Document: NUREG-0800
Document ID: 51b93b24-7bff-4144-949f-36812854b7aa
Document Type: srp
Title: HUMAN FACTORS ENGINEERING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1612/ML16125A114.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18.0
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Content:
o Fire.” 3 ANSI/ANS 58.8, “Time Response Design Criteria for Safety-Related Operator Actions,” provides an acceptable task decomposition methodology for this purpose. However, the time intervals described in ANSI/ANS 58.8 were validated using analog controls and; therefore, may not be accurate for this application. 18.0-20 Revision 3 – December 2016 Guidance on Uncertainty and Use of Experts,” or “Eliciting and Analyzing Expert Judgment: A Practical Guide, Cambridge University Press,” 1991). Prior experience with tasks or subtasks similar to the actions proposed to be credited in the analysis may provide valuable insights for the analysis/estimates of operator response times. Operating experience data used to provide input to the analysis/estimates of operator response times should be supplemented with information about the similarities and differences between the credited actions and the actions identified in the operating experience. The analysis should demonstrate that there is adequate time margin between the time available and time required which considers and accounts for any uncertainty inherent to the analysis (see example: Section 4.2.2 of NUREG 1852, Demonstrating the Feasibility and Reliability of Operator Actions in Response to Fire”). This uncertainty could reduce the level of assurance and potentially invalidate a conclusion that operators can perform the action reliably within the time available. One acceptable method is for the time margin to equal the maximum recovery time for any single credible4 operator error. The basis for the specific time margin used in the analysis should be justified and documented. Insights from the HFE program, especially the operating experience review (OER) and human reliability analysis, should be used. The identification of potential errors, error detection methods, and error recovery paths in event trees may be used to provide estimates of how much margin should be added to the operator response time