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:
r 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 shutdown. Positions 5.3.1.2, 5.3.1.3, and 5.3.1.4 below present additional ways of demonstrating adequate protection. The omission or elimination of these capabilities in an area containing SSCs (including circuits) important to safety may be considered an adverse effect on safe shutdown, since it would reduce, at a minimum, fire protection defense in depth. Where safe shutdown would be adversely affected because of a reduction in the protection discussed above, the licensee should submit a license amendment to the NRC for review and approval. The approach outlined in Chapter 4 of NEI 00-01, Revision 4, which relies on the Expert Panel Process and the Generic List of Multiple Spurious Operations contained in Appendices F and G to that document, provides an acceptable methodology for the identification of multiple spurious actuations that may affect safe-shutdown success path SSCs, when applied in conjunction with this RG. Spurious actuations, either single or multiple, with the potential to affect safe-shutdown success path components should be mitigated in accordance with the features described in this section; tools such as fire modeling and manual actions should not be used. 5.3.1.2 Protection for Components Important to Safe Shutdown The protection options described in Regulatory Position 5.3.1.1 are available but not required for the protection of SSCs (including circuits) important to safe shutdown. Additional protection options available for this category are, for example, operator manual actions (Position 5.3.1.3) and fire modeling (Position 5.3.1.4). These additional options are not available for safe-shutdown success path equipment without prior NRC approval (Position 5.3.1.1). The approach outlined in Chapter 4 of NEI 00-01, Revision 4, which relies on the