Document: NUREG-0800
Document ID: 8238d583-b5fc-4a78-9cf3-4407f130bbbd
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190003.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
1 components of light-water-cooled reactors important to safety that are part of the RCPB. The detailed review of these components is conducted by the reviewer under other SRP sections as described in subsection I. These components are designated in RG 1.26 as Quality Group A. In addition, RG 1.26 identifies, on a functional basis, water- and steam- containing components of those systems important to safety that are designated as Quality Groups B and C. Quality Group D applies to water- and steam-containing components of systems that are less important to safety. An applicant may use the NRC Group Classification system identified in RG 1.26 or, alternately, the corresponding American Nuclear Society (ANS) classification system of Safety Classes if they are cross-referenced with the classification groups in RG 1.26. There are also systems of light-water-cooled reactors important to safety that are not identified in RG 1.26 for which there are established staff positions regarding quality group classification. These systems, and references establishing their acceptable classifications, are identified in Appendix A. 2. The information supplied in the application identifying fluid systems important to safety is reviewed for completeness, and the quality group classification, ASME Code and code class, and quality assurance criteria of each individual major component are checked for compliance with the above criteria. The various modes of system operation are checked to ensure that the assigned NRC quality groups are acceptable. 3. The piping and instrumentation diagrams are reviewed to ensure that the applicant has delineated in detail the system quality group classification boundaries for systems 3.2.2-6 Revision 2 - March 2007 important to safety. Changes in quality group classification are considered to be acceptable normally only at valve locations, with the valve assigned the higher classification. A change in quality group classification with no valve present is