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Title: SUBGR: A Program to Generate Subgroup Data for the Subgroup Resonance Self-Shielding Calculation

The Subgroup Data Generation (SUBGR) program generates subgroup data, including levels and weights from the resonance self-shielded cross section table as a function of background cross section. Depending on the nuclide and the energy range, these subgroup data can be generated by (a) narrow resonance approximation, (b) pointwise flux calculations for homogeneous media; and (c) pointwise flux calculations for heterogeneous lattice cells. The latter two options are performed by the AMPX module IRFFACTOR. These subgroup data are to be used in the Consortium for Advanced Simulation of Light Water Reactors (CASL) neutronic simulator MPACT, for which the primary resonance self-shielding method is the subgroup method.
Authors:
 [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
1261346
Report Number(s):
ORNL/TM--2016/154; CASL-U--2016-1071-000
NT0304000; NEAF343; CASL-U-2016-1070-000; TRN: US1601587
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Consortium for Advances Simulation of LWRs (CASL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; WATER MODERATED REACTORS; RESONANCE; SELF-SHIELDING; WATER COOLED REACTORS; CROSS SECTIONS; APPROXIMATIONS; DATA; M CODES; ENERGY RANGE; SIMULATION; S CODES; ENERGY LEVELS