Document: NUREG-0800
Document ID: 9e12eef7-842c-43db-9170-12cf365ca8b9
Document Type: srp
Title: PIPING SYSTEMS AND COMPONENTS - INSPECTIONS, TESTS, ANALYSES,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660622.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.3
CFR Part: 
CFR Title: 

Content:
ower when the detailed design is complete and performance characteristics of the facility are known. Although applicants for design certification should propose designating similar Tier 2* information to that in the DCDs for the evolutionary designs, the NRC bears the final responsibility for designating which material is Tier 2*. The basis for the use of Tier 2* should be discussed in the staff's safety evaluation report. The Tier 2* information is discussed further in Appendix A to SRP Section 14.3. Regulations, Codes and Standards. The use of codes and standards in the certified design material (CDM) should be minimized with exceptions granted case by case. Instead, the applicable requirements from the regulations, codes, or standards should be stated in the CDM, rather than reference them. This ensures that the requirement is clear, and allows flexibility if the reference changes. References to various parts of ASME Sections III and XI may verify issues like pressure boundaries or pre-service inspection requirements. Also, references to 10 CFR Part 20 may be required for radiation protection. The specific code edition, volume, version, date, etc., should be specified in the site safety analysis report 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. 2. Verifications of Components and Systems. In addition to the generic approach to piping design in Tier 1, the verification of piping and component classification, fabrication, dynamic and seismic qualification, and selected testing and performance requirements is also addressed by specific ITAAC in the individual Tier 1 systems. A. Piping and Component Safety Classification. 10