Document: NRC Regulatory Guide
Document ID: 8291b9eb-e4a7-4806-8b5b-1deca2ff1fe2
Document Type: regulatory_guide
Title: Control Room Habitability at Light-Water Nuclear Power Reactors
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0207/ML020790125.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.196
CFR Part: 
CFR Title: 

Content:
ethods when they perform these comparisons for other CRHS. 2.2.2 Interactions Between the CRE and Adjacent Areas The conditions that exist in the areas adjacent to the CRE influence the performance of the CRE and associated CRHSs. Although these systems might not be expected to operate during an emergency, during a loss of offsite power, or with a single failure, inleakage may be increased if they do operate. Potential interactions between the CRE and adjacent areas that may increase the transfer of contaminants to the CRE should be identified. These interactions may be caused by ventilation systems that supply or exhaust air from areas adjacent to the CRE, are located in areas adjacent to the CRE, or have ductwork that traverses the CRE or areas adjacent to the CRE. 2.3 Determination of Performance Characteristics 2.3.1 Performance of the CRE and CRH Ventilation Systems The licensee should determine the performance characteristics of the CRE, its ventilation systems, and systems that serve or traverse areas within or adjacent to the CRE. Performance characteristics are needed to: • Establish the operating parameters for incorporation into the licensing basis (for new reactors or those that have modified their CRE or associated ventilation systems), • Determine the impact on systems caused by changes in the operation, design, alignment, or procedures, • Define the limiting condition for the applicable design bases events, • Determine new limiting conditions or perform new analyses. Technical specifications require licensees to periodically perform measurements of several parameters important to maintaining CRH. These parameters may include system flow rates, carbon filter efficiencies, actuation signals, and CRE integrity tests. Engineered-safety-feature atmospheric clean up systems in light-water-cooled nuclear power plants should be tested and evaluated per Regulatory Guide 1.52, "Design, Inspection, and Testing Criteria for Air Filtration and Adsorption