Document: NUREG-0800
Document ID: ec8e8c49-ea1e-4b46-a508-500ea11caad2
Document Type: srp
Title: ULTIMATE HEAT SINK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350549.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.5
CFR Part: 
CFR Title: 

Content:
nomena or combinations of such phenomena at historically observed intensities. In the event of failure of a dam, dike, or other struc- ture not designed to withstand the design basis natural phenomena 9.2.5-5 Rev. 2 - July 1981 (particularly the SSE), sufficient water must remain in the source pool to assure a cooling water supply for a minimum of 30 days, with adequate cooling capability so that the required cooling water tempera- ture 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 SEB and the review for seismic and quality group classification is performed by MEB. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and his review supports conclusions of the following type, to be included in the staff's Safety Evaluation Report: The ultimate heat sink review included the size, type of cooling supply (i.e., large body of water, ocean, lake, natural or man-made reservoir, river, pond, or cooling tower), and makeup sources to the ultimate heat sink. The review has determined the adequacy of the applicant's proposed design criteria, design bases and safety classi- fication for the ultimate heat sink and the requirements for deliver- ing cooling water for a safe shutdown during normal and accident conditions. The UHS and its supporting systems meet seismic category I, Quality Group C requirements. The staff concludes that the design of the ultimate heat sink is acceptable and meets the requirements of General Design Criteria 2, 5, 44, 45, and 46. This conclusion is based on the following:' 1. The applicant has met the requirement of General Design Criterion 2 with respect to being capable of withstanding the effects of earth- quakes. Acceptance is based on meeting the guidance of Regulatory Guide 1.29, Position C-1. 2. The applicant has met the requirements of General Design Criterion 5 with respect to sharing of structures,