Document: NUREG-0800
Document ID: cee15d6b-ff87-4937-bd26-c31e9d4f6afd
Document Type: srp
Title: B-7
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550087.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
over the range of service conditions. Auxiliary features necessary to support protection system performance should meet all of the requirements of IEEE Std. 279-1971. Other auxiliary features that are part of the protection system, but not isolated from the protection system, should be designed to meet the criteria of IEEE Std. 279-1971 as necessary to assure that these components and systems do not degrade the protection systems below an acceptable level. SRP BTP 7-9 provides specific guidance for the review of anticipatory trips that are auxiliary features of a reactor protection system. The sharing of structures, systems, and components between units in multi-unit stations is permissible provided that the ability to simultaneously perform required safety functions in all units is not impaired. The review of shared displays and controls should be coordinated with the organization responsible for the review of human factors to confirm that shared user interfaces are sufficient to support the operator needs for each of the shared units. The organizations responsible for the review of electrical systems and balance of plant systems review power source requirements. Reviewers in the organization responsible for the review of I&Cs should coordinate with these organizations to confirm that I&C protection system power sources are adequate. The review of channel integrity should confirm that the design provides for protection systems to fail in a safe state, or into a state that has been demonstrated to be acceptable on some other defined basis, if conditions such as disconnection of the system, loss of energy, or adverse environments are experienced. This aspect is typically evaluated through evaluation of