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:
ciated components should be classified as safety-related where necessary to perform a safety-related function (e.g., mitigation of a design-basis steam generator tube rupture accident, low temperature overpressure protection of the reactor vessel, and/or plant cooldown as described in Generic Letter 90-06). As described in Reference 12, the safety-related classification should address redundant and diverse control systems designed to seismic Category I criteria and those improvements that were imposed subsequent to the TMI-2 accident, such as criteria to be powered from Class 1E buses and to provide valve position indication in the control room. The PORVs and block valves should be included within a quality assurance program that is in compliance with 10 CFR Part 50, Appendix B. For PWR plants licensed prior to the revision date of this SRP section and whose PORVs were not constructed as safety-grade components, these components should be addressed in accordance with the positions specified in Generic Letter 90-06, Enclosure A, Section 3.1. (9) RG 1.143 describes a method acceptable for complying with regulations regarding radwaste management systems, including guidance for classification and quality assurance measures. Position C.1.1 and Table 1 of the Regulatory Guide describe codes and industry standards applicable to the design and fabrication of radwaste management systems. In addition, the Regulatory Guide describes positions with regard to the design and fabrication of these systems that are supplemental to those established by the codes and standards cited. RG 1.143 does not explicitly specify classifications for radwaste management system components in terms of the quality groups (A-D) described in RG 1.26. 3.2.2-17 Revision 2 - March 2007 Table A-1 (continued) (10) RG 1.151 describes an acceptable method for the design and installation of safety-related instrument sensing lines, including the application of another standard in addition to the ASME Code.