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
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CFR Title: 

Content:
tween time available and time required for operator action decreases, there is increasing potential that uncertainty in the estimate of difference between these times will invalidate a conclusion that operators can perform the actions reliably within the time available. Preliminary validation results that are unacceptable to the NRC reviewer(s) should result in modification of the defense-in-depth coping strategy. Modification of the defense-in-depth coping strategy will require re-analysis, re-validation and re-submittal for NRC staff review. PHASE 3: INTEGRATED SYSTEM VALIDATION This section describes the attributes of an acceptable method for conducting an ISV of manual operator actions that are to be credited in a defense-in-depth analysis. 6 The preliminary validation results should provide high confidence that the performance time criteria will be met in the Phase 3, ISV. Unacceptable ISV results will require modification of the defense-in-depth coping strategy late in the design and licensing process. 18-A-9 Final Revision 0 – April 2014 3.A. Method ISV is an evaluation using performance-based tests to determine whether an integrated system design (i.e., hardware, software, procedures, training, staffing and qualification, and physical environment) meets performance requirements and acceptably supports safe operation of the plant. The vendor/licensee/applicant should conduct an ISV of manual actions credited in the defense-in-depth analysis using a plant-referenced simulator in real time. Using the validation guidance in NUREG-0711, the vendor/licensee/applicant should measure operator response times (performance times) of all operating crews in representative event simulations, i.e., AOO/PAs with concurrent software CCF. Performance times should be compared to the time available (per defense-in-depth analysis results) and previous estimates of time required. The digital I&C system timing analysis results in support of determining the time available should