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
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CFR Title: 

Content:
and components for information systems important to safety designed to survive the effects of earthquakes, other natural phenomena, abnormal environments, and missiles. Based on the review, the staff concludes that the applicant or 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 applicable requirements of General Design Criteria 2 and 4. The nonsafety portions of information systems important to safety are appropriately isolated from safety systems, including the safety portions of the information systems. Therefore, the staff concludes that the isolation of these systems from safety systems satisfies the applicable requirements of 10 CFR 50.55a(h) and the requirements of GDC 24. The instrumentation provided for monitoring severe accident conditions has been designed to operate in the severe accident environment for which it is intended and over the time span for which it is needed. Therefore, the staff finds that the severe accident monitoring instrumentation satisfies the applicable requirements of General Design Criteria 2 and 4. The accident monitoring instrumentation conforms to the guidelines for the instrumentation to access plant conditions during and following an accident provided in RG 1.97. The redundant information systems conform to the guidelines for the physical independence of electrical systems provided in RG 1.75, “Criteria for Independence of Electrical Safety Systems.” The instrument spans and EOP action points were established in accordance with the guidelines of RG 1.105. The environmental monitoring system provided to protect the safety instrument sensing lines from freezing conforms to the guidelines of RG 1.151, “Instrument