Los 5-5Version 3.0 iii 16-19Version 3.0 ix Table 5.2: Table 6.1: Table 6.2: Table 7.1: Table 7.2: -. The DANTSYS code package includes the following transport codes: ONEDANT, TWODANT, TWODANT/GQ, TWOHEX, and THREEDANT. This document is the central user, methods and programming documentation for the system of codes. LIST OF FIGURES LIST OF FIGURESThe DANTSYS code package is a modular computer program package designed to solve the time-independent, multigroup discrete ordinates form of the Boltzmann transport equation in several different geometries. The modular construction of the package separates the input processing, the transport equation solving, and the post processing (or edit) functions into distinct code modules: the Input Module, one or more Solver Modules, and the Edit Module, respectively. The Input and Edit Modules are very general in nature and are common to all the Solver Modules. The ONEDANT Solver Module contains a one-dimensional (slab, cylinder, and sphere), time-independent transport equation solver using the standard diamond-differencing method for space/angle discretization. It was previously documented in Ref.1. Also included in the package are Solver Modules named TWODANT, TWODANT/GQ, THREEDANT, and TWOHEX. The TWODANT Solver Module solves the time-independent two-dimensional transport equation using the diamond-differencing method for space/angle discretization and was previously documented in Ref. 2. We have also introduced an adaptive weighted diamond differencing (AWDD) method for the spatial and angular discretization into TWODANT as an option. The TWOHEX Solver Module solves the time-independent two-dimensional transport equation on an equilateral triangle spatial mesh. The user's guide for TWOHEX was previously documented in Ref. The THREEDANT SolverModule solves the time independent, three-dimensional transport equation for XYZ and RZO symmetries using both diamond differencing with set-to-zero fixup and the AWDD method. The TWODANT/GQ Solver Module solves the two-dimensional transport equation in X Y and RZ symmetries using a spatial mesh of arbitrary quadrilaterals. The spatial differencing method is based upon the diamond differencing method with set-tozero fixup with changes to accommodate the generalized spatial meshing.This manual describes the standardized Input and Edit Modules together with each of the Solvers in the package. Throughout this manual we will refer to this package as the DANTSYS code package.Some of the major features included in the DANTSYS code package are: a free-field format ASCII text input capability;standardized, data-and file-management techniques as defined and developed by the Module solves the time independent, three-dimensional transport equation for XYZ and RZO symmetries using both diamond differencing with set-to-zero fixup and the AWDD method. The TWODANTIGQ Solver Module solves the two-dimensional transport equation in X Y and RZ symmetries using a spatial mesh of arbitrary quadrilaterals. The spatial differencing meth...

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1. Program Identification: ONEDANT 2. Computer for which Program is Designed: CDC-76OO, but the program has been implemented and run on tht IBM-370/190 and CRAY-I computers. 3. Function: ONEDANT solves the one-dimensional multigroup transport equation in plane, cylindrical, spherical, and two-angle plane geometries. Both regular and adjoint, inhomogeneous and homogeneous (k. and eigenvalue search) problems subject to vacuum, reflective, perioaic, white, albedo, or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is allowed and anisotropic inhomogeneous sources are permitted. 6. Running Time: Running time is directly related to problem size and to cen¬ tral processor and data transfer speeds. On the CDC-7600 a 70 energygroup, S ,, P-scatter, 40 space-point eigenvalue problem requires about A0 sec CPU time. A 42 energy-group, S_, P-scatter, 121 space-point fixed-source problem requires about 30 sec CPU time on the CDC-7600. A 1 energy-group, S,", P scatter, 307 space-point fixed-source problem requires from 2 to 3 sec CPU time on the CDC-7600. Generally, then, on the CDC-7600, the running times for ONEDANT will range from a few seconds to 1 or 2 minutes. 'I. Unvisual Features of the Program: The ONEDANT code package is modularly struc¬ tured in a form that separates the input and the output (or edit) func¬ tions from the main calculational (or solver) section of the code. The code makes use of binary, sequential data files,called interface files, io transmit data between modules and submodules. Standard interface files whose specifications have been defined by the Reactor Physics Committee on Computer Code Coordination are accepted, used, and cheated by the code. A totally new free-field card-image input capability is provided for the user. The code provides the user with considerable flexibility in using both card-image or sequential file input and also in controlling the execution of both modules and submodules. Separate versions of the code exist for short-word and long-word computers. 8. Programming Languages: The program is written in standard FORTRAN-IV language. 10. Material Available: Source deck (about 30 000 card-images), sample problems and this manual have been submitted to the Argonne Code Center and to the Radiation Shielding Information Center. viii I.

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