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:
History Method Follow the review procedures provided in SRP Section 3.9.2, Subsection III.2. v. Inelastic Analyses Method Follow the review procedures provided in SRP Section 3.9.1, Subsection III.4. vi. Small Bore Piping Method Follow the review procedures provided in SRP Section 3.9.2, Subsection III.2. vii. Nonseismic/Seismic Interaction (II/I) Follow the review procedures provided in SRP Section 3.9.2, Subsection III.2.K. 3.12-17 Revision 1 – April 2014 viii. Category I Buried Piping Follow the review procedures provided in SRP Section 3.7.3, Subsection III.12. B. Piping Modeling Technique i. Computer Codes Follow the review procedures provided in SRP Section 3.9.1, Subsection III.2. ii. Dynamic Piping Model Follow the review procedures provided in SRP Section 3.9.2, Subsection III.2. iii. Piping Benchmark Program Under the benchmark program NRC staff constructed a series of piping systems mathematical models, which are representative of typical piping designs. These models were used as an input to computer stress analysis programs. These models were analyzed using approved dynamic analysis methods and representative loads. The results obtained by the applicant’s analysis (using its own computer program) are compared with NRC’s results. For each benchmark problem, modal frequencies, maximum pipe moments, maximum support loads, maximum equipment nozzle loads, and maximum deflections should meet the range of acceptable values specified in the NRC benchmark program. iv. Decoupling Criteria Review the analyses of the piping systems that provide support to other piping systems. In developing mathematical models for the analyses, the reviewer should limit the size of the model by decoupling small branch lines from larger run lines. For cases where smaller piping is supported by larger piping, there are two methods to evaluate this condition. Either a coupled dynamic model of the entire piping system is performed or the piping system is assumed to be broken up