Document: NUREG-0800
Document ID: 51b93b24-7bff-4144-949f-36812854b7aa
Document Type: srp
Title: HUMAN FACTORS ENGINEERING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1612/ML16125A114.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18.0
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use of all applicable procedure(s). This could involve implementation of a single procedure, multiple procedures in parallel, or procedures in sequence.5 Where applicable the review should address the possibility that use of symptom/function-based EOPs may be necessary (e.g., instances in which event diagnosis may be particularly challenging). • The initial operating staff size and composition assumed for the analysis of time required is the same as the minimum staff defined in the plant’s Technical Specifications. • If credited manual actions require additional operators beyond the Technical Specification minimum crew, the justification for timely availability of the additional staffing is provided and the estimate of time required includes any time needed 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. Communications, travel time, and work environment are addressed. • The analysis identifies a time margin between the time required and time available to perform the action and documents the basis for the adequacy of the margin, including consideration of the uncertainty in the estimation of the margin. PHASE 2: PRELIMINARY VALIDATION This section describes the attributes of an acceptable method for preliminarily validating the time required for credited manual operator actions. Note: Preliminary validation is a recommended practice for licensees implementing complex modifications and applicants for design certifications. 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 design or operating strategy late in the