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Implementation of the Sanchez-Pomraning Double Heterogeneity Treatment Method in DeCART
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- Authors
- Issue Date
- 2007-09
- Keywords
- Double Heterogeneity ; MOC ; DeCART ; Subgroup
- Abstract
- The Sanchez-Pomraning method to resolve the double heterogeneity (DH) in the method of
characteristics (MOC) transport calculation, which we call DH MOC, is implemented into
the DeCART code for the application of the DeCART code to the gas cooled reactors
involving particulate triso fuels. Since the DH MOC requires essentially no modification of
the existing MOC calculation module other than providing the effective macroscopic cross
section and the effective source constructed from the stochastic material properties and
micro regional source, implementation is focused on the variable structure changes to
incorporate micromaterials and the pre and post processing for the DH MOC calculation.
The DH MOC solver is incorporated first in the shielded resonance cross section
determination and then as in the normal MOC transport solution. As a prerequisite for the
implementation of the DH MOC solver, a method to determine the volume to volume
collision probabilities (CP) for a sphere is derived in detail. The verification of the CP
routines and other code modifications are performed using various analytical solutions. The
final verification of the DH MOC is performed by comparing the DeCART DH MOC results
with the MCNP results obtained with an explicit representation of the particulate fuels. The
effect of double heterogeneity on the resonance cross section and on the normal MOC
transport calculation are assessed separately.
- Language
- English
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