VENTEASY: A small version of BOLD VENTURE used to perform the VENTNEUT neutronics calculations.
Tom-Bill Fowler and John-Paul Renier, Oak Ridge, TN
FORTRAN, Windows PC running a DOS command line (C00776PCX8600).
The BOLD VENTURE code system is a powerful, but complicated system to use. It consists of many independent computational modules, each of which performs separate tasks. Communication between the modules is done with pre-defined interface data files that are written (and or read) by other modules of the system. One of the neutronics modules, VENTNEUT, is included in the system, and it was felt that an independent, easy-to-use code should be created from this module.
The code VENTEASY is the result of this effort. No knowledge of any of the other modules in BOLD VENTURE is needed to run VENTEASY, although the following modules are used: VENTNEUT, DRIVER, SRARTER, WRITCTL, DMACR, CROSPROS, PROSER, DVENTR, DUTLIN, DENMAN, PERTUBAT, and WRAPERUP.
VENTEASY may be thought of as a small version of BOLD VENTURE, but its purpose is only to perform the VENTNEUT neutronics calculation.
One dimensional – Slab (X), Cylinder ®, Sphere (s)
Two dimension – X-Y, R-Z, THETA-R, TRIANGAL (T), HEAXGON (H)
Three dimensions – X-Y-Z, THATA-R-Z, T-Z, H-Z
The finite difference representation of diffusion theory or simple approximation is used. Neutron-flux-eigenvalue problems are solved by direct inner-outer iterations with restrained line overrelaxation. Asymtotic flux extrapolation is used when distinct error modes are established. The eigen value of a problem is calculated each outer iteration from an overall neutron balance; however, source ratios are used in some situations.
The sizes of problems that may be solved are restricted only by the computer memory. Prior to the start of a calculation, the code determines the size of the computer memory that is available that the code needs for the problem.
The running time depends on the case and the calculation parameters. Using an ADM Sempron Processor 3000+ Speed 1803 MHz, A two group three-dimensional problem using a mesh of 136,136,152 points requires 13 minutes.
VENTEASY runs on standard PC workstations. Memory demand may become a limiting factor. At least 1 GB of RAM is recommended.
VENTEASY has been developed under Windows PC DOS operating systems. The source code is not included.
John-Paul Renier and Tom-Bill Fowler, VENTEASY USER’S MANUAL.
Instructions for running and run time doc.
The package is transmitted as a self-extracting zip file on CD which includes the referenced documents, executable files and example problems.
October 2010.
KEYWORDS: CRITICALITY CALCULATIONS, DIFFUSION THEORY, FINITE ELEMENT METHOD.