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:
rosion of water and corrosion of metals;accommodate hydrogen generation equivalent to a 100% metal-water reaction of the fuel cladding, 22 b. be provided with the capability for measuring the hydrogen concentration in the containment, insuring a mixed containment atmosphere and controlling combustible gas concentrations in the containment;limit containment hydrogen concentration to no greater than 10%, and 23 c. be provided with an inerted atmosphere or an oxygen deficient condition if certain conditions cannot be met prior to effective operation of the combustible gas control system provide containment-wide hydrogen control (such as igniters or inerting) for severe accidents . Postaccident conditions should be such that an 24 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. As a result of the TMI-2 accident a reevaluation of the hydrogen that may be generated following an accident is being undertaken. Item II.B.8 of NUREG-0694 and NUREG-0718 discuss the rulemaking proceedings on degraded core accidents for the different classes of plants. 10 CFR Part 50 will be revised to include the additional requirements for hydrogen control systems and the amounts of hydrogen these control systems will have to accommodate.25 2. General Design Criterion 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. 6.2.5-5 DRAFT Rev. 3 - April 1996 3. General Design Criterion 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 assureensure that containment integrity is maintained; systems being designed to safety-grade requirements; i.e., that