Document: NUREG-0800
Document ID: a8dee0cd-6529-4ac9-b659-26bda40aba48
Document Type: srp
Title: INFORMATION SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B138.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.5
CFR Part: 
CFR Title: 

Content:
oom. The staff finds that the bypass indications will give the operators timely information and status reports so the operators can mitigate the effects of unexpected system unavailability. The bypass indications satisfy the guidelines of RG 1.47. Therefore, the staff concludes that the BISI functions satisfy the applicable requirements of 10 CFR 50.55a(h) and 10 CFR 50.34(f)(2)(v). The staff reviewed the control room annunciator systems and finds that these systems are sufficiently reliable to support normal and emergency plant operations. Redundant annunciator systems are provided and the independence of these redundant systems complies with the independence requirements of IEEE Std 603-1991, Clause 5.6. Alarms provided for manually controlled actions for which no automatic control is provided and that are required for the safety systems to accomplish their safety functions comply with the guidance of IEEE Std 603-1991. Therefore, the staff concludes that the annunciator systems satisfy the guidance of the SRM on SECY-93-087, Item II.T, General Design Criteria 13 and 19. Based on the above items, the staff finds that the information systems satisfy the requirements of GDC 13 for monitoring variables and systems over their anticipated ranges for normal operation, for anticipated operational occurrences, and for accident conditions. Further, the staff finds that conformance to GDC 13 and the applicable guidelines satisfies the applicable requirements of GDC 19 with respect to information systems provided in the control room from which actions can be taken to operate the unit safety under normal conditions and to maintain it in a safe condition under accident conditions. The safety parameter display system, the information systems associated with the emergency response facilities, and the emergency response data system, nonsafety portions of accident monitoring instrumentation, nonsafety portions of BISI, and nonsafety portions of the annunciator systems are