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USCD1239 VENTEASY.

VENTEASY, Criticality Search for a Desired Keffective by Adjusting Dimensions, Nuclide Concentrations, or Buckling

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1. NAME OR DESIGNATION OF PROGRAM:  VENTEASY
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2. COMPUTERS
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Program name Package id Status Status date
VENTEASY USCD1239/02 Tested 13-OCT-2011

Machines used:

Package ID Orig. computer Test computer
USCD1239/02 PC Windows PC Windows
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3. DESCRIPTION OF PROGRAM OR FUNCTION

VENTEASY is an easy-to-use neutronics code that was derived from the code module VENTNEUT in the BOLD VENTURE code system (Reference below).
  
The geometries that may be used are:
One dimension - Slab (X), Cylinder (R), Sphere (S)
Two Dimension - X-Y, R-Z, THETA-R, Triangle (T), Hexagon (H)
Three Dimensions - X-Y-Z, THETA-R-Z, T-Z, H-Z
  
Cross sections may be macroscopic or microscopic.
  
Types of problems that may be solved are:
- Multiplication factor (Keffective)
- Adjoint
- Criticality search for a desired Keffective by adjusting dimensions, nuclide concentrations, or buckling.
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4. METHODS

The finite-difference representation of diffusion theory or a simple P1approximation is used. Neutron-flux-eigenvalue problems are solved by direct inner-outer iterations with restrained line overrelaxtion. Asymptotic flux extrapolation is used when distinct error modes are established. The eigenvalue of a problem is calculated each outer iteration from an overall neutron balance; however, source ratios are used in some situations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The sizes of problems that may be solved are restricted only by the size of the computer memory.
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6. TYPICAL RUNNING TIME

Using an AMD Sempron Processor 3400+ (Speed 1803 MHz), and 1 GB DDR2 SDRAM at 533MHz; the two group-three dimensional IAEA benchmark problem (sample problems 20 and 27) required:
Mesh 17x17x19 - approximately 1 second
Mesh 136x136x152 - approximately 10 minutes
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7. UNUSUAL FEATURES

In the output data file, the input data for a problem is listed prior to the output data, and there is a condensed output data file that shows only minimum output.
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8. RELATED OR AUXILIARY PROGRAMS

VENTEASY uses the following code modules from the BOLD VENTURE code system (Reference below). STARTER, DRIVER, CROSPROS, INDCMACR, INDCRSPR, INDENMAN, INDUTLIN, INDVENTR, INPROSER, PERTUBAT, WRITCTL, WRAPERUP.
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9. STATUS
Package ID Status date Status
USCD1239/02 13-OCT-2011 Tested at NEADB
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10. REFERENCES

- D.R. Vondy, T.B. Fowler, G.W. Cunningham III:
The BOLD VENTURE Computation System for Nuclear Reactor Core Analysis, Version III. ORNL-5711 - June 1981.
USCD1239/02, included references:
- J-P. Renier, T.B. Fowler: VENTEASY USER'S MANUAL
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11. HARDWARE REQUIREMENTS:  A PC with, ideally, 1GB or more of memory (RAM).
USCD1239/02
Tested at the NEA Databank on a Dell INTEL Duo E6550, 2.33 GHz (for Windows); DOS, under Windows XP Pro SP 3.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
USCD1239/02 FORTRAN
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13. SOFTWARE REQUIREMENTS:  Microsoft Windows.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

John-Paul Renier
Knoxville, TN 37830
USA

Tom B. Fowler
Oak Ridge, TN 37830
USA
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16. MATERIAL AVAILABLE
USCD1239/02
Instructions For Running VENTEASY
VENTEASY User's manual
Executable files
Lahey compiler error message file
output files
Input sample problems
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17. CATEGORIES
  • AM. Nuclear Models
  • C. Static Design Studies
  • K. Reactor Systems Analysis

Keywords: P1-approximation, adjoint, buckling, criticality, diffusion, eigenvalues, finite difference method.