Document: NUREG-0800
Document ID: 69433f0d-1a24-4cf6-b8b9-31109f9f51c5
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190014.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
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 reducing access needs. f. Extensive use of fiber optics should greatly reduce the likelihood of hot shorts and spurious actuations - this development is particularly significant in the control room where full separation of trains is not possible. g. Use of fiber optics also reduces the fire area combustible loadings and thus the challenge to fire barriers. 9.5.1-19 Revision 5 - March 2007 h. The enhanced fire protection approach should greatly reduce the importance and scope of fire protection issues that are contentious for existing reactors such as operator manual actions and multiple spurious actuations. i. The concept of alternative/dedicated shutdown systems, widely used in current reactors, should be virtually eliminated for new reactors (except for a control room or containment fire). j. Enhanced fire