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:
e state; the reviewer should consider whether all safe states were described in the priority scheme. Acceptance Criteria If the acceptance criteria below are met, the reviewer should conclude that the application includes a D3 assessment justifying the use of an existing plant system as a diverse means. The existing system may perform the same function as that disabled by the postulated CCF, or it may perform a different function to compensate for or mitigate the loss of the disabled function. The acceptance criteria are as follows: a. If NSR equipment is used in the diverse system, the equipment is of sufficient quality to BTP 7-19-26 Revision 8 – January 2021 perform the necessary function(s) during the associated event conditions. Sufficient quality can be achieved, for example, through application of the alternative treatment requirements developed for implementation of 10 CFR 50.69 or the ATWS quality assurance guidance set forth in GL 85-06. b. Sufficient diversity exists between the diverse system and the proposed system, so that they are not subject to the same postulated CCF. c. The equipment to be credited has functional capabilities sufficient to maintain the plant within the acceptance criteria defined in the FSAR or the LAR for the limiting events applicable to the proposed DI&C system or component. d. The LAR maintains the existing system’s licensing basis in view of the new credited use, or the LAR identifies and analyzes those parts of the existing system’s licensing basis being updated as a result of the proposed change. e. If prioritization is used, the new use of the credited system maintains the existing prioritization scheme. If the new use of the existing system results in changes to the existing prioritization scheme, the changes are consistent 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