Document: NUREG-0800
Document ID: eb117be6-f688-40f6-97a8-c91b8e9f8e74
Document Type: srp
Title: CONTAINMENT HEAT REMOVAL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070457.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.2
CFR Part: 
CFR Title: 

Content:
calculated NPSH available to the pumps to assureensure67 that a positive margin is maintained. The CSBSCSB also reviews the pre-operational 68 test programs, and periodic inservice inspection and test programs, to verify that adequate NPSH is available to the pumps and the continuing operability of the pumps during the lifetime of the plant. 6. If in the judgment of the CSBSCSB, the NPSH analyses were not done in a sufficiently 69 conservative manner, confirmatory analyses are performed using the CONTEMPT-LT70 (Reference 8) computer code. 71 7. The CSBSCSB also reviews the evaluation of the volume of the containment covered 72 by the sprays and the extent of overlapping of the sprays with respect to heat removal capabilities. A judgment will be made regarding the acceptability of the spray coverage and extent of overlapping; the volume of the containment covered by the sprays should be maximized and the extent of overlapping kept to a minimum. Elevation and plan drawings of the containment showing the spray patterns are used to determine coverage and overlapping. 8. In general, the design requirements for the spray systems with respect to spray drop size spectrum and mean drop size, spray drop residence time in the containment atmosphere, 6.2.2-9 DRAFT Rev. 5 - April 1996 containment coverage by the sprays, and extent of overlapping of the sprays are more stringent when the acceptability of the system is being considered from an iodine removal capability standpoint rather than from a heat removal capability standpoint. Consequently, when the iodine removal capability of the system is satisfied, the heat removal capability will be found acceptable. a. The Accident Evaluation BranchEMCB is responsible for determining the 73 acceptability of the iodine removal effectiveness of the sprays (See Standard Review Plan Section 6.5.2). b. Since all plants do not use the containment sprays as a fission product removal system, the CSBSCSB reviews the system for cases where the