Document: NUREG-0800
Document ID: 644c1fee-247e-4265-9466-5876937a7120
Document Type: srp
Title: INFORMATION SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550086.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.5
CFR Part: 
CFR Title: 

Content:
les monitored and the range and accuracy of instrumentation provided to monitor these variables is consistent with the severe accident analysis. Therefore, the staff finds that the accident monitoring instrumentation meets the applicable requirements of GDC 13 and 19. The accident monitoring instrumentation includes the following functions required by 10 CFR 50.34(f): feedwater system flow indication, accident monitoring instrumentation, inadequate core cooling instrumentation, instruments for monitoring plant conditions following core damage, central reactor vessel water level recording. Additionally, the 7.5-12 Revision 5 - March 2007 power supply for the accident monitoring instrumentation pressurizer level indication complies with the requirements of 10 CFR 50.34(f)(xx). Therefore, the staff concludes that the instrumentation systems important to safety satisfy the applicable requirements of 10 CFR 50.34(f), Subparts xii, xvii, xviii, xix, xx, and xxiv. The staff reviewed the systems for which a bypassed or inoperable status is indicated in the control room. 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 Regulatory Guide 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