Technical Basis and Implementation Guidelines for a Technique for Human Event Analysis (ATHEANA)
NUCLEAR REGULATORY COMMISSION ROCKVILLE MD OFFICE OF NUCLEAR REGULATORY RESEARCH
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This report introduces a next-generation HRA method called A Technique for Human Event Analysis, ATHEANA. ATHEANA was developed to address limitations identified in current HRA approaches by 1 addressing errors of commission and dependencies 2 more realistically representing the human-system interactions that have played important roles in accident response and 3 integrating advances in psychology with engineering, human factors, and PRA disciplines. This report is the step-by-step guidebook for applying the method. It describes how to 1 select and organize the ATHEANA team, 2 perform and control the structured search processes for human failure events and unsafe acts, including a discussion of the reasons that such events occur i.e., the elements of error-forcing context, 3 use the knowledge encoded in the PRA along with the specialized knowledge and experience of the ATHEANA team to focus the searches on those events and reasons that are most likely to affect the risk, and 4 quantify the error-forcing contexts and probability of each unsafe act, given its context.
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