Document: NUREG-0800
Document ID: 9e3f4564-4ddf-4369-b699-a42709a80b66
Document Type: srp
Title: CONTAINMENT SPRAY AS A FISSION PRODUCT CLEANUP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070190178.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.2
CFR Part: 
CFR Title: 

Content:
criteria of Subsection II are met. Automatic initiation of spray is reviewed under SRP Section 6.2.2. The system should operate continuously until the fission product removal objectives of the system are met. The reviewer should confirm that all requirements listed in the acceptance criteria, particularly the requirements for spray coverage and sump solution pH, are met during the recirculation phase. Switchover from the injection mode to the recirculation mode following initiation to the spray system operation must be automatic to prevent damage to the spray pumps through loss of suction. 6.5.2-9 Revision 4 - March 2007 C. Spray Distribution and Containment Mixing (secondary reviewer). The number and layout of the spray headers used to distribute the spray flow in the containment space are reviewed. The reviewer verifies that the layout of the headers ensures that the spray covers essentially the entire horizontal cross section of the containment building under minimum spray flow conditions. The effect of the postaccident high-temperature and pressure conditions in the containment atmosphere on the spray droplet trajectories should be accounted for in determining the area covered by the spray. The layout of the containment building is reviewed to determine if any areas of the containment free space are not sprayed. The mixing rate attributed to natural convection between the sprayed and unsprayed regions of the containment building is assumed to be two turnovers of the unsprayed region(s) per hour, provided that adequate flow exists between these regions. The applicant would have to justify other rates. The containment building atmosphere may be considered a single well-mixed space if the spray covers at least 90 percent of the containment building space and if a ventilation system is available for adequate mixing of any unsprayed compartments. D. Spray Nozzles (secondary reviewer). The design of the spray nozzles is reviewed to confirm that the spray nozzles are