Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
nt procedures, etc.). 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: 0 Whether the proposed change affects the capability to depressurize the RCS. SRP 19-A23 Venting: 0 Whether the proposed change affects the capability to vent the containment. Containment Heat Removal: Whether the proposed change affects systems credited in containment heat removal (including front-line and support systems). * Whether the proposed change affects the frequency or severity of ATWS sequences. For each of the above considerations that apply, reviewers should ascertain that the licensee adequately evaluated the effects and took them into account in calculating the change in LERF. c. Evaluation Findings The safety evaluation report should contain findings equivalent to the following. The calculation for the change in LERF resulting from a proposed change has systematically taken into account the dominant causes of containment failure. In particular, the calculation has considered: bypass sequences; sequences posing relatively severe challenges to containment, or sequences occurring during periods of reduced containment functionality (shutdown); performance of systems involved in containment safety 1-unctions, including containment heat removal, sprays, isolation, and restoration of containment functionality (shutdown); and performance of systems involved in accident management strategies. A. 11 Bibliographv This section provides a list of documents of that the staff could use as reference or background material during the review process. This