Document: NUREG-0800
Document ID: eedf1a7c-578e-463a-9608-b06af6312cf1
Document Type: srp
Title: HUMAN FACTORS ENGINEERING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1310/ML13108A095.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18.0
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CFR Title: 

Content:
eam with the knowledge and skills necessary to verify the rigor and assumptions of the analysis and validate the analysis conclusions regarding the ability of operators to perform the actions reliably within the time available. • The preliminary validation uses methods appropriate to assessing time required for the task. For complex situations and for actions with limited margin, such as less than 30 minutes between time available and time required, the preliminary validation uses two or more methods to validate the analysis. The preliminary validation results support the conclusion that the time required, including margin, to perform individual steps and the overall documented sequence of manual operator actions is reasonable, realistic, repeatable, and bounded by the Phase 1 analysis documentation.7 Note: As the difference between 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. 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. 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 licensee/applicant should conduct an ISV of credited manual actions using a plant-referenced simulator in real time. Using the validation guidance in NUREG-0711, the 7 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