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Simplified Human Reliability Analysis Process for Emergency Mitigation Equipment (EME) Deployment

For a variety of different reasons, it is becoming more common for nuclear power plants to incorporate the use of portable equipment, for example, mobile diesel pumps or power generators, in their accident mitigation strategies. In order for the Probabilistic Risk Assessment (PRA) to reflect the as-built, as-operated plant, it is necessary to include these capabilities in the model. However, current Human Reliability Analysis (HRA) methodologies that are commonly used in the nuclear power industry are not designed to accommodate the evaluation of some of the tasks associated with the use of portable equipment, such as retrieving equipment and making temporary power and pipe connections. This paper proposes a method for estimating the component of the human error probability (HEP) associated with the deployment of portable equipment. The other components of the HEP, such as the failure to identify the need to initiate portable equipment deployment, can be addressed with existing methodologies and are not addressed by this approach. This approach is intended for application to a variety of hazard risk assessments, including internal events, internal flooding, high winds, internal fires, external flooding, and seismic events.