Document: NUREG-0800
Document ID: 4a295d6b-937a-429e-8fe4-1470b992d859
Document Type: srp
Title: Rev. 0 – November 2009
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0929/ML092950353.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18
CFR Part: 
CFR Title: 

Content:
ed generic technical guidelines for emergency operating procedure development, or plant-specific EOPs, depending on the maturity of the design) that achieves the credited operator response in the time available. The documented sequence of operator actions should be analyzed at a level of detail necessary to identify critical elements of the actions and performance shaping factors (e.g., workload, time pressure) that affect time 18-A-4 Rev. 0 – November 2009 required and likelihood of successful completion of the action sequence. The vendor/ licensee/applicant should establish time estimates for individual task components (e.g., acknowledging an alarm, selecting a procedure, verifying that a valve is open, starting a pump) and the basis for the estimates, through a method applicable to the human-system interface (HSI) characteristics of digital computer-based I&C. Acceptable methods for deriving analysis time estimates for individual task components include, but are not limited to: • Operator interviews and surveys • Operating experience reviews • Software models of human behavior, such as task network modeling • Use of control/display mockups • Expert panel elicitation1 • ANSI/ANS 58.8, “Time Response Design Criteria for Safety-Related Operator Actions”2 Methods that are dependent on expert judgment to derive time estimates for task components are potentially subject to bias. In addition, the uncertainties associated with estimates derived through these methods are difficult to quantify. Accordingly, these methods should be employed using structured approaches that minimize bias and help identify and assess uncertainties (see example: NUREG/CR-6372, “Recommendations for Probabilistic Seismic Hazard Analysis: 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