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:
scribed in Section 9.3.1, "System Material Condition," of NEI 99-03 (Ref. 2). Licensees should perform testing to ensure they maintain CRH. Routine performance measurements are described in Regulatory Position 2.3.1. The complexity of testing following modifications should depend on the effect of the modification on CRH. DG-1115 (Ref. 9) provides a method for verification of CRE integrity. A frequency for CRE integrity testing is proposed in Regulatory Position 3 of Draft Regulatory Guide DG-1115. Regulatory Position 2.5 above provides a method and a suggested frequency to evaluate the impact of hazardous chemicals on control room operators. A proposed technical specification acceptable to the NRC staff that incorporates the above aspects of CRE integrity testing is contained in Appendix A to this guide. Appendix A provides proposed changes to the Westinghouse Standard Technical Specification (STS) 3.7.10 (Ref. 11), “Control Room Emergency Filtration System (CREFS),” and its associated bases. Similar changes to Babcox and Wilcox (B&W) STS 3.7.10 (Ref. 12), Combustion Engineering (CE) STS 3.7.11 (Ref. 13), General Electric (GE) Boiling Water Reactor (BWR) 4 STS 3.7.4 (Ref. 14), and GE BWR 6 STS 3.7.3 (Ref. 15) and their associated bases would be acceptable to the staff. A maintenance program should be established for the CRHS and the areas adjacent to the envelope. Table H-1 of NEI 99-03 (Ref. 2) should be used as guidance for developing a maintenance program. Guidance on air filtration and adsorption units of post-accident engineered-safety-feature atmosphere cleanup and normal atmospheric 10 cleanup system maintenance is provided in Regulatory Position 5 of Regulatory Guides 1.52 (Ref. 4) and 1.140, "Design, Inspection, and Testing Criteria for Air Filtration and Adsorption Units of Normal Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants" (Ref. 16). ASHRAE Guideline 1-1996 (Ref. 17) may be used to establish a maintenance program for systems