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:
should be assumed t o be located a t the inner surface o f the vessel and should extend through the cladding t o the inner surface o f the vessel. Reference 20 provides a comprehensive discussion o f recommendations f o r input distributions t o be used i n probabi 1 i s t i c fracture mechanics calculations. 4. A l l regions o f the b e l t l i n e should be considered. This includes axial and circumferential welds as well as the base material. The f o l low - K ~ c - - K ~ a - where T = Val 1 temperature R T ~ ~ ~ o = I n i t i a l n i l - d u c t i l i t y reference temperature Exampl = Increase i n n i l - d u c t i l i t y reference temperature due t o radiation damage, f(Cu,Ni,fluence). I f plant surveillance data meet the c r i t e r i a f o r c r e d i b i l i t y given i n Reference 27, they may be used as described therein. es o f these functions are described i n References 3 and 27. I n reporting the results, the methods used f o r the p r o b a b i l i s t i c vessel- i n t e g r i t y analysis should be described, t h e i r limitations f o r t h i s analysis identified, and the impact o f uncertainties i n the resulting vessel f a i l u r e probabilities estimated. Discussion o f the analysis should include a l i s t i n g of the assumptions used, t h e i r bases, and a discussion o f the s e n s i t i v i t y o f the results t o variations i n the assumptions. Vessel dimensions and material properties used should be given. For each transient of interest, a deterministic analysis that includes a i set of critical crack-depth curves as functions of time (see Refs. 1, 2, and 3), i - e . , a plot of crack depths corresponding to initiation and arrest events versus L time, should be carried out. This plot should also have curves indicating the depth of crack 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