Document: NUREG-0800
Document ID: 743c65f7-fe56-43cc-8658-f69bb64672dc
Document Type: srp
Title: Final Revision 0 – April 2014
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1311/ML13115A156.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18
CFR Part: 
CFR Title: 

Content:
ection describes the attributes of an acceptable method for preliminarily validating the time required to take manual operator actions that are credited in a defense-in-depth analysis. Note: Licensees upgrading existing operating 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 (10 CFR) Part 52 process and as a result, would not have achieved the level of design development necessary to validate the operator manual actions by conducting an ISV prior to the time the staff must issue a safety evaluation applicable to the defense-in-depth analysis. 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 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 suitable5 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 (i.e., minimize the 5A suitable part-task simulator is one of demonstrated scope and fidelity sufficient for the conduct of the specific validation. 18-A-7 Final Revision 0 – April 2014 potential for bias and reduce sources of uncertainty in the estimates of operator response times). For