NESC0964 XOQDOQ.

1. NAME OR DESIGNATION OF PROGRAM:  XOQDOQ.

3. DESCRIPTION OF PROGRAM OR FUNCTION

XOQDOQ was designed for meteorological evaluation of continuous and anticipated intermittent releases from commercial nuclear power reactors. It calculates annual relative effluent concentrations and average relative deposition values at locations specified by the user and at various  standard radial distances and segments for downwind sectors. It also calculates these values at the specified locations for anticipated intermittent (e.g. containment or purge) releases, which occur during routine operation. The program computes an effective plume height that accounts for physical release height, aerodynamic downwash, plume rise, and terrain features. The user may optionally  select additional plume dispersion due to building wakes, plume depletion via dry deposition, and plume radioactive decay, or specify adjustments to represent non-straight line trajectories (recirculation or stagnation).

4. METHOD OF SOLUTION

XOQDOQ is based on the principle that diffusion of material released to the atmosphere can be described by a Gaussian distribution within the plume with transport described by a straight-line trajectory. The horizontal and vertical dispersion coefficients are empirically determined, largely from observations at or near ground level. The program implements the assumptions outlined in Section C of NRC Regulatory Guide 1.111. Long-term average values of relative effluent concentration are calculated by  assuming a long-term continuous release with effluent distributed evenly across a 22-1/2 degree sector.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   30 receptor locations/receptor type
   14 wind-speed classes
   10 distances of site-specific recirculation correction factors
    8 receptor types
    7 atmospheric stability categories
    5 separate release points
XOQDOQ cannot handle multiple emission sources or plume depletion via wet deposition, or evaluate the meteorological aspects of the consequences of accidental releases.

6. TYPICAL RUNNING TIME

NESC executed the sample problems in 2 CPU minutes on a DEC VAX11/785, 4 CPU minutes on an IBM4331, and 17 CP seconds on a CDC CYBER170/875.

NEA-DB ran the test case included in this package on IBM 3090 and VAX 8810 computers. CPU times required were 10.25 secs  (IBM); 17.35 secs (VAX).

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

This edition, designated as version 2.0, supersedes the original XOQDOQ release.

10. REFERENCES

- U.S. Nuclear Regulator Commission, Office of Standards
  Development, Regulatory Guide 1.111, Methods for Estimating
  Atmospheric Transport and Dispersion of Gaseous Effluents from
  Light-Water-Cooled Power Reactors, March 1976, with Errata,
  January 1977.

- 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)
- L. Eyberger :
  XOQDOQ Tape Description and Implantation Information
  NESC Note 87-109 (September 30, 1987)

11. MACHINE REQUIREMENTS

XOQDOQ requires 179 Kbytes of memory on a DEC VAX11/785, 244 Kbytes on an IBM4331, and 140,000 (octal) words on a  CDC CYBER170/875. Punch output is written to FORTRAN logical unit 9.

The execution on IBM 3083 required 420K bytes of main storage.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

VMS 4.5 (VAX11),  VM/CMS (IBM4331), NOS 2.4 (CDC CYBER170).

MVS/XA (IBM 3090); VMS V5.0-1 (VAX 8810).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The XOQDOQ source, as distributed, is set up for execution on a DEC VAX11. The auxiliary program, CONVERT, can be used to create IBM- and CDC-specific source. Subroutines DATE and TIME, written in Basic Assembler Language, are supplied for use in an IBM computer environment.

15. NAME AND ESTABLISHMENT OF AUTHORS

   XOQDOQ    J.F. Sagendorf
             National Oceanic and Atmospheric Administration
             Idaho Falls, ID

             J.T. Goll
             U.S. Minerals Management Service
             Reston, VA

             W.F. Sandusky
             Pacific Northwest Laboratory
             Richland, WA 99352

   CONVERT   L.R. Eyberger
             National Energy Software Center
             Argonne National Laboratory

File name	File description	Records
NESC0964_01.001	Information file	79
NESC0964_01.002	XOQDOQ Fortran source (VAX)	2926
NESC0964_01.003	XOQDOQ Fortran source (IBM)	2926
NESC0964_01.004	Assembler routines, DATE and TIME (IBM)	91
NESC0964_01.005	Sample input data (FT05F001)	155
NESC0964_01.006	Sample output (VAX)	2141
NESC0964_01.007	Sample output (IBM)	2896
NESC0964_01.008	Sample output (CDC)	2146
NESC0964_01.009	CONVERT Fortran source	92
NESC0964_01.010	Control information to execute CONVERT	59