Document: NUREG-0800
Document ID: 2ab6f47e-1578-451d-b6ad-29434e31a72b
Document Type: srp
Title: SYSTEM QUALITY GROUP CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340619.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.2
CFR Part: 
CFR Title: 

Content:
nes. Changes in quality group classification are permitted normally only at valve locations, with the valve assigned the higher clas- sification. A change in quality group classification with no valve present is permitted only when it can be demonstrated that the safety function of the system is not impaired by a failure on the lower-classification side of the boundary. The following fluid systems important to safety for pressurized water reactor (PWR) and boiling water reactor (BWR) plants are reviewed by the MEB with regard to quality group classification. FLUID SYSTEMS IMPORTANT TO SAFETY FOR PWR PLANTS I Reactor Coolant System Emergency Core Cooling System Containment Spray System Chemical and Volume Control System Boron Thermal Regeneration System1'2 Boron Recycle System1'2 Residual Heat Removal System Component Cooling Water System2 Spent Fuel Pool Cooling and Cleanup System2 Sampling System 2 Service Water System2 Compressed Air System" 2 Emergency Diesel Engine Fuel Oil Storage and Emergency Diesel Engine Cooling Water System Emergency Diesel Engine Starting System Emergency Diesel Engine Lubrication System Emergency Diesel Engine Combustion Air Intake Main Steam System3 Feedwater System3 Auxiliary Feedwater System Steam Generator Blowdown System3 Containment Cooling System Containment Purge System Transfer System ! and Exhaust System I 3.2.2-3 Rev. 1 - July 1981 Ventilation Systems for Areas such as Control Room and Engineered Safety Features Rooms Combustible Gas Control System Condensate Storage System' FLUID SYSTEMS IMPORTANT TO SAFETY FOR BWR PLANTS Reactor Recirculation System Main Steam System (up to but not including the turbine) Feedwater System (up to outermost containment isolation valve or shutoff valve, as applicable) Relief Valve Discharge Piping Control Rod Drive Hydraulic System2 Standby Liquid Control System Reactor Water Cleanup System Fuel Pool Cooling and Cleanup System2 Sampling System3 Residual Heat Removal System High Pressure Core