Document: NUREG-0800
Document ID: 93a26deb-9fac-4f56-a0c6-8addc960a55b
Document Type: srp
Title: ASME CODE CLASS 1, 2, AND 3 PIPING SYSTEMS, PIPING COMPONENTS AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0700/ML070040002.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.12
CFR Part: 
CFR Title: 

Content:
the Certification of the Advanced Boiling Water Reactor Design, Section 3.1.1.2.” 1Regulatory Guide 1.207 was issued for comment July 2006. Regulatory Guide 1.207 is being developed concurrent with the development of this SRP section. 3.12-10 March 2007 xv. Welded Attachments Support members, connections, or attachments welded to piping should be designed such that their failure under unanticipated loads does not cause failure at the pipe pressure boundary. The applicant may use Code Cases for the design of the welded attachments. Acceptable Code Cases are listed in RG 1.84. xvi. Modal Damping for Composite Structures The acceptance criteria provided in SRP Section 3.7.2, Subsection II.13 are applicable. xvii. Temperature for Thermal Analyses The applicant should perform thermal expansion analyses for piping systems that operate at temperatures above or below the stress-free reference temperature. The stress-free reference temperature for a piping system is typically defined as a temperature of 70°F. The applicant should provide justification if thermal expansion analyses are not performed. The justification will be reviewed on a case by case basis. xviii. Intersystem LOCA The acceptance criteria for the design of the piping system should be such that over pressurization of low-pressure piping systems due to RCPB isolation failure will not result in rupture of the low-pressure piping outside containment. The criteria provided in Staff Requirements Memoranda (SRM) dated June 26, 1990 in response to Commission Papers (SECY)-90-016 dated January 12, 1990 are applicable. xix. Effects of Environment on Fatigue Design The guidance provided in Regulatory Guide 1.2071 is applicable. D. Piping Support Design The piping system supports must provide adequate margins of safety to maintain the functionality of the piping components under all combinations of loadings. i. Applicable Codes The design of ASME Code, Section III, Class 1, 2, and 3, piping supports should comply