Document: NUREG-0800
Document ID: 848ab24d-ac9b-4ec5-85ff-099e13b769c3
Document Type: srp
Title: CONTAINMENT SPRAY AS A FISSION PRODUCT CLEANUP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0601/ML060150001.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.2
CFR Part: 
CFR Title: 

Content:
available for adequate mixing of any unsprayed compartments. 6.5.2-9 Rev. 3 - December 2005 d. Spray Nozzles (secondary reviewer) The design of the spray nozzles is reviewed to confirm that the spray nozzles are not subject to clogging from debris entering the recirculation system through the containment sump screens. e. Containment Sump Mixing (primary reviewer) The mixing of the spray water containing any chemical additive and water without additive (such as spilling ECCS coolant) in the containment sump is reviewed. The reviewer considers areas of the containment building that are exposed to the spray but are without direct drains to the recirculation sump (such as the refueling cavity). The reviewer confirms that the required sump solution concentrations are achieved within the appropriate time intervals. The pH of the sump solution should be reviewed in regard to iodine reevolution, using the criteria given in Subsection II.1.g and the procedure in Subsection III.4.c.(2). f. Storage of Additives (primary reviewer) The design of any additive storage tank is reviewed to establish whether heat tracing is required to prevent freezing or precipitation in the tank. The reviewer determines whether an inert cover gas is provided for the tank to prevent reactions of the additive with air such as the formation of sodium carbonate by the reaction of sodium hydroxide and carbon dioxide. Alternatively, the reviewer verifies by a conservative analysis that an inert cover gas is not required. g. Single Failure (primary reviewer/secondary reviewer) The system schematics are reviewed by inspection, postulating single failures of any active component in the system, including inadvertent operation of valves that are not locked open. The review is performed with respect to the fission product removal function, considering conditions that could result in fast as well as slow injection of the spray solution. 2. Testing (secondary reviewer) At the construction permit stage, the