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:
efficient will be reviewed on a case by case basis. 3.12-12 March 2007 xi. Pipe Support Gaps and Clearances Small gaps are generally provided for frame type supports. The gap allows for radial thermal expansion of the pipe and for pipe rotation. This gap must account for the diametrical expansion of the pipe due to temperature and pressure. The acceptance criteria for the minimum gap (total of opposing sides) between the pipe and the support and will be reviewed on a case by case basis. xii. Instrumentation Line Support Criteria The acceptance criteria provided in ASME Code, Section III, Subsection NF are applicable. xiii. Pipe Deflection Limits The allowable deflections of the piping at support locations resulting from design loadings should be controlled to ensure that the pipe deflections do not cause the failure of the supports. This criteria will be reviewed on a case by case basis. This criteria applies to following type of pipe supports: limit stops, snubbers, rods, hangers, and sway struts. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. 10 CFR 50.55a and GDC 1 requires that SSCs be designed, fabricated, constructed, tested, and inspected to quality standards commensurate with the importance of the safety function to be performed. SRP Section 3.12. provides guidance for the staff's review of loading conditions, stresses, and stress limits for the piping systems, piping components and their associated supports. Loading conditions and stress limits are described in this SRP section, and ASME Code, Section III, Division 1, Subsection NF. SRP Section 3.12 also provides guidance for the staff's review of interfacing issues such as design specifications, mechanical properties, and testing, as appropriate. SRP Section 3.9.3 provides related guidance on component supports as well as the installation of pressure relief devices.