Document: NUREG-0800
Document ID: c3ba2b86-3805-4144-9775-cd35b7bffe2d
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16084A884.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
ion air intake and exhaust system • equipment and floor drainage system 2, 3 • feedwater system 4 • main steam system 4 • pressurizer power-operated relief valves (PORVs) (including associated components and block valves) 3 • process and post-accident sampling systems 4 • reactor auxiliary cooling water systems (e.g., component cooling water and essential chilled water systems) 2 • reactor coolant system • refueling water storage system 2 • residual heat removal system • spent fuel pool cooling and cleanup system 2, 5 1 For some plants this system may be nonsafety-related, providing it is quality group classified consistent with the positions of RG 1.26. 2 Only portions of the system that perform a safety-related function are subject to quality group classification. 3 See Appendix A for supplemental classification guidance. 4 Only portions of the system inside containment, up to and including the outermost containment isolation valve, are subject to quality group classification. 5 Includes makeup water systems as described in SRP Section 9.1.3. 3.2.2-10 Revision 3 – July 2016 • station service water system 2 • steam generator blowdown system 4 • ultimate heat sink and supporting systems 3 • ventilation systems for areas such as control room and engineered safety features rooms 3 Boiling-Water Reactor Fluid Systems Subject to Quality Group Classification • combustible gas control system 3 • compressed air system 1, 2, 3 • condensate storage system 2 • control rod drive hydraulic system 2 • containment cooling system • containment isolation system 3 • emergency core cooling systems • emergency diesel engine fuel oil storage and transfer system 3 • emergency diesel engine cooling water system • emergency diesel engine starting system • emergency diesel engine lubrication system • emergency diesel engine combustion air intake and exhaust system • equipment and floor drainage system 2, 3 • feedwater system (up to