Document: NUREG-0800
Document ID: f58c1aee-14cf-4909-b99e-6a9548723b23
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 PIPING SYSTEMS, PIPING COMPONENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1233/ML12334A376.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.12
CFR Part: 
CFR Title: 

Content:
gue Analyses Incorporating the Life Reduction of Metal Components due to the Effects of the Light-water Reactor Environment for New Reactors,” provides guidance for use in determining the acceptable fatigue life of ASME Class 1 piping, with consideration of the light-water reactor (LWR) environment. viii. Fatigue Evaluation of ASME Code Class 2 and 3 Piping The acceptance criteria provided in Section III of the ASME Code are applicable. 3.12-10 Draft Revision 1 - June 2013 ix. Thermal Oscillations in Piping Connected to the RCS As described in NRC Bulletin (BL) 88-08, the applicant should identify and evaluate any connected, unisolable piping that could be subjected to temperature stratification or oscillation. If the design is susceptible to such stratification or oscillation, the application should describe a program meeting the criteria in BL 88-08 to provide continuing assurance that this piping will not be subjected to unacceptable thermal stresses. x. Thermal Stratification BL 79-13 identified the potential for cracks from thermal fatigue in pressurized water reactor feedwater lines, generally induced by stresses from thermal stratification during cold, low-flow feedwater injections. The applicant should identify whether the feedwater system design is susceptible to this cracking. If the design is susceptible, the application should describe a program for performing the inspections noted in BL 79-13, Revision 2, as applicable to designated applicants for operating licensees. BL 88-11 identified the potential for stresses induced by thermal stratification in the pressurizer surge line. The applicant should demonstrate that fatigue and stresses associated with thermal stratification and thermal striping have been considered in the piping analyses that demonstrate compliance with applicable code limits. In addition, the applicant should describe a monitoring program to verify that the extent of thermal stratification, thermal striping, and piping deflections