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:
o implement safe shutdown as appropriate (see Regulatory Position 5.5 of this guide). 1.4 Fire Test Reports and Fire Data The licensee should evaluate fire reports and data (e.g., fire barrier testing results and cable derating data) that are used to demonstrate compliance with NRC fire protection requirements to ensure that the information is applicable and representative of the conditions for which the information is being applied. NFPA 251, “Standard Methods of Test of Fire Resistance of Building Construction and Materials” (Ref. 41), recommends that test conditions be evaluated carefully, because variations from the construction of the test specimen or from the condition in which it is tested may substantially change the performance characteristics of the tested assembly. Not all possible configurations of fire barrier assemblies can be tested; Regulatory Positions 1.8.3 and 4.3 of this guide provide additional information on evaluating installed configurations that deviate from tested conditions. 1.5 Compensatory Measures The licensee may implement compensatory measures for degraded and nonconforming conditions. In its evaluation of the impact of a degraded or nonconforming condition on plant and individual SSC operation, a licensee may decide to implement a compensatory measure as an interim step to restore operability or to otherwise enhance the capability of SSCs important to safety until the final corrective action is complete. Reliance on a compensatory measure for operability should be an important consideration in establishing the timeframe for completing the corrective action. Conditions that require interim compensatory measures to demonstrate operability should be resolved more promptly than conditions that are not dependent on compensatory measures to show operability; such reliance suggests a greater degree of degradation. Similarly, if an operability determination is based on operator action, the licensee should resolve the nonconforming