Document: NUREG-0800
Document ID: 4ae4fdd9-3c00-4bbd-8ed8-caac69daf3a5
Document Type: srp
Title: describes the general procedures to be followed in reviewing any instrumentation and control
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500507.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
upon this review, the Staff finds that the redundancy requirements of GDC 34, 35, 38, 41, and 44 have been met. The review included the identification of those systems and components for the interlock systems that are designed to survive the effects of earthquakes, other natural phenomena, abnormal environments, and missiles. Based upon the review, the Staff concludes that the applicant/licensee has identified those systems and components consistent with the design bases for those systems. Sections 3.10 and 3.11 of the SER address the qualification programs to demonstrate the capability of these systems and components to survive these events. Therefore, the Staff finds that the identification of these systems and components satisfies the requirements of GDC 2 and 4. The Staff reviewed the bypassed or inoperable status indication of safety interlocks. The Staff finds that appropriate bypass indications are provided to give the operators timely information and status reports so the operators can mitigate the effects of unexpected system unavailability. The bypass Rev. 4 — June 1997 SRP 7.6-6 indications satisfy the guidelines of Reg. Guide 1.47. Therefore, the Staff concludes that the safety interlock systems satisfy the applicable requirements of 10 CFR 50.55a(h) and 10 CFR 50.34(f)(2)(v). The non-safety interlock systems are appropriately isolated from safety systems. Therefore, the staff concludes that the isolation of these systems from safety systems satisfies the requirements of 10 CFR 50.55a(h) and the requirements of GDC 24. Based on the review of interlock safety system design, the Staff concludes that the safety portions of the interlock systems comply with the requirements of [ANSI/IEEE Std 279 OR IEEE Std 603]. Therefore, the Staff finds that the interlock safety systems satisfy the requirements of 10 CFR 50.55a(h). In the review of the interlock systems, the Staff examined the dependence of this system on the availability of essential auxiliary systems.