Document: NUREG-0800
Document ID: be033a97-be2a-4a23-91fe-52b123162b3b
Document Type: srp
Title: LOW WATER CONSIDERATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730439.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.11
CFR Part: 
CFR Title: 

Content:
e-related accident design criteria for each should be identified. First, a systems analysis is undertaken of all water supply sources to determine the likelihood that at least one source would survive the following: 2.4.11-10 Revision 3 - March 2007 A. the most severe of each of the natural phenomena, B. site-related accident phenomena, or C. reasonable combinations of less severe natural and accident phenomena. Second, arbitrarily assumed mechanistic failures of water supply structures and conveyance systems are postulated and the systems analysis is repeated to ensure that the failure of one component will not cause failure of the entire system. To avoid duplication, these analyses should be coordinated with the review of the ultimate heat sink and related cooling systems carried out by the organization responsible for the review of cooling water systems associated with the balance of the plant. Operating rules for each portion of the system are ascertained to determine the amount of water that can be assumed to be available in the event of normal operations, anticipated operational occurrences, or emergency shutdown and cooldown. If there is evidence of potential mechanical effects, the organization responsible for review of the SSC should be asked by the staff to ascertain whether the effects are properly considered in the mechanical design bases for the plant. If there is evidence of potential structural effects, the organization responsible for review of the SSC should ascertain whether the effects are properly considered in the structural design bases for the plant. Consultations with the organization responsible for review of the SSC should be undertaken where design criteria are not firmly established. If the possibility exists that low water could affect forces on the safety-related structures, this should be coordinated with the organization responsible for review of the structural design bases. For multiple purpose (normal operations, anticipated