1. NAME AND TITLE

XOQDOQ-82: Radiological Assessment Code System Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations.

The newly frozen version packaged by RSIC in September 1983 reflects considerable new development beyond the October 1981 version, including improved documentation. A Data General version (B) was added in April 1985. An IBM PC/AT version was added in July 1989.

2. CONTRIBUTORS

U.S. Nuclear Regulatory Commission, Washington, D. C.

Pacific Northwest Laboratories, Richland, Washington.

Morton and Potter, Potomac, Maryland.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV (A), FORTRAN 77 (B and C); IBM 3033 (A), DG MV/8000 (B), IBM PC/AT and PC/XT (C).

4. NATURE OF PROBLEM SOLVED

XOQDOQ-82 evaluates the transport, dispersion, and deposition of effluents released to the atmosphere. Since the program uses meteorological data averaged over long periods of time, it is appropriate for use in environmental impact studies rather than in the analyses of accidental releases.

5. METHOD OF SOLUTION

Using a ``straight-line'' airflow model in the Gaussian atmospheric diffusion equations, XOQDOQ-82 implements the assumptions outlined in Reference 2. For routine plant releases, it calculates average relative effluent concentrations (X/Q) and average relative deposition values (D/Q) at locations specified by the user, and at standard radial distances and segments for downwind sectors. It also calculates these values at the specified locations for intermittent releases. The options are:

(1) The release point of the effluent plume can be assumed to be always elevated, always ground-level, or a mixed mode;

(2) elevated releases can have plume rise due to buoyancy and/or momentum;

(3) ground-level releases can be affected building or terrain wakes;

(4) measured wind speeds may be extrapolated to other elevations;

(5) topography may be varied;

(6) the plume may undergo radioactive decay and dry deposition;

(7) the X/Q and D/Q values may be amended to reflect the effects of local air recirculation or stagnation;

(8) the X/Q and D/Q values can be punched for predetermined distance segments and for specific points of interest;

(9) the joint frequency data may be input as percent or total frequency of occurrence, and;

(10) Plume growth parameters can be described by Pasquill-Gifford curves or Markee desert curves.

A 16-compass-point rose is used to input frequency of wind direction as a function of atmospheric stability and maximum wind speed.

6. RESTRICTIONS OR LIMITATIONS

The program requires site-specific meteorological and terrain information. The results are somewhat conservative because of the assumed persistence of stable conditions. The major shortcoming of this program is that the wind speed, wind direction, and meteorological stability cannot be varied with time.

Limits for receptor locations as well as other problem-specific input are given in the input description.

7. TYPICAL RUNNING TIME

The first sample problem compiled and executed in less than 17 cpu seconds. Most of the source files compile within a minute or two; however, SUBS.FOR required 15 minutes. The link step required 3 minutes on an IBM PC/XT. Execution of the sample problem took about 25 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

The code was developed on the CDC 7600. The IBM version requires approximately 236 K words of virtual memory to execute sample problem 1 on the IBM 3033 (A).

The code was also modified to run on a Data General MV/8000 (B) and an IBM PC/AT (C). The PC version requires a math co-processor.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required for the IBM 360/370 or a FORTRAN 77 compiler for the MV/8000. No special requirements or restrictions are made on the operating system. The PC version was developed for use with the Ryan McFarland compiler, version 2.0 or higher.

10. REFERENCES

J. F. Sagendorf, J. T. Goll, and W. F. Sandusky, "XOQDOQ Computer Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations," NUREG/CR-2919 (PNL-4380) (September 1982).

"Methods for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors," U.S. Nuclear Regulatory Guide 1.111, Rev. 1 (July 1977).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source codes and sample problem input and output. The PC version is available on one double-sided, double-density (360 K) diskette.

12. DATE OF ABSTRACT

December 1981; revised September 1983; April 1985, July 1989.