Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
ms b and c above, the installation of fire suppression and detection equipment in a fire area should be sufficient to protect against the hazards of the area. In this regard, detection and suppression providing less than full area coverage may be evaluated as adequate to comply with the regulation (see Regulatory Position 1.8.3). Inside noninerted containments, the licensee should provide fire protection that meets the criteria above or as specified in Regulatory Position 6.1.1 of this guide. For this classification of equipment, there is no allowance for manual actions or methods other than combinations of the above options (see Regulatory Position 5.3.1.5 for the types of equipment included in this classification). For most plants licensed before January 1979, the methods described in Regulatory Position 5.3.1.2 are not available for the protection of the safe-shutdown success path without the approval of an exemption from 10 CFR 50.48(b) under 10 CFR 50.12. For pre-1979 licensees, a staff decision in an SER that approves the use of operator manual actions, in lieu of one of the means specified in Section III.G.2 of Appendix R, does not eliminate the need for an exemption. Pre-1979 licensees that have SERs, but not a corresponding exemption that approves operator manual actions, must request an exemption under 10 CFR 50.12, by citing the special circumstances of 10 CFR 50.12(a)(2)(ii), identifying the SER as the safety basis, and confirming that the safety basis established in the SER remains valid. Proceduralized actions taken by operators in the main control room to mitigate potential spurious actuations are not considered operator manual actions and are permitted. If permitted by the plant license, plants licensed after January 1979 may credit protection other than that described in items a, b, and c above (or Position 6.1.1 for inside noninerted containments), if DG-1359, Page 80 they can show that the use of the protection does not adversely affect safe