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
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d for calling in additional personnel. • The analysis of the action sequence is conducted at a level of detail sufficient to identify individual task components, including cognitive elements such as diagnosis and selection of appropriate response, and the associated performance shaping factors that affect time required and the potential for operator error. • The analysis identifies a time margin to be added to the time required and the basis for the adequacy of the margin. PHASE 2: PRELIMINARY VALIDATION This section describes the attributes of an acceptable method for preliminarily validating the time required to take manual operator actions that are credited in a D3 analysis. 18-A-6 Rev. 0 – November 2009 Note: Licensees upgrading existing plants may skip this phase and go directly to Phase 3, Integrated System Validation (ISV). A preliminary validation is only required for those vendors/applicants who are using the Title 10 of the Code of Federal Regulations, Part 52 (10 CFR Part 52) process. 2.A. Method The preliminary validation should provide independent confirmation of the validity of the “time required” estimate derived in the Phase 1 Analysis through the use of diverse methods such as the following: • Tabletop analysis • Walkthrough/talkthrough analysis • Software models of human behavior, such as task network modeling • Use of control/display mockups • Man-in-the-loop prototype testing • Pilot testing • Real-time validation on a suitable4 part-task simulator Note: The preceding list is not all-inclusive – other validation methods may be used if sufficient technical justification is provided. As the difference between time available and time required for operator action decreases, the importance of reducing uncertainty and minimizing potential bias in the estimates increases. Accordingly, the vendor/applicant should use several diverse methods to estimate operator response times to maximize the cross-validation value of the methods