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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red for operator action decreases, there is increasing potential that uncertainties in the estimate of time required 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 D3 coping strategy. Modification of the D3 coping strategy will require re-analysis, re-validation and re-submittal for NRC staff review. If a successful manual action strategy cannot be achieved, diverse automation is required. 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 D3 analysis. 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 D3 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 licensed operating crews in representative event simulations, i.e., AOO/PAs with concurrent software CCF. Performance times should be compared to the time available (per D3 analysis results) and previous estimates of time required. The digital I&C system timing analysis results in support of determining the time available should be validated as necessary by testing on integrated digital I&C systems and components. In selecting personnel for event simulations, consideration should be given to the assembly of both nominal and minimum crew configurations, including shift supervisors, reactor operators, shift technical advisors, etc., that will