Document: NRC Regulatory Guide
Document ID: 46049842-54a7-40a0-a0cc-ab115059f05e
Document Type: regulatory_guide
Title: Ultimate Heat Sink for Nuclear Power Plants + HISTORY - HISTORY DG-1275 , Proposed Revision 3, published 09/2013 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1304/ML13043A624.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.27
CFR Part: 
CFR Title: 

Content:
discharge the cooling water well away from the nuclear power plant to ensure that there is no potential for plant flooding by the discharged cooling water, unless it can be demonstrated that there is extremely low probability that a single canal (aqueduct) or piping system can functionally fail as a result of natural or site-related phenomena. b. All water sources and their associated canals (aqueducts) or piping systems should be highly reliable and separated and protected so that failure of any one will not induce failure of any other. DG-1275, Page 11 4. Technical Specifications The technical specifications for the plant should include provisions for actions to be taken if conditions threaten partial loss of the capability of the UHS or the plant temporarily does not satisfy Regulatory Positions 1 through 3 during operation (e.g., UHS water temperature, UHS water volume). 5. In-Service Testing, Maintenance, and Performance Testing a. A routine inspection and maintenance program should be established for the UHS system piping, structures, and components. This program should be able to detect corrosion, erosion, protective coating failure, silting, and bio-fouling so that degradation can be identified and corrective action can be taken before the performance of the safety-related systems is negatively impacted. b. Both the initial pre-service test program and the periodic in-service test program should encompass those safety-related heat exchangers that are connected to the UHS and required for the UHS to perform its nuclear safety-related functions. c. Performance testing of the UHS heat exchangers should be performed in accordance with ASME OM-2009, “Operation and Maintenance of Nuclear Power Plants,” Part 21, “In-service Performance Testing of Heat Exchangers in Light Water Reactor Power Plants” (Ref. 14), or an equivalent test method. d. Where a dam or other water-controlling structure is required to ensure that the UHS has sufficient water available