PSR-0343 COMIDA.

1. NAME OR DESIGNATION OF PROGRAM:  COMIDA.

3. DESCRIPTION OF PROGRAM OR FUNCTION

COMIDA estimates radionuclide concentrations in agricultural food products following an acute fallout event. This dynamic food chain model will be implemented in  the new DOE version of the MELCOR Accident Consequence Code System (MACCS2).

4. METHOD OF SOLUTION

COMIDA uses a fourth order Runge-Kutta solver (Press et al., 1986) with adoptive stepsize control to estimate yearly harvest concentrations for five human crop types (Bq kg-1 crop per Bq m-2 deposited) and integrated concentrations for four animal products (Bq d kg-1 animal product per Bq m-2) for a unit deposition that occurs on any user-specified day of the year. COMIDA is structurally very similar to the PATHWAY model developed by Whicker and Kirchner (1987) and includes the same seasonal transport processes and discrete events for soil and vegetation compartments.  Animal product assimilation is modeled using simpler equilibrium models. Differential transport and ingrowth of up to three radioactive progeny (the sample input problems include progeny for 93Mo and 93Nb) are also evaluated,

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Implementations on other platforms requires modification of the source to reference a
comparable TIMER subroutine library function call.

6. TYPICAL RUNNING TIME

The approximate run time for each of the four included sample problems was 24 seconds on a Northgate 486/66.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- M.L. Abbott et al.:
  A Radionuclide Food Chain Model for Acute Fallout Deposition
  Idaho National Engineering Laboratory, EG&G Idaho Inc.
  EGG-GEO-10367
  ITER/US/93/TE/SA-Z (November 1993)

11. MACHINE REQUIREMENTS

An IBM PC or compatible with a floppy diskette drive and 512K of RAM is required to run the included executable. COMIDA can be installed on DEC VAX, IBM RISC, and CRAY.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

A Fortran 77 compiler is required for implementations on other platforms. The Lahey F77L3/EM32 compiler was used to create the executables included in package.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Idaho National Engineering Laboratory
                EG&G Idaho Inc.,
                Idaho Falls, Idaho, USA

miscellaneous    mag tapeREADME.RSI Information file                MISTP
source program   mag tapeCOMIDA.FOR Fortran Source                  SRCTP
source program   mag tapeCOM_RSIC.FOR modified COMIDA FTN source    SRCTP
load module      mag tapeCOMIDA.EXE DOS executable                  LODTP
miscellaneous    mag tapeCOMIDA.DMP Screen dump fm using SUMMER.PAR MISTP
test-case data   mag tapeCOMIDA.VAR Nuclide specific data           DATTP
test-case data   mag tapeFALL.PAR Fall accident sample problem      DATTP
test-case data   mag tapeWINTER.PAR Winter accident sample problem  DATTP
test-case data   mag tapeSPRING.PAR Spring accident sample problem  DATTP
test-case data   mag tapeSUMMER.PAR Summer accident sample problem  DATTP
test-case data   mag tapeCOMIDA.OUT required file unit name         OUTTP
test-case output mag tapeFALL.OUT Fall accident sample output       OUTTP
test-case output mag tapeWINTER.OUT Winter accident sample output   OUTTP
test-case output mag tapeSPRING.OUT Spring accident sample output   OUTTP
test-case output mag tapeSUMMER.OUT Summer accident sample output   OUTTP
report                   ITER/US/93/TE/SA-Z (November 1993)         REPPT