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:
to meet the seismic classification guidelines of Regulatory Guide 1.27. 4. Reactor sites that utilize large natural or manmade water sources which for all practical purposes have an infinite supply of water are reviewed as described in items 1 and 2 above, and in addition the reviewer determines: a. By evaluation of the SAR information or independent calculations that the water source is adequate taking into account the effects of design basis natural phenomena such as tornadoes, hurricane winds, probable maximum floods, tsunamis, seiches, and the SSE. b. By reviewing the SAR preliminary site and plant arrangement sketches (CP) and site drawings and plant arrangement drawings (OL) that the design of the intake and outlet conduits (open or closed type) are properly separated to prevent recirculation or water temperature stratification. c. That manmade earth dam, dike, or other structure design bases in the SAR include requirements for withstanding the design basis natural phenomena or combinations of such phenomena at historically observed intensities. In the event of failure of a dam, dike, or other structure not designed to withstand the design basis natural phenomena (particularly the SSE), sufficient water must remain in the source pool to assure ensure a cooling water supply for a minimum of 30 days, with adequate cooling capability so that the required cooling water temperature to the service water system inlet is not exceeded. 5. As indicated in subsection I of this SRP section, the review of seismic design is performed by SEBECGB and the review for seismic and quality group classification is 43 performed by MEBEMEB.44 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including inspections, tests, analysis, and acceptance criteria (ITAAC), site interface requirements and