Document: NUREG-0800
Document ID: 97794ae3-595f-4668-8cfe-f438587bc747
Document Type: srp
Title: COMBUSTIBLE GAS CONTROL IN CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070620006.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.5
CFR Part: 
CFR Title: 

Content:
riteria are based on meeting the relevant requirements of the following Commission regulations: 1. 10 CFR Part 50, § 50.44, as it relates to BWR and PWR plants being designed to: accommodate hydrogen generation equivalent to a 100 percent fuel clad-coolant reaction; limit containment hydrogen concentration to no greater than 10 percent; have a capability for ensuring a mixed atmosphere during design bases and significant beyond- design-bases accidents (a significant beyond-design-basis accident is an accident comparable to a degraded core accident at an operating (as of October 16, 2003) light-water reactor in which a metal-water reaction occurs involving 100 percent of the fuel cladding surrounding the active fuel region (excluding the cladding surrounding the plenum volume)); and provide containment-wide hydrogen control (such as igniters or inerting), if necessary, for certain severe accidents. Post-accident conditions should be such that an uncontrolled hydrogen/oxygen recombination would not take place in the containment, or the plant should withstand the consequences of uncontrolled hydrogen/oxygen recombination without loss of safety function or containment structural integrity. 2. GDC 5 as it relates to providing assurance that sharing of structures, systems, and components important to safety among nuclear power units will not significantly impair their ability to perform their safety functions. 3. GDC 41 as it relates to systems being provided to control the concentration of hydrogen or oxygen that may be released into the reactor containment following postulated accidents to ensure that containment integrity is maintained; systems being designed to suitable requirements, i.e., that there be suitable redundancy in components and features, and suitable interconnections to ensure that for either a loss of onsite or a loss of offsite power the system safety function can be accomplished, assuming a single 6.2.5-5 Revision 3 - March 2007 failure; and systems