Document: NUREG-0800
Document ID: ebff6c02-bdd3-4751-9e36-9347caf05c8e
Document Type: srp
Title: and 2.4.6 are applicable to low water estimates due to the various phenomena discussed.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070258.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.5
CFR Part: 
CFR Title: 

Content:
e-related accident phenomena, and DRAFT Rev. 3 - April 1996 2.4.11-8 3. 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 repeated, to assureensure that the failure of one 33 component will not cause failure of the entire system. These analyses are coordinated with the ASB and PSBSPLB review of the ultimate heat sink and related cooling systems, to avoid 34 duplication. Operating rules for each portion of the system are ascertained to determine the amount of water that can be assumed available in the event of normal operations, anticipated operational occurrences, or accidental shutdownemergency shutdown and cooldown. If there 35 36 is evidence of potential structural or mechanical effects, the Structural Engineering Branch 37 (SEB) or Mechanical Engineering Branch (MEB)EMEB will be requested by HGEBECGB 38 39 40 to ascertain whether the effects are properly considered in the structural or mechanical design 41 bases for the plant. If there is evidence of potential structural effects, ECGB will ascertain whether the effects are properly considered in the structural design bases for the plant. 42 Consultations with the Geosciences Branch (GB), Accident Evaluation Branch (AEB) Emergency Preparedness and Radiation Protection BranchPERB , SEB, ASB, and PSBSPLB 43 44 are undertaken where design criteria are not firmly established. The potential for surges in intake sumps (i.e., seiching in intake structures and surges in intake pipes) that could cause adverse effects are reviewed to assureensure that the effects have been 45 properly incorporated for the intake design. The potential for adverse hydrodynamic effects of a trip of the intake pumps is evaluated based on potential surges in intake sumps. For multiple purpose (normal operations, anticipated operational occurrences, normal 46 shutdown, and emergency