Document: NUREG-0800
Document ID: 96afb1d6-6ce9-41e4-b4ec-1fc7747bc0b2
Document Type: srp
Title: Revision 8 – January 2021
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A647.pdf
Revision Date: 2023-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
onsistent with the plant’s licensing basis, and safety and protection functions have the highest priority when common resources are used. The commands to actuate components resulting from safety and protection are always performed over other functions. 3.2.2 Crediting Manual Operator Action When addressing point 3, the applicant may credit a manual operator action as a diverse means to accomplish the same or a different function credited in the D3 assessment or to mitigate spurious operation. To be creditable, manual operator actions should be performed within a time frame adequate to effectively mitigate the event. In addition, a human factors evaluation process, such as the process outlined in SRP Chapter 18, should show that the proposed manual operator action is both feasible and reliable. The reviewer may use a risk-informed approach to determine the appropriate level of HFE review needed for proposed changes to existing credited manual actions or for proposed new manual operator actions. The reviewer should consider whether the equipment necessary to perform these actions, including the supporting indications and controls, is diverse from (i.e., not vulnerable to the same sources of CCF as) the equipment performing the same function within the safety-related I&C system. If the equipment used to perform the credited manual operator action is NSR, then the applicant should demonstrate that the equipment is of adequate quality—for example, by applying the alternative treatment requirements in 10 CFR 50.69 or the ATWS quality assurance guidance in GL 85-06. If the applicant proposed the use of equipment outside the MCR to perform the credited manual operator action, the reviewer should consider whether this equipment is vulnerable to the same CCF as the safety system and whether the applicant demonstrated that the equipment will be BTP 7-19-27 Revision 8 – January 2021 reliable, available, and accessible under the postulated event conditions. The reviewer