Document: NUREG-0800
Document ID: 936f16a2-5593-4498-8533-ddca55910376
Document Type: srp
Title: COMBUSTIBLE GAS CONTROL IN CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340704.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.5
CFR Part: 
CFR Title: 

Content:
acceptable basis for these plants, at the option of the applicants. As necessary, the CSB will make confirmatory analyses of combustible gas production and accumulation. These analyses are done using the COGAP computer code, a description of which is attached as Appendix A to this SRP section. The safety analysis report should contain the required code input data. The purposes of the analyses are: a. To confirm the predictions of hydrogen and oxygen generation appear- ing in the safety analysis report. b. To verify that the systems provided for combustible gas control are capable of maintaining the concentrations of hydrogen and oxygen below the concentration limits specified in Table 1 of Regulatory Guide 1.7. 2. The combustible gas control systems include systems for mixing the combus- tible gases, monitoring combustible gas concentrations, and reducing the combustible gas concentrations. In general, all of the combustible gas control systems should meet the design requirements for engineered safety features, as outlined in subsection II. The system description and schematic drawings presented in the safety analysis report should be suf- ficiently detailed to permit judgments to be made regarding system accept- ability. CSB determines that all potential, single active mechanical failures and passive electrical failures have been identified and that no single failure would incapacitate the entire system. Passive mechanical failures, beyond those possible from missile impact, need not be considered in view of the design and construction standards for the systems. CSB compares the quality standards applied to the systems to Regulatory Guide 1.26. CSB compares the seismic design classifications of the systems to Regula- tory Guide 1.29. 3. CSB reviews the qualification testing of systems and components, to estab- lish the functional capability of the equipment. 4. CSB reviews the provisions made in the design of the systems and the pro- gram for periodic inservice