Computer Codes for Evaluation of Control Room Habitability (HABIT) (NUREG/CR-6210, PNL-10496)

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Publication Information

Manuscript Completed: October 1995
Date Published: June 1996

Prepared by:
S. A. Stage

Pacific Northwest Laboratory
Richland, WA 99352

J. Schaperow, NRC Project Manager

Prepared for:
Division of Systems Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code L2560

Availability Notice


This report describes The Computer Codes for Evaluation of Control Room Habitability (HABIT). HABIT is a package of computer codes designed to be used for the evaluation of control room habitability in the event of an accidental release of toxic chemicals or radioactive materials. Given information about the design of a nuclear power plant, a scenario for the release of toxic chemicals or radionuclides, and information about the air flows and protection systems of the control room, HABIT can be used to estimate the chemical exposure or radiological dose to control room personnel.

HABIT is an integrated package of several programs that previously needed to be run separately and required considerable user intervention. These are EXTRAN, CHEM, TACT5, FPFP_2, and CONHAB. New input routines have been written for these routines using data input windows. These are designed for easy use when entering, reviewing, and revising the data. The programs can now be run in sequence as an integrated package. Improvements have been made in the computational methods used by some of the. routines. The programs produce files containing ASCII tables of values and output files that can readily be imported into a commercial spreadsheet to be graphed or for further computations.

This report discusses the theoretical basis and physical assumptions made by each of the modules in HABIT and gives detailed information about the data entry windows. Sample runs are given for each of the modules. A brief section of programming notes is included.

A set of computer disks will accompany this report if the report is ordered from the Energy Science and Technology Software Center. The disks contain the files needed to run HABIT on a personal computer running DOS. Source codes for the various HABIT routines are on the disks. Also included are input and output files for three demonstration runs.

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