3. DESCRIPTION OF PROBLEM OR FUNCTION
MARS-ORNL is a selection of computer codes for the generation of problem-dependent multigroup cross section libraries. They are selected modules from the AMPX-2 system for AMPX interface format libraries, LASL codes for CCCC interfaces, and processing codes for libraries to be used by ANISN, DOT, or MORSE codes. The codes in the collection are used in connection with the following DLC data libraries: ZZ-LIB-IV (DLC-0040), ZZ-VITAMIN-C (DLC-0041), VITAMIN-4C (DLC-0053), ZZ-CLEAR/42B (DLC-0042), ZZ-CSRL/43B (DLC-0043), and EPRMASTER (DLC-0052).
The functions of these processing codes are briefly described:
A. AMPX Modules
AIM: Converts AMPX Master Interface Files from EBCDIC to binary form and back.
AJAX: Merges, collects, assembles, re-orders, joins, and copies selected nuclides from AMPX Master Interfaces.
BONAMI: Accesses Bondarenko factors from an AMPX Master Library and performs resonance self-shielding calculations.
CHOX: Produces a coupled interface library in AMPX format by combining neutron libraries (generated by module XLACS), gamma libraries (generated by module SMUG), and photon production libraries (generated by module LAPHNGAS).
CHOXM: Combines self-shielding factors as generated by the code SPHINX (PSR-0129) and an infinite dilution neutron master interface (generated by XLACS) to generate a self-shielded neutron AMPX Interface File. The interface produced by CHOXM is an input to the NITAWL module of AMPX. CHOXM is a modified version of CHOX.
COMAND: Collapses ANISN cross section libraries.
DIAL: Produces edits from AMPX Master Interfaces.
ICE-II: Accepts cross sections from an AMPX working library and produces mixed cross sections in four formats: (1) AMPX working library format; (2) ANISN format; (3) group-independent ANISN format; (4) Monte Carlo processed cross section library format.
NITAWL: Produces self-shielded and working corss section libraries in the formats required by the ANISN, DOT, or MORSE codes. The resonance self-shielding calculation generally employs the Nordheim Integral Treatment, though the narrow resonance and an infinite mass treatment are available as alternate methods.
PAL: Allows to punch the one-dimensional cross section arrays on an AMPX interface either in fixed form or in the free-form FIDO format.
RADE: Performs consistency checks on the neutron, gamma, or coupled neutron-gamma multigroup cross section libraries produced by the various AMPX modules.
XSDRNPM: (1) Provides a one-dimensional transport calculation capability for calculating reaction rates, eigenvalues and critical dimensions; (2) allows spatial cross section weighting to be performed. The collapsed cross sections are written as an AMPX weighted library to be used for transport calculations or are written in ANISN, DOT, or MORSE formats.
B. CCCC Codes
LASIP-3 (see abstract NESC0691): Converts CCCC interface files from free-field BCD format to well-defined binary files.
LINX: Merges ISOTXS or BRKOXS multigroup cross section libraries in the CCCC format for use by the MINX processing code (see abstract PSR-0105).
BINX: Converts any ISOTXS, BRKOXS, or DCAYXS libraries from binary to BCD mode or back.
CINX: Collapses multigroup cross section libraries in CCCC format (ISOTXS, BLKOXS, DLAYXS) to a subset of the original group structure to be used with the MINX (PSR-0105)/SPHINX (PSR-0129) cross section processing system.
SPHINX (see abstract PSR-0129): Generates space and energy collapsed neutron cross sections for a given reactor size and composition, by interpolation on Bondarenko-type cross sections.
I2D: Converts neutron cross section data written in CCCC file format (ISOTXS) to DTF matrix tables.
GIP: Reads nuclide-organized cross section libraries prepared for ANISN or DOT and prepares a group-organized library.