Document: NUREG-0800
Document ID: 74415b71-98a0-4109-9ba7-8a72a89a3d18
Document Type: srp
Title: ULTIMATE HEAT SINK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070520.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.5
CFR Part: 
CFR Title: 

Content:
heat due to decay of radioactive material, sensible heat, pump work, and the heat load from the operation of the station auxiliary systems serving and dependent upon the UHS. b. Operational data from plants of similar design confirm, where possible, the heat input values given for sensible heat, pump work, and station auxiliary systems. 2. The reviewer verifies that: DRAFT Rev. 3 - April 1996 9.2.5-8 a. The total essential station heat load and system flow requirements of the service water system are compatible with the heat rejection capability of the UHS. b. The UHS has the capability to dissipate the maximum possible total heat load, including LOCA under the worst combination of adverse environmental conditions including freezing, and has provisions for cooling the unit (or units, including LOCA for one unit for a multi-unit station with one heat sink) for a minimum of 30 days without makeup unless acceptable makeup capabilities can be demonstrated. This capability is verified by independent check calculations. c. The connecting channels, structures, manmade embankments and dams, and conduits to and from the UHS are capable of withstanding design basis natural phenomena in combination with other site-related events and that a single failure of any manmade feature resulting from such phenomena or events cannot prevent adequate cooling water flow or adversely effect the temperature of the water from the sink. d. The design of any dams, slopes, canals, or other water-control structures associated with the ultimate heat sink have provisions for inservice inspection and surveillance.41 e. The design provides for surveillance and control techniques to detect and control the incidence of flow blockage problems due to aquatic bivalves and other fouling due to mud, silt, or corrosion products, as recommended in Generic Letter 89-13 (Reference 12). The program for surveillance and control is reviewed by SPLB as indicated in subsection I of this SRP section.42 3. Plants