Document: NUREG-0800
Document ID: 85a8d3b1-a30b-4282-8217-8bc68986145a
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/ML1404/ML14042A513.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.12
CFR Part: 
CFR Title: 

Content:
ay justify a 0.125-inch gap, but smaller-diameter piping systems will need smaller gaps to provide adequate support. 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 applies to following type of pipe supports: limit stops, snubbers, rods, hangers, and sway struts. In the analysis of the support, the applicant should confirm that the loading on the support is within an acceptable range based on the manufacturer’s design limits for the specific support. xiv. Clamp-induced Local Pipe Stress Evaluation If stiff pipe clamps of the type identified in Information Notice (IN) 83-80 and Generic Safety Issue (GSI) 89 (as described in NUREG-0933, “Resolution of Generic Safety Issues”) are used in the design, the clamp design should be evaluated to ensure that the local pipe stresses induced by the clamp are included in the combination of stresses in the piping analysis. 3.12-14 Revision 1 – April 2014 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 require 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