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:
REVIEW RESPONSIBILITIES Primary - Containment Systems Branch (CSB) Secondary - None I. AREAS OF REVIEW CSB reviews the information presented in the applicant's safety analysis report (SAR) concerning the control of combustible gases in the containment following a loss-of-coolant accident to assure conformance with the requirements of General Design Criteria 41, 42 and 43. Following a loss-of-coolant accident, hydrogen and oxygen may accumulate inside the containment. The major sources of hydrogen and oxygen are: a chemical reaction between the fuel rod cladding and steam, the cor- rosion of aluminium and other materials by an alkaline spray solution, and the radiolytic decomposition of the water in the reactor core and, the containment sump. If excessive hydrogen is generated it may combine with oxygen in the containment atmosphere. For inerted containments, the potential exists for hydrogen to combine with oxygen generated following the accident. The CSB review includes the following general areas: 1. The production and accumulation of combustible gases within the containment following a postulated loss-of-coolant accident. 2. The capability to mix the combustible gases with the containment atmosphere and prevent high concentrations of combustible gases in local areas. 3. The capability to monitor combustible gas concentrations within containment. 4. The capability to reduce combustible gas concentrations within containment by suitable means, such as recombination, dilution, or purging. Rev. 2 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents ate made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and policies. Standard review plans are not substitutes for regulatory guides or the