ESTS1169 ARCON96.

1. NAME OR DESIGNATION OF PROGRAM:  ARCON96

3. DESCRIPTION OF PROGRAM OR FUNCTION

  ARCON96 was developed to
calculate relative concentrations in plumes from nuclear power plants
at control room air intakes in the vicinity of the release point.

4. METHODS

ARCON96 implements a straight-line Gaussian dispersion model with dispersion coefficients that are modified to account for low wind meander and building wake effects. Hourly, normalized concentrations (X/Q) are calculated from hourly meteorological data. The hourly values are averaged to form X/Qs for periods ranging from 2 to 720 hours in duration. The calculated values for each period are used to form cumulative frequency distributions.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

ARCON96 is a single
user program. If expanded output is selected by the user, the file
includes the hourly input and X/Qs and the intermediate computational results. The output file may exceed a megabyte size.

6. TYPICAL RUNNING TIME

ARCON96 calculates normalized concentrations
using hourly meteorological data. Program process is displayed during calculations. With 100+ MHz computers, 5 years of hourly data can be processed in about 1 minute.

7. UNUSUAL FEATURES

ARCON96 calculates atmospheric dispersion of material released in the vicinity of buildings at nearby receptors using hourly meteorological data. Normalized concentrations (X/Q) are calculated for periods ranging from 1 to 720 hours in duration. The results are presented in a cumulative frequency distribution for each averaging period. Normalized concentrations exceeding no more than 5% of the time are calculated from these distributions.

8. RELATED OR AUXILIARY PROGRAMS

ARCON96 is an update of ARCON95. The distribution package includes a user-interface, the computational code, and a support program that allows the computational code to address memory not normally available to dose programs.

- J.V. Ramsdell Jr. and C.A. Simonen:
   Atmospheric Relative Concentrations in Building Wakes.
  NUREG/CR-6331 Rev. 1 (PNNL-10521 Rev. 1) (May 1997)

11. HARDWARE REQUIREMENTS

  ARCON96 is designed for computers using an
80386 or higher processor, 640 kilobytes of memory with 470 kilobytes of free at run time, and a VGA color monitor. A math coprocessor is required. The user interface is designed to run in the 50-line mode.

13. SOFTWARE REQUIREMENTS

MSDOS 5.1 or higher programs will run in DOS window in Windows3.1 and Windows95.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Meteorological data are input using hourly data files. The format for the data files is described in the users guide. Input is limited to 10 data files.

15. NAME AND ESTABLISHMENT OF AUTHORS

       J.V. Ramsdell and C.A. Simonen
       Pacific Northwest National Lab.
       Richland, WA, U. S. A.

PKUNZIP.EXE Self-extracting archive file
ARCHELP.TXT ASCII text file containing  help information used by ARCONVB
ARCON96.BAT Batch file that sets screen attributes & initiates code execution
ARCONVB.EXE Visual Basic for DOS program used for data input
ARCONVB2.EXE Visual Basic for DOS program that returns control to ARCONVB2
ARCON96F.EXE FORTRAN program that performs calculations
DOSXMSF.EXE Enables ARCON96F to access to extended memory
EX? ARCON96 example files (36 files)
ARCON96.FOR Main program, providing general framework for code
CURVEFIX.FOR Calculates low-windspeed corrections to diffusion coefficient in
PAVAN
INIT.FOR Calculates several  model parameters
INVMOL2.FOR Converts stability class to the reciprocal of the Monin-Obuknov
length
MET.INC Include file containing meteorological and assorted data
METREAD.FOR Reads meteorol. data file and places input data in meteor. data
vectors
NSIGMA1.FOR Calculates initial diffusion coefficients
PARAM.INC  Include files related to code operations
PROC.FOR Processes hourly x/Q data
RECORD.FOR Writes information read from run specification file
SCENARIO.INC Contains information on the release point/receptor geometry
SCENREAD.FOR Reads run specification file identified in command line
SHIFT.FOR Called when processing of available data is complete & more data is
avail
SUMMARY.FOR Primary output routine for ARCON96
UNITS.INC Files related to code operations
WAKECORR.FOR Calculates building-wake corrections to diffusion coefficients
WINDYXOQ.FOR Calculates hourly centerline and sector-average x/Qs
XOQ.INC Contains info. on x/Qs
XOQ95.FOR Caculates the 95th percentile x/Q for each averaging period
XOQCALC5.FOR Processes hourly meteorological data