Document: NUREG-0800
Document ID: dac334d4-585f-42f5-bde4-118e876f5d4c
Document Type: srp
Title: PIPING SYSTEMS AND COMPONENTS (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070660.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.3
CFR Part: 
CFR Title: 

Content:
sion, date, etc., should be specified in the SSAR, rather than Tier 1. This provides for specific requirements that are acceptable, yet allows the code to be updated via the change process in the rule certifying the design. It is important to note that, due to the provisions of 10 CFR 52.63 and the rule certifying the design, changes to the codes and standards in 10 CFR 50.55a would not necessarily be requirements for the certified design. Verifications of Components and Systems In addition to the generic approach to piping design in Tier 1 described above, the verification of piping and component classification, fabrication, dynamic and seismic qualification, and selected testing and performance requirements are also addressed by specific ITAAC in the individual Tier 1 systems, as discussed below. PIPING AND COMPONENT SAFETY CLASSIFICATION General Design Criterion 1 of 10 CFR Part 50, Appendix A requires that SSCs important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed. Nuclear power plant components classified as Quality Groups A, B, and C are required by 10 CFR 50.55a to meet the requirements for ASME Code Class 1, 2, and 3, respectively. Therefore, the safety classification of SSCs should be described in each system's design description, and the functional drawings should identify the boundaries of the ASME Code classification that are applicable to the safety class. The ASME Code classes in the ASME Code, Section III, allow a choice of rules that provide assurance of structural integrity and quality commensurate with the relative importance assigned to the individual items of the nuclear power plant. The ASME Boiler and Pressure Vessel Code class requirements may be verified by either a generic piping design ITAAC as described above, or by each system ITAAC. The use of other codes and standards (e.g., AISC Steel Construction Manual for building structural