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:
only when the equilibrium sump solution pH, after mixing and dilution with the primary coolant and ECCS injection, is above 7. This pH value should be achieved by the onset of the spray recirculation mode. H. Storage of Additives. The design should provide facilities for the long-term storage of any spray additives. These facilities should be designed so that the additives required to achieve the design objectives of the system are stored in a state of continuous readiness whenever the reactor is critical for the design life of the plant. The storage facilities should be designed to prevent freezing, precipitation, chemical reaction, and decomposition of the additives. For sodium hydroxide storage tanks, heat tracing of tanks and piping is required whenever exposure to temperatures below 4.5 EC (40 EF) is predicted. An inert cover gas should be provided for solutions that may deteriorate when exposed to air. 6.5.2-6 Revision 4 - March 2007 I. Single Failure. The system should be able to function effectively and meet all the criteria in Subsection II with a single failure of an active component in the spray system, in any of its subsystems, or in any of its support systems. 2. Testing. Tests should be performed to demonstrate that the containment spray system, as installed, meets all design requirements for an effective fission-product-scrubbing function. Such tests should include preoperational verification of: A. freedom of the containment spray piping and nozzles from obstructions, B. the capability of the system to deliver the required spray flow, and C. the capability of the system to deliver spray additives (if any are needed) and to achieve the sump solution pH specified in the SAR. For a system such as a gravity feed system, whose performance is sensitive to the as-built piping layout, the testing should be performed at full flow. 3. Technical Specifications. The technical specifications should specify appropriate limiting conditions for operation, tests,