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
CFR Part: 
CFR Title: 

Content:
time available relative to this criterion during the Phase 1 analysis. 18.0-20 Draft Revision 3 – July 2015 • The initial MCR operating staff size and composition assumed for the analysis of time required is the same as the minimum MCR 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: 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 10 CFR Part 52 process and as a result, may 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 analysis. 2.A. Method The preliminary validation should provide independent confirmation of the validity of the “time required” estimate