Document: NRC Regulatory Guide
Document ID: 3df13dae-14ee-4f25-95b4-1cedf617ae15
Document Type: regulatory_guide
Title: Regulatory Guidance on the Alternate Pressurized Thermal Shock Rule + HISTORY - HISTORY 03/2015 – DG-1299 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1405/ML14056A011.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.230
CFR Part: 
CFR Title: 

Content:
for nondestructive examination (NDE) that are intended to provide reasonable assurance that the distribution of flaws assumed to exist in the PFM calculations that provided the basis for the fracture resistance limits defined in 10 CFR 50.61a (defined in terms of RTMAX-X values) provide an appropriate, or bounding, model of the population of flaws in the RPV of interest. Position 3 of this document provides guidance by which licensees can satisfy these criteria. 4. Criteria relating to alternate limits on embrittlement. The Alternate PTS Rule provides embrittlement criteria in the form of RTMAX-X limits, as specified in Table 1 of 10 CFR 50.61a. Position 4 of this document describes an alternate procedure by which licensees can assess their plant-specific through-wall cracking frequency (TWCF) for cases where the RTMAX-X limits are not met. Further details and the technical background associated with the guidance provided in this document may be found in NUREG-2163, “Technical Basis for Regulatory Guidance on the Alternative PTS Rule, (10 CFR 50.61a)” (Ref. 5). Harmonization with International Standards The NRC staff reviewed guidance from the International Atomic Energy Agency and did not identify any standards that provided useful guidance to NRC staff, applicants, or licensees. DG-1299, Page 4 Documents Discussed in Staff Regulatory Guidance This regulatory guide endorses, in part, the use of one or more codes or standards developed by external organizations, and other third-party guidance documents. These codes, standards and third-party guidance documents may contain references to other codes, standards or third-party guidance documents (“secondary references”). If a secondary reference has itself been incorporated by reference into NRC regulations as a requirement, then licensees and applicants must comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a regulatory guide as an acceptable approach for