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
CFR Part: 
CFR Title: 

Content:
otential bias in the estimates increases. Accordingly, the vendor/applicant should use several diverse methods to estimate operator response times to maximize the cross-validation value of the methods (i.e., minimize the potential for bias and reduce sources of uncertainty in the estimates of operator response times). For example, when the design has advanced to the point where a part-task simulator is available, the vendor/applicant should use it to cross-validate previous time estimates derived from other activities, such as expert elicitation, tabletop analysis, or walkthrough/talkthrough. It is expected that the vendor/applicant will estimate operator response time using as realistic an environment as is available at the time of the preliminary validation. The group of individuals who conduct the preliminary validation of the analysis should not include individuals who conducted the analysis. Independence between these groups will help to ensure that any undocumented assumptions and analytical methods used in the analysis are identified and documented during the analysis. However, it is recognized that communication between the groups will be necessary, especially after the preliminary validation is complete. The processes of validation and design are iterative and feedback from the preliminary validation should be used to refine the design, the procedures, and the training provided to the operators. The preliminary validation should be rigorous and conducted by operators, system technical experts, and human factors experts. These personnel should verify that the analysis is logical for its purpose, contains a sufficient level of detail, and that the analyzed action sequence presents no physical or spatial difficulty for performance. The language and the level of 4A suitable part-task simulator is one of demonstrated scope and fidelity sufficient for the conduct of the specific validation. 18-A-7 Rev. 0 – November 2009 information presented in the documented