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Title: Redwing: A MOOSE application for coupling MPACT and BISON

Fuel performance and whole core neutron transport programs are often used to analyze fuel behavior as it is depleted in a reactor. For fuel performance programs, internal models provide the local intra-pin power density, fast neutron flux, burnup, and fission rate density, which are needed for a fuel performance analysis. The fuel performance internal models have a number of limitations. These include effects on the intra-pin power distribution by nearby assembly elements, such as water channels and control rods, and the further limitation of applicability to a specified fuel type such as low enriched UO2. In addition, whole core neutron transport codes need an accurate intra-pin temperature distribution in order to calculate neutron cross sections. Fuel performance simulations are able to model the intra-pin fuel displacement as the fuel expands and densifies. These displacements must be accurately modeled in order to capture the eventual mechanical contact of the fuel and the clad; the correct radial gap width is needed for an accurate calculation of the temperature distribution of the fuel rod. Redwing is a MOOSE-based application that enables coupling between MPACT and BISON for transport and fuel performance coupling. MPACT is a 3D neutron transport and reactor core simulator basedmore » on the method of characteristics (MOC). The development of MPACT began at the University of Michigan (UM) and now is under the joint development of ORNL and UM as part of the DOE CASL Simulation Hub. MPACT is able to model the effects of local assembly elements and is able calculate intra-pin quantities such as the local power density on a volumetric mesh for any fuel type. BISON is a fuel performance application of Multi-physics Object Oriented Simulation Environment (MOOSE), which is under development at Idaho National Laboratory. BISON is able to solve the nonlinearly coupled mechanical deformation and heat transfer finite element equations that model a fuel element as it is depleted in a nuclear reactor. Redwing couples BISON and MPACT in a single application. Redwing maps and transfers the individual intra-pin quantities such as fission rate density, power density, and fast neutron flux from the MPACT volumetric mesh to the individual BISON finite element meshes. For a two-way coupling Redwing maps and transfers the individual pin temperature field and axially dependent coolant densities from the BISON mesh to the MPACT volumetric mesh. Details of the mapping are given. Redwing advances the simulation with the MPACT solution for each depletion time step and then advances the multiple BISON simulations for fuel performance calculations. Sub-cycle advancement can be applied to the individual BISON simulations and allows multiple time steps to be applied to the fuel performance simulations. Currently, only loose coupling where data from a previous time step is applied to the current time step is performed.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
1173105
Report Number(s):
INL/CON--14-32800
TRN: US1500022
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: American Nuclear Society Winter Meeting 2014, Anaheim, CA (United States), 9-13 Nov 2014
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; FAST NEUTRONS; FINITE ELEMENT METHOD; NEUTRON TRANSPORT; NUCLEAR FUELS; PERFORMANCE; COMPUTERIZED SIMULATION; MATHEMATICAL MODELS; THREE-DIMENSIONAL CALCULATIONS; M CODES; B CODES; R CODES; IDAHO NATIONAL LABORATORY; POWER DENSITY; COUPLING; URANIUM DIOXIDE; ORNL; FISSION; FUEL PINS; FUEL RODS; CONTROL ELEMENTS; HEAT TRANSFER; REACTOR CORES; TEMPERATURE DISTRIBUTION; CROSS SECTIONS; NONLINEAR PROBLEMS; POWER DISTRIBUTION; BURNUP; DEFORMATION; FINITE ELEMENT METHOD; MAPPING; REACTORS BISON; Fuels Performance; MOOSE; Neutronics; Redwing; COUPLING