Document: NUREG-0800
Document ID: 6fd4d885-bb73-4ac0-9513-7365558c831e
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550053.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
nonsafety-related portions. 2. The applicant meets GDC 4 requirements for the effects of missiles inside and outside of containment, effects of pipe whip and jets, and environmental conditions caused by high- and moderate-energy line breaks and dynamic effects of flow instabilities and attendant loads (i.e., water hammer) as to impairment of the required functions of auxiliary cooling systems during normal plant operations and under upset or accident conditions. Acceptance as to effects of water hammer is based on the following: A. Vents for venting components and piping at high points in liquid-filled systems, which are normally idle and in which voids could occur, are provided. These vents should be located for ease of operation and periodic testing. B. If in the system design voiding could occur after pump shutdown or during standby, there should be means for a slow system fill upon pump start to avoid water hammer, or the system should be designed to maintain function following an inadvertent water hammer occurrence. C. The applicant shall review operation and maintenance procedures for adequate measures to avoid water hammer due to voided line conditions. 3. The applicant meets GDC 5 requirements for SSC sharing by demonstrating that such sharing does not significantly impair the ability of the reactor auxiliary CWS to perform safety functions, including, in an accident in one unit, an orderly shutdown and cooldown of the remaining unit(s). 4. The applicant meets GDC 44 requirements for cooling water by a system to transfer heat from SSCs important to safety to an ultimate heat sink. The applicant has demonstrated that the reactor auxiliary CWS can transfer the combined heat load of these SSCs under normal operating and accident conditions, assuming loss of offsite power and a single failure, and that portions of the system can be isolated so system safety functions are not compromised. Also in meeting GDC 44 requirements the applicant has demonstrated that: