Document: NUREG-0800
Document ID: 2b97cac0-236e-4362-b454-56126b369173
Document Type: srp
Title: B-8
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A091.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
ons 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 the applicant’s or licensee’s failure modes and effects analysis. The analysis should justify the acceptability of each failure effect. The RTS functions should typically fail in the tripped state. ESFAS functions should fail to a predefined safe state. For many ESFAS functions this predefined safe state will be that the actuated component remains as-is.