Document: NRC Regulatory Guide
Document ID: da2e0703-3488-44b0-b6d0-089aac7cae3d
Document Type: regulatory_guide
Title: Format and Content of Plant-Specific Pressurized Thermal Shock Safety Analysis Reports for Pressurized Water Reactors
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740028.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.154
CFR Part: 
CFR Title: 

Content:
rature, pressure, and flow as provided i n Chapter 4, "Thermal-Hydraulic Analysisn; (2) a time-line description o f the accident sequence noting important operator actions, control actions, protection system actions, equipment faults, and vessel f a i l ure; and (3) fre- quency of through-wall crack penetration as a function o f fluence o r RTNDT- Results should then be summed within each i n i t i a t o r type t o provide a fre- quency o f through-wall crack penetration as a function o f i n i t i a t o r type. The discussion should explain why each i n i t i a t o r type i s or i s not impor- t a n t t o PTS. Finally, the results should be summed over a l l i n i t i a t o r types t o provide an integrated frequency o f through-wall cracking f o r the vessel. This inte- grated value should be reported as a function o f fluence, or RTNDTy and p l o t t e d with uncertainty values as determined i n Chapter 7, "Sensitivity and Uncertainty Analyses o f Through-Wall Crack Frequency," and included on the p l o t . The dis- cussion should i d e n t i f y important operator actions, control actions, and p l a n t features t h a t can cause o r prevent vessel failure. he conditional through-wall crack penetration probability i s the probability of a through-wall crack as determined by the fracture mechanics analysis, given t h a t the event occurs. 7. SENSITIVITY AND UNCERTAINTY ANALYSES OF THROUGH-WALL CRACK FREQUENCY I n order f o r the results o f the probabilistic analysis t o be useful f o r regulatory decisionmaking, the s e n s i t i v i t y o f the results t o input parameters and assumptions should be determined, the major sources o f uncertainty should be identified, and the magnitude o f the uncertainty should be estimated. I n t h i s chapter, the results and the procedures used t o perform each o f these processes are t o be documented. A good example i s given i n Chapter 7 o f Reference 3. Portions o f t h a t analysis, or other analyses, may be referenced i