Technical Basis and Implementation Guidelines for A Technique for Human Event Analysis (ATHEANA) (NUREG-1624, Revision 1)

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Date Completed: April 2000
Date Published: May 2000

Division of Risk Analysis and Applications
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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This report describes the most recent version of a second-generation human reliability analysis (HRA) method called "A Technique for Human Event Analysis," (ATHEANA), NUREG-1624, Rev. 1. ATHEANA is the result of development efforts sponsored by the Probabilistic Risk Analysis Branch in the U.S. Nuclear Regulatory Commission's (NRC)'s Office of Nuclear Regulatory Research. ATHEANA was developed to address limitations identified in current HRA approaches by providing a structured search process for human failure events and unsafe acts, providing detailed search processes for error-forcing context, addressing errors of commission and dependencies, more realistically representing the human-system interactions that have played important roles in accident response, and integrating advances in psychology with engineering, human factors, and PRA disciplines. The report is divided into two parts. Part I introduces the concepts upon which ATHEANA is built and describes the motivation for following this approach. Part 2 provides the practical guidance for carrying out the method. Appendix A provides retrospective ATHEANA-based analyses of significant operating events. Appendices B-E provide sample ATHEANA prospective analyses (HRAs) for four specific human performance issues.

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