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Title: The Method of Characteristics for 2-D Multigroup and Pointwise Transport Calculations in SCALE/CENTRM

Abstract

SCALE 6 computes problem-dependent multigroup (MG) cross sections through a combination of the conventional Bondarenko shielding-factor method and a deterministic pointwise (PW) transport calculation of the fine-structure spectra in the resolved resonance and thermal energy ranges. The PW calculation is performed by the CENTRM code using a 1-D cylindrical Wigner-Seitz model with the white boundary condition instead of the real rectangular cell shape to represent a lattice unit cell. The pointwise fluxes computed by CENTRM are not exact because a 1-D model is used for the transport calculation, which introduces discrepancies in the MG self-shielded cross sections, resulting in some deviation in the eigenvalue. In order to solve this problem, the method of characteristics (MOC) has been applied to enable the CENTRM PW transport calculation for a 2-D square pin cell. The computation results show that the new BONAMI/CENTRM-MOC procedure produces very precise self-shielded cross sections compared to MCNP reaction rates.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1039611
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: PHYSOR 2012 - Advances in Reactor Physics - Linking Research, Industry, and Education, Knoxville, TN, USA, 20120415, 20120420
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; BOUNDARY CONDITIONS; CROSS SECTIONS; EDUCATION; ENERGY RANGE; FINE STRUCTURE; REACTION KINETICS; REACTOR PHYSICS; RESONANCE; SHAPE; SPECTRA; TRANSPORT

Citation Formats

Kim, Kang Seog, and Williams, Mark L. The Method of Characteristics for 2-D Multigroup and Pointwise Transport Calculations in SCALE/CENTRM. United States: N. p., 2012. Web.
Kim, Kang Seog, & Williams, Mark L. The Method of Characteristics for 2-D Multigroup and Pointwise Transport Calculations in SCALE/CENTRM. United States.
Kim, Kang Seog, and Williams, Mark L. 2012. "The Method of Characteristics for 2-D Multigroup and Pointwise Transport Calculations in SCALE/CENTRM". United States.
@article{osti_1039611,
title = {The Method of Characteristics for 2-D Multigroup and Pointwise Transport Calculations in SCALE/CENTRM},
author = {Kim, Kang Seog and Williams, Mark L},
abstractNote = {SCALE 6 computes problem-dependent multigroup (MG) cross sections through a combination of the conventional Bondarenko shielding-factor method and a deterministic pointwise (PW) transport calculation of the fine-structure spectra in the resolved resonance and thermal energy ranges. The PW calculation is performed by the CENTRM code using a 1-D cylindrical Wigner-Seitz model with the white boundary condition instead of the real rectangular cell shape to represent a lattice unit cell. The pointwise fluxes computed by CENTRM are not exact because a 1-D model is used for the transport calculation, which introduces discrepancies in the MG self-shielded cross sections, resulting in some deviation in the eigenvalue. In order to solve this problem, the method of characteristics (MOC) has been applied to enable the CENTRM PW transport calculation for a 2-D square pin cell. The computation results show that the new BONAMI/CENTRM-MOC procedure produces very precise self-shielded cross sections compared to MCNP reaction rates.},
doi = {},
url = {https://www.osti.gov/biblio/1039611}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}

Conference:
Other availability
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