Document: NUREG-0800
Document ID: 5cdeed4a-6cd5-4840-90c0-5159fbf2c9f0
Document Type: srp
Title: CHILLED WATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1409/ML14093A350.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.7
CFR Part: 
CFR Title: 

Content:
ould 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. D. VWS preoperational testing may be necessary to verify that during various system alignments or train transfers/shutdowns there is no evidence of water hammer occurrence. 9.2.7-29 Draft Revision 0 – July 2014 Note: RTNSS B SSCs are analyzed and designed to withstand adverse effects associated with internal hazards, i.e., those created from conditions inside the plant (e.g., turbine missiles, pipe whipping, and flooding). 4. The applicant meets GDC 5 requirements for SSC sharing by demonstrating that such sharing does not significantly impair the ability of the VWS to perform safety functions, including, in an accident in one unit, an orderly shutdown and cool down of the remaining unit(s). 5. 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 VWS can transfer the combined heat load of these SSCs under normal operating and accident conditions, assuming LOOP and a single failure, and that portions of the system can be isolated so system safety functions are not compromised. The design has been evaluated for adequate margins related to heat exchanger heat removal performance during normal and accident conditions; VWS pump pressure (head) and system flow rates during normal and accident conditions. Also in meeting GDC 44 requirements the applicant has demonstrated that VWS pumps are adequately designed related to net positive suction head required (NPSHr) and are evaluated against NPSH available (NPSHa) under normal and accident conditions. Potential VWS pump