Document: NUREG-0800
Document ID: 6237521d-c825-4ed6-8fb7-7b3b8019a3fc
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070297.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Mechanical Engineering Branch (EMEB)1 Secondary - None 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. The EMEB reviews the applicant's classification system for pressure-retaining components such 2 as pressure vessels, heat exchangers, storage tanks, pumps, piping, and valves in fluid systems important to safety, and the assignment by the applicant of quality groups to those portions of systems required to perform safety functions. Where required, specific information or assistance may be required from the ICSB to review electrical and instrumentation systems needed for functioning of plant features important to safety. This review which is coordinated with each branch that has primary review responsibility for these plant features is performed for both construction permit (CP) and operating license (OL) applications. Excluded from this review 3 are: structures; internal parts of mechanical components such as shafts, seals, impellers, packing, and gaskets; fuel, electrical, and instrumentation systems, electrical valve actuation devices, and pump motors. The applicant presents data in histhe safety analysis report (SAR) in the form of a table which 4 identifies the fluid systems important to safety; the system components such as pressure vessels, heat exchangers, storage tanks, pumps, piping, and valves; the associated quality group DRAFT Rev. 2 - April 1996 3.2.2-2 classification, applicable ASME Code and code class (see Reference 15) ; and the quality 5 6 assurance requirements. In addition, the applicant presents, on suitable piping and instrumentation diagrams, the system quality group classifications. 7 Review Interfaces8 The EMEB also performs the following reviews forunder the SRP sections indicated: 9 10 1. Determines the acceptability of the