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CCC-0262 VCS.

VCS, Radiation Protection Factors in Vehicles by Monte-Carlo

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1. NAME OR DESIGNATION OF PROGRAM:  VCS.
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2. COMPUTERS
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Program name Package id Status Status date
VCS CCC-0262/01 Arrived 21-NOV-2001

Machines used:

Package ID Orig. computer Test computer
CCC-0262/01 IBM 360 series
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The Vehicle Code System (VCS) facilitates the calculation of radiation protection factors for a
given vehicle; i.e. the ratio by which the free-field radiation is reduced due to the presence of the vehicle. VCS was constructed by linking together a discrete-ordinates air-transport calculation and  an adjoint Monte Carlo vehicle dose-importance calculation. A tactical nuclear weapon of low-kiloton yield is detonated within a kilometer of a vehicle. The air-transport calculation determines the neutron and photon flux as a function of energy on a coupling surface surrounding the vehicle. The dose-importance calculation determines the effectiveness of particles at the coupling surface in contributing to dose at a detector position within the vehicle.
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4. METHOD OF SOLUTION

VCS calculates protection factors for armored military vehicles by coupling a discrete ordinates calculation with  an adjoint Monte Carlo calculation. The discrete ordinates calculation determines the flux on a coupling surface surrounding the vehicle. The Monte Carlo calculation calculates the effectiveness of flux at the surface in causing response in a detector adjacent to the crew members, i.e., the "dose importance".  A coupling code folds the flux together with the dose importance, giving the dose response. The coupling code can also rotate the vehicle, move it to different distances from the source, and perturb the energy response of the detector.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  None noted.
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6. TYPICAL RUNNING TIME

The DOT section of VCS requires about 2 hours of CPU time on the IBM 195. Each new vehicle configuration or source position requires about 25 minutes. Each new range or detector response spectrum or vehicle orientation costs a fraction of a minute. RSIC did not complete the running of the packages sample problem because of long running time.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
CCC-0262/01
VISA                Coupling surface flux generator
DRC                 Detector response calculation
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9. STATUS
Package ID Status date Status
CCC-0262/01 21-NOV-2001 Masterfiled Arrived
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10. REFERENCES

- W.A. Rhoades:
  Development of a Code System for Determining Radiation Protection
  of Armored Vehicles (The VCS Code)
  ORNL-TM-4664 (October 1974)
CCC-0262/01, included references:
- W. Rhoades et al.:
  Vehicle Code System (VCS) User's Manual
  ORNL-TM-4648 (August 1974)
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11. MACHINE REQUIREMENTS:  VCS was designed for the IBM 360/370 computers.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0262/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

A FORTRAN IV compiler and IBM OS/VS Assembler are required.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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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:   Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
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16. MATERIAL AVAILABLE
CCC-0262/01
source program   mag tapeVISA Source (Fortran IV)                   SRCTP
source program   mag tapeITIME Source (Assembler)                   SRCTP
source program   mag tapeIKLOCK Source (Assembler)                  SRCTP
source program   mag tapeBSAM Source (Assembler)                    SRCTP
test-case data   mag tapeVISA Sample input data                     DATTP
test-case data   mag tapeSUBRT (Assembler)                          DATTP
test-case data   mag tapeDRC Sample input data                      DATTP
source program   mag tapeDOT-III calling program source (FORTRAN IV)SRCTP
test-case data   mag tapeDOT-III sample data for VCS problem        DATTP
source program   mag tapeMORSE routines for VCS problem (FORTRAN IV)SRCTP
test-case data   mag tapeMORSE sample data for VCS problem          DATTP
user's guide             ORNL-TM-4648 (August 1974)                 WRKPT
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17. CATEGORIES
  • J. Gamma Heating and Shield Design

Keywords: air scattering, radiation doses, radiation effects, shielding.