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:
a t which upper-shelf toughness i s effective. These results should correspond to minus two sigma values for KIc and KIa, plus two sigma values for RTNDT, and plus two sigma values for the copper and nickel contents as well as plus two sigma for the fluence value. These curves, which graphically represent the worst-case condition for each transient of interest, will be used i n the evaluation of the critical time interval from the initiation of the transient during which mitigating action can occur. 6. INTEGRATION OF ANALYSES - I n t h i s chapter, the event frequencies are coupled with the results o f the fracture mechanics analysis t o obtain an integrated frequency o f vessel through- wall cracking due t o PTS. An example o f one acceptable method i s presented i n Chapter 6 o f Reference 3. A table t h a t supplies the following information f o r each specific sequence and residual group i d e n t i f i e d i n Section 3.5 should be provided. These results are t o be provided f o r the operating time a t which the reactor w i l l reach the PTS screening c r i t e r i o n and f o r any additional operation 1 i f e bei ng requested: O Sequence identification. O Type o f i n i t i a t o r (smal 1-break LOCA with low decay heat, large steamline break a t f u l l power, etc.). O Estimated sequence frequency. O Method used t o determine conditional through-wal 1 crack penetration probabi 1 i ty. O Sequence conditional through-wal 1 crack penetration probabi l i ty." O Frequency o f through-wall cracking due t o sequence obtained by the product o f sequence frequency and sequence conditional through-wall crack penetration probabi 1 i ty. For each dominant sequence, a section o r table should be provided t h a t sup- p l i e s (1) specific reference t o the graph o f temperature, 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