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:
omulgated. During this time, proposed GDCs (sometimes called "Principal Design Criteria") were published in the Federal Register for comment. These proposed GDCs addressed CRH. Although facilities may have been licensed before the promulgation of the GDCs, licensees may have committed to the form of the GDCs as they existed at the time of licensing. A review of the record associated with the construction permit and OL proceedings should confirm whether licensees made such a commitment. Therefore, licensees that received their construction permits or OLs before the GDCs were promulgated should review their commitments to the draft form of the GDC to understand their CRH licensing bases. For facilities licensed following the issuance of this regulatory guide, the sources for the description of the licensing bases are likely to be the documents filed in support of the licensing application (under 10 CFR Parts 50 and 52). 6 2.2 Determination of Whether the CRHSs are Consistent with the Licensing Bases 2.2.1 Comparison of System Design, Configuration, and Operation with the Licensing Bases Licensees should compare the design, configuration, and operation of their CRHSs and the systems that are in adjacent areas and could interact with the CRE to their licensing bases to ensure consistency. The review of the configuration of the CRHSs should include the construction and the alignment of the systems and structures that make up the CRHSs. For new reactors and existing CRHSs undergoing redesign, this comparison should be made upon completion of construction. Section 5 of NEI 99-03 (Ref. 2) provides a method of comparing the plant's configuration and operations of ventilation systems with the licensing bases that is acceptable to the NRC staff. Licensees should employ similar methods 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