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ESTS0331 MESORAD1.4.

MESORAD, Emergency Response Airborne Dose Assessment

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1. NAME OR DESIGNATION OF PROGRAM:  MESORAD1.4, emergency response dose assesment.
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2. COMPUTERS
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Program name Package id Status Status date
MESORAD1.4 ESTS0331/01 Tested 22-MAR-1995

Machines used:

Package ID Orig. computer Test computer
ESTS0331/01 DEC VAX 11/780 DEC VAX 6000
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3. DESCRIPTION OF PROGRAM OR FUNCTION

MESORAD1.4 is a dose assessment model for emergency response applications. Dose pathways represented in the model are those that are most likely to be important during and immediately following a release (hours) rather than over an extended time frame (days or weeks). The doses computed include: external dose resulting from exposure to radiation emitted by radionuclides in the air and deposited on the ground, internal dose  commitments resulting from inhalation, and total whole-body dose. Three preprocessors are included with MESORAD. RSFPREP generates the MESORAD run specification (input) file, METWR creates the meteorological data file, and RELPREP prepares the release definition file. PRNT is a postprocessor for generating printer or screen-compatible output. All four programs run interactively.
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4. METHOD OF SOLUTION

External doses from airborne material are computed using semi-infinite and finite cloud approximations. When the dimensions of the puff become large in comparison with the mean  free paths of gamma radiation emitted from radionuclides in the puff, the semi-infinite cloud model is used. Otherwise, the finite puff model is applied. The finite puff model is an approximation to  the point-kernel integration technique which reduces dose computation times. Atmospheric processes are represented by a combination of Lagrangian puff and Gaussian plume dispersion models, a source depletion (deposition velocity) dry deposition model, and a wet deposition model using washout coefficients based on precipitation rates. Dose assessment calculations occur simultaneously with the atmospheric dispersion and deposition calculations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

MESORAD is designed  to accommodate up to 50 radionuclides.
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6. TYPICAL RUNNING TIME

Model execution proceeds at a nominal rate of approximately 1 minute per hour simulated for a continuous release.  The two sample problems require about 8 or 9 CPU seconds, respectively, on a DEC VAX6220.
ESTS0331/01
The sample problems were executed at the NEA Data Bank  on a DEC VAX 6000/510 computer in about 2.3 and 3.5 seconds, respectively.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

MESORAD was developed from version  2.0 of the MESOI atmospheric dispersion model (NESC 9862) retaining  its modular nature.
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9. STATUS
Package ID Status date Status
ESTS0331/01 22-MAR-1995 Tested at NEADB
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10. REFERENCES

- J.V. Ramsdell, G.F. Athey, and C.S. Glantz, MESOI Version 2.0: An
  Interactive Mesoscale Lagrangian Puff Dispersion Model with
  Deposition and Decay, NUREG/CR-3344 (PNL-4753), November 1983.
ESTS0331/01, included references:
- R.I. Scherpelz et al.:
  The MESORAD Dose Assessment Model
  Volume 1: Technical Basis
  NUREG/CR-4000, PNL-5219 RH (January 1986).
- J.V. Ramsdell et al.:
  The MESORAD Dose Assessment Model
  Volume 2: Computer Code
  NUREG/CR-4000, PNL-5219 (September 1988).
- M. Birgersson:
  MESORAD1.4 Tape Description and Implementation Information
  NESC Note 92-01 (October 2, 1991).
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11. MACHINE REQUIREMENTS:  1.1 Mbytes on a DEC VAX6220.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0331/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VMS.
ESTS0331/01
The program MESORAD was executed at the NEA Data Bank on a VAX 6000/510 computer running Open VMS V6.1.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

File
MROUT.FMT, which describes the MESORAD output format, was created using a text editor and is read by subroutine OUT2 in PRNT. Volume 3 of the reference report, which was intended to describe the auxiliary programs, was never written.
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15. NAME AND ESTABLISHMENT OF AUTHORS: J.V. Ramsdell
Pacific Northwest Laboratory
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16. MATERIAL AVAILABLE
ESTS0331/01
File name File description Records
ESTS0331_01.001 MESORAD Information File 401
ESTS0331_01.002 MESORAD FORTRAN source file 7302
ESTS0331_01.003 Program to prepare a Run Specification File 608
ESTS0331_01.004 Program to prepare a Release File 108
ESTS0331_01.005 Program to prepare a Meteorolog. Data File 52
ESTS0331_01.006 Program to generate printer data file 711
ESTS0331_01.007 Include File CHECK 31
ESTS0331_01.008 Include File CIGMAT 22
ESTS0331_01.009 Include File CIGTER 22
ESTS0331_01.010 Include File CYL 27
ESTS0331_01.011 Include File DATIM 27
ESTS0331_01.012 Include File DIFTER 23
ESTS0331_01.013 Include File DOSE 57
ESTS0331_01.014 Include File FPUFF 20
ESTS0331_01.015 Include File GENERL 40
ESTS0331_01.016 Include File MATRIX 26
ESTS0331_01.017 Include File METEOR 40
ESTS0331_01.018 Include File NUC 45
ESTS0331_01.019 Include File PARAM 24
ESTS0331_01.020 Include File PRT 27
ESTS0331_01.021 Include File PUFFS 30
ESTS0331_01.022 Include File REL 26
ESTS0331_01.023 Include File TOPOGR 24
ESTS0331_01.024 Include File UNITS 29
ESTS0331_01.025 Include File WFMOD 20
ESTS0331_01.026 MESORAD executable file 0
ESTS0331_01.027 Sample input file - problem 1 29
ESTS0331_01.028 Sample input file - problem 2 22
ESTS0331_01.029 Meteorological data file 1 (to run prob. 1) 0
ESTS0331_01.030 Meteorological data file 3 (to run prob. 2) 0
ESTS0331_01.031 Release Data File 3
ESTS0331_01.032 Radionuclide Data File 214
ESTS0331_01.033 Sample output file (problem 2) 604
ESTS0331_01.034 Sample output file (problem 2) 924
ESTS0331_01.035 PRNT output on file AIRNDP_MAR16_1030.CUM 295
ESTS0331_01.036 PRNT output on file AIRNDP_MAR16_1030.CUM 61
ESTS0331_01.037 MESORAD output description 60
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: atmospheric precipitations, deposition, dispersions, meteorology, nuclear power plants, radiation doses, radionuclide migration.