NESC9800 PFPL.

1. NAME OR DESIGNATION OF PROGRAM:  PFPL.

3. DESCRIPTION OF PROGRAM OR FUNCTION

PFPL is an interactive transport and diffusion program developed for real-time calculation  of the location and concentration of toxic or radioactive materials  during an accidental release. Deposition calculations are included.   The potential exists at the Savannah River Plant for releases of either toxic gases or radionuclides. The automated system developed  to provide real-time information on the trajectory and concentration of an accidental release consists of meteorological towers, a minicomputer, and a network of terminals called the Weather Information and Display (WIND) System. PFPL which simulates either instantaneous (puff) or continuous (plume) releases is the primary code used at Savannah River for emergency response. In the PFPL model the diffusion process is separated into two phases. In phase I, the Gaussian cloud grows as a function of wind speed and stability class. Near the ground, the vertical concentration becomes logarithmic. Phase II begins when the vertical standard deviation reaches a value of 0.8H, where H is the depth of the atmosphere's turbulent layer. At the horizontal distance from the source where the standard deviation = 0.8H, the material remaining in the cloud is redistributed to a uniform vertical concentration throughout the  mixed-layer. The logarithmic surface layer remains. The basic theory of the model assumes that the dry deposition rate is limited by surface deposition processes and by the rate at which turbulence can bring pollutants down to the surface (deposition) layer. The net effect of the two transfer rates determines the cloud depletion rate and surface concentrations. Depletion of the cloud by rain and radioactive decay is treated as an independent process.

4. METHOD OF SOLUTION

The fundamental equation solved is the general  advection-diffusion equation, including gravitational settling, rainout, and radioactive decay.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

To compile and link the source program on a VAX-11/780  computer 3 minutes, 21 seconds of CPU time were required.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- AJ. Garrett and C.E. Murphy Jr.:
  A PUFF-PLUME Atmospheric Deposition Model for Use at SRP in
  Emergency Response Situations.
  DP-1595  (May 1981)

11. MACHINE REQUIREMENTS:

Peak working set size: 1000; peak page file size: 1869.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
VMS-4.3 (VAX-11/780)

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Much of the software is specific to the Savannah River Plant environment. VAX/VMS system services, and FORTRAN extensions are used extensively. Data files are provided for demonstration. The software for archiving the required on-line meteorological data is not included. Subroutines used for graphic display of results and operational control of the DEC VT100 and Tektronix terminals in the  terminal network are included. Anyone wishing to use these routines  must make appropriate modifications to the file TERMINALS.DAT. Graphic output on a Tektronix terminal requires the proprietary Tektronix PLOT10 Interactive Graphics Library. The DAT files provided were copied during the afternoon of December 28, 1983. Test runs attempting to use these files should specify release times on or before that date. Any user wishing to obtain numerical output only from the model based on conditions in his locality must supply  appropriate wind data for the program.

15. NAME AND ESTABLISHMENT OF AUTHORS

         M.M. Pendergast, A.J. Garrett and C.E. Murphy, Jr.
         Savannah River Laboratory
         Aiken, South Carolina 29801
Contact  D.D. Hoel

File name	File description	Records
NESC9800_01.001	This information file	106
NESC9800_01.002	PFPL source program FORTRAN 77	8083
NESC9800_01.003	JCL file	6
NESC9800_01.004	Sample run text at NEADB	144
NESC9800_01.005	TERMINALS file at NEADB	2
NESC9800_01.006	ARCIX1.DAT	673
NESC9800_01.007	ARCIX2.DAT	673
NESC9800_01.008	ARCIX3.DAT	673
NESC9800_01.009	CANNED.DAT	135
NESC9800_01.010	DVIDEF.MAR	2
NESC9800_01.011	F5MAP1.DAT	127
NESC9800_01.012	F5MAP2.DAT	93
NESC9800_01.013	F5MAP3.DAT	306
NESC9800_01.014	HRAIX1.DAT	169
NESC9800_01.015	HRAIX2.DAT	169
NESC9800_01.016	HRAIX3.DAT	169
NESC9800_01.017	IDLOCAL.DAT	33
NESC9800_01.018	IDNAME.DAT	96
NESC9800_01.019	ISOCHAIN.DAT	34
NESC9800_01.020	LATLON.DAT	99
NESC9800_01.021	MOSOUT.DAT	2
NESC9800_01.022	SAMPLE.TXT sample problem run	145
NESC9800_01.023	SRPBND.DAT	1608
NESC9800_01.024	SRPRDS.DAT	5367
NESC9800_01.025	STATES.DAT	5367
NESC9800_01.026	TERMINALS.DAT	37
NESC9800_01.027	TVSVDT.DAT	9