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:
REVIEW RESPONSIBILITIES Primary - Organization responsible for mechanical engineering reviews Secondary - Organizations responsible for the review of component performance and testing I. AREAS OF REVIEW Nuclear power plant systems and components important to safety should be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety function to be performed. Described herein is an acceptable deterministic approach to classify fluid systems important to safety and identify their applicable construction codes and standards depending on the system or component function and relative importance to safety. An alternative approach identified in 10 CFR 50.69 is a risk-informed categorization process that applies industry guidelines for categorizing Systems, Structures, and Components (SSCs) according to a risk-informed safety class. The risk-informed approach described in Regulatory Guide (RG) 1.176 and RG 1.201 is optional and subject to the limitations of 10 CFR 50.69. Successful application of an acceptable risk-informed categorization approach depends on a high quality PRA and an approved method to assign applicable codes and standards. Considering that RG 1.201 currently is to be used only as interim guidance for trial use and that an acceptable risk-informed method to assign applicable codes and standards to a risk- informed safety class does not exist, this SRP section does not include criteria for reviewing a risk-informed categorization approach. The specific areas of review are as follows: 3.2.2-2 Revision 2 - March 2007 1. The applicant's classification system for pressure-retaining components such as pressure vessels, heat exchangers, storage tanks, pumps, piping, and valves in fluid systems important to safety, and the applicant’s assignment of quality groups to those portions of systems necessary to perform safety functions. Excluded from this review are: structures; internal parts of mechanical components