Document: NUREG-0800
Document ID: 545a669a-51a1-4b1f-9d90-78ee08ca0845
Document Type: srp
Title: COMBUSTIBLE GAS CONTROL IN CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070463.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.5
CFR Part: 
CFR Title: 

Content:
y an equivalent of a 100% fuel-clad metal water reaction following postulated accidents and that containment hydrogen concentration be limited to 10% of the fission 26 product decay energy used in the calculation of hydrogen and oxygen production from radiolysis of the emergency core cooling water and sump water. Hydrogen concentration is acceptable if it is equal to or more conservative than the decay energy model given in Branch Technical Position ASBSPLB 9-2 in SRP Section 9.2.5. 3. In meeting the requirements of 10 CFR Part 50, §§ 50.34, 50.44 and 50.46 to provide the capability for insuring a mixed atmosphere in the containment, and of GDC 41 to provide systems as necessary to assureensure that containment integrity is maintained, a system should be provided to mix the combustible gases within the containment. The functional design of this system will depend on the type of containment. This system may consist of a fan, a fan cooler, or containment spray. An analysis should be presented which shows that excessive stratification of combustible gases will not occur within the containment or within a containment subcompartment. For containments which rely on convective mixing in conjunction with system operation to mix the combustible gases, the containment internal structures must have design features which promote the free DRAFT Rev. 3 - April 1996 6.2.5-6 circulation of the atmosphere. An analysis of the effectiveness of these features for convective mixing should be presented. This analysis is acceptable if it can be shown that combustible gases will not accumulate within a compartment or cubicle to form an combustible mixture. 4. In meeting the requirements of 10 CFR Part 50, §§ 50.34, 50.44 and 50.46 and GDC 41 regarding the functional capability of the combustible gas control systems to assureensure that containment integrity is maintained, the systems provided to reduce the concentration of hydrogen or oxygen in the containment will be accepted, from a