Document: NUREG-0800
Document ID: 50ab8154-2a3c-4c0f-8ce4-06ac83096e5c
Document Type: srp
Title: ULTIMATE HEAT SINK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550048.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.5
CFR Part: 
CFR Title: 

Content:
er), makeup sources to 9.2.5-2 Revision 3 - March 2007 the ultimate heat sink, and the capability of the heat sink to deliver the required flow of cooling water at appropriate temperatures for normal, accident, or shutdown reactor condition. The UHS is reviewed for whether the design code requirements that are pertinent to this review are met. The specific areas of review are as follows: 1. The type of cooling water supply. 2. The ability to dissipate the total essential station heat load. 3. The effect of environmental conditions on UHS capability to furnish the required quantities of cooling water at appropriate temperatures and with any required chemical and purification treatment for extended times after shutdown. 4. The effect of earthquakes, tornadoes, missiles, floods, and hurricane winds on the availability of the source water. The UHS is also reviewed for whether adverse environmental conditions including freezing preclude the UHS safety function. 5. Sharing of cooling water sources in multi-unit stations. 6. Applicable design requirements like the high- and low-water levels of the source to determine their compatibility with the service water system. 7. Heat input for the UHS design as to reactor system heat, sensible heat, pump work, and station auxiliary system individual and total heat loads. 8. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the staff reviews the applicant’s proposed ITAAC associated with the structures, systems, and components (SSCs) related to this SRP section in accordance with SRP Section 14.3, “Inspections, Tests, Analyses, and Acceptance Criteria.” The staff recognizes that the review of ITAAC cannot be completed until after the rest of this portion of the application has been reviewed against acceptance criteria contained in this SRP section. Furthermore, the staff reviews the ITAAC to ensure that all SSCs in this area of review are identified