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
CFR Part: 
CFR Title: 

Content:
gulatory Issue Summary 2002-22. 26. U.S. Nuclear Regulatory Commission, “Use of Design Acceptance Criteria during 10 CFR Part 52, Design Certification Reviews,” SECY 92-053. 18.0-18 Revision 3 – December 2016 Attachment A Guidance for Evaluating Credited Manual Operator Actions INTRODUCTION This attachment defines a methodology, applicable to both existing and new reactors, for evaluating manual operator actions which an applicant proposes as a means for performing, or supporting the performance of, a function important to plant safety. This attachment is based largely on, and replaces, the guidance provided in Chapter 18, Appendix 18- A, Crediting Manual Operator Actions in Diversity and Defense-In-Depth Analyses, Rev. 0. It has been written to be generically applicable to the evaluation of manual operator actions BACKGROUND This procedure provides generic guidance for reviewing credited manual operator actions. For some applications additional specific guidance is available. These sources are listed below. In general, the more immediate the need for an operator action the more detailed the evaluation of the action will be. No time limit has been established beyond which an operator action need not be evaluated because of the diversity of conditions that can potentially affect the successful accomplishment of operator actions. STAFF POSITION Credited operator actions should be demonstrated to be both feasible and reliable, given the time available, and that the ability of operators to perform credited actions reliably will be maintained for as long as the manual actions are necessary to satisfy the analysis assumptions. The time available for manual actions should be based upon the methods and criteria prescribed within the analysis crediting the operator action. The time required for the operator action should be estimated and validated using the guidance of this attachment. To demonstrate that the manual actions are both feasible and reliable, and that the