COMPBRN III: A Computer Code for Modeling Compartment Fires (NUREG/CR-4566, ORNL/TM-10005)

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Publication Information

Manuscript Completed: November 1985
Date Published: July 1986

Prepared by:
Vincent Ho, Nathan Siu, George Apostolakis
Mechanical, Aerospace and Nuclear Engineering Department
University of California, Los Angeles
Los Angeles, California 90024
Under ORNL Subcontract No. 19X-22270
George F. Flanagan, ORNL Program Manager and Principal Investigator
Engineering Physics and Mathematics Division
Oak Ridge National Laboratory
P.O. Box X
Oak Ridge, Tennessee 37831
Operated by Martin Marietta Energy Systems, Inc.
for the U.S. Department of Energy
Under Contract No. DE-AC05-84OR21400

Ben Buchbinder, NRC Monitor

Prepared for:
Division of Risk Analysis and Operations
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Under Interagency Agreement DOE 40-550-75

NRC FIN B-0493

Availability Notice


The computer code COMPBRN III deterministically models the behavior of compartment fires. This code is an improvement of the original COMPBRN codes. It employs a different air entrainment model and numerical scheme to estimate properties of the ceiling hot gas layer model. Moreover, COMPBRN III incorporates a number of improvements in shape factor calculations and error checking, which distinguish it from the COMPBRN II code. This report presents the ceiling hot gas layer model employed by COMPBRN III as well as several other modifications. Information necessary to run COMPBRN III, including descriptions of required input and resulting output, are also presented. Simulation of experiments and a sample problem are included to demonstrate the usage of the code.

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