Document: NUREG-0800
Document ID: 757f66f9-1dd5-4125-9970-089087134ad9
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0905/ML090510170.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1.1
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Content:
sign and testing of the separation barriers; the approach when full separation is not feasible; the method of verifying that the separation barrier is installed and maintained properly; and the method of verifying that the as-built cable routing provides the separation necessitated by the design. 6.2 Aspects of New Reactor FPPs that Reduce Fire Risk The overall maturity of fire protection regulation, nuclear plant operation, and analysis methods and the opportunity to incorporate the benefits in the original plant design will greatly enhance new reactor plant safety. The following aspects of the new reactor FPPs will also enhance post- fire plant safety and should be considered by the staff when reviewing license applications: a. The enhanced fire protection concept and fully-separated 4-train design reduce the safety significance of fire detection/suppression systems, fire brigade response, and other aspects of the FPP for the areas of the plant where the enhanced level of fire protection is provided. b. Where the plant=s design includes an additional safe-shutdown train to ensure safe- shutdown capability when one train is out for maintenance (i.e., there are at least three 100%-capacity redundant trains) and one train fails due to fire, the maintenance downtime for any one train is likely to be a small percentage of total operating time. Consequently, there may be a high probability that even with loss of one train from fire, an extra train beyond the minimum required for safe shutdown will be available. c. Since the fire protection regulations are being incorporated in the original design rather than being backfitted to existing plants, use of the plant change process should be greatly reduced, which should reduce the potential risk increases due to changes. d. Post-fire, safe-shutdown circuit analysis should be greatly simplified, reducing the potential for errors. e. Full train separation should significantly reduce security concerns associated with a fire by