Park, MD)	en_us
dc.subject	human reliability analysis, human failure event, external hazards, reliability	en_US
dc.title	Identifying Human Failure Events (HFEs) for External Hazard Probabilistic Risk Assessment	en_US
dc.type	Article	en_US