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:
nd operability of its components, as well as the operability of the system as a whole, under conditions as close to the design basis as practical. Meeting the requirements of GDC 46 provides assurance that components and equipment of the ultimate heat sink can and will be tested, thereby ensuring that the system will perform its intended safety function. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. Availability of an adequate supply of water for the UHS is a basic requirement for any nuclear power plant. There are various methods for satisfying the requirement (e.g., a large body of water like an ocean, lake, natural or manmade reservoir, a river, cooling ponds or towers, or such combinations). The UHS design tends to be unique for each nuclear plant, depending upon its geographical location. For purposes of this SRP section, typical procedures are established for identifying UHS essential features. For installations where these general procedures are not completely adequate, the reviewer supplements them as necessary. 1. The safety analysis report (SAR) is reviewed for the overall arrangement and type of UHS proposed. The reviewer verifies that the UHS is designed to maintain system function as required in adverse environmental phenomena including freezing and loss of offsite power. The reviewer evaluates the system for whether: A. The heat inputs in the UHS design are conservative. The reviewer makes an independent evaluation of the applicant’s calculated heat loads. The UHS heat loads include heat due to decay of radioactive material, sensible heat, pump