Document: NUREG-0800
Document ID: 7916b088-fb90-4163-84fe-027bd315bcc5
Document Type: srp
Title: REVIEW OF RISK INFORMATION USED TO SUPPORT PERMANENT PLANT-
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700658.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.2
CFR Part: 
CFR Title: 

Content:
levated temperatures and/or elevated pressure differentials). If the proposed change does not directly affect steam generator tube integrity, and the steam generators in the plant are not experiencing significant degradation, only a qualitative analysis may be needed to ensure that the risk of ISGTR is not significantly increased by the proposed change. However, if the plant has suffered a steam 19.2-61 June 2007 generator tube rupture, or has been shut down because of excessive steam generator tube leakage, or has detected tubes that do not meet applicable ASME Code requirements for structural integrity, or has repaired a significant amount of tubes as a result of free span degradation, the application should provide a more thorough analysis of the effects of the proposal on the risk associated with ISGTR. Containment Isolation: • Whether the proposed change affects systems that perform or support the isolation function. • Whether the proposed change affects systems that prevent or mitigate core damage sequences initiated during periods of reduced containment functionality (e.g., shutdown). • Whether the proposed change affects the ability to restore containment function during such periods (e.g., AC power, plant procedures). Igniters: • Whether the proposed change affects the igniters or any applicable support systems. ECC Restoration Before Vessel Failure: • If credit was taken in the estimate of LERF for recovery of cooling before vessel failure, whether the proposed change affects performance of any system thus credited (including support systems). • Whether the proposed change affects other accident management strategies credited in the PRA (e.g., external vessel flooding). RCS Pressure at Vessel Failure: • Whether the proposed change affects the capability to depressurize the RCS. Venting: • Whether the proposed change affects the capability to vent the containment. Containment Heat Removal: • Whether the proposed change affects systems