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Title: MPACT Theory Manual, Version 2.2.0

Abstract

This theory manual describes the three-dimensional (3-D) whole-core, pin-resolved transport calculation methodology employed in the MPACT code. To provide sub-pin level power distributions with sufficient accuracy, MPACT employs the method of characteristics (MOC) solutions in the framework of a 3-D coarse mesh finite difference (CMFD) formulation. MPACT provides a 3D MOC solution, but also a 2D/1D solution in which the 2D planar solution is provided by MOC and the axial coupling is resolved by one-dimensional (1-D) lower order (diffusion or P3) solutions. In Chapter 2 of the manual, the MOC methodology is described for calculating the regional angular and scalar fluxes from the Boltzmann transport equation. In Chapter 3, the 2D/1D methodology is described, together with the description of the CMFD iteration process involving dynamic homogenization and solution of the multigroup CMFD linear system. A description of the MPACT depletion algorithm is given in Chapter 4, followed by a discussion of the subgroup and ESSM resonance processing methods in Chapter 5. The final Chapter 6 describes a simplified thermal hydraulics model in MPACT.

Authors:
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  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Core Physics, Inc., Cary, NC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Consortium for Advanced Simulation of LWRs (CASL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340449
Report Number(s):
ORNL/TM-2016/476
CASL-U-2016-1107-000; TRN: US1701506
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 97 MATHEMATICS AND COMPUTING; MANUALS; MATHEMATICAL SOLUTIONS; BOLTZMANN EQUATION; THERMAL HYDRAULICS; ALGORITHMS; TRANSPORT THEORY; ONE-DIMENSIONAL CALCULATIONS; POWER DISTRIBUTION; THREE-DIMENSIONAL CALCULATIONS; ACCURACY; RESONANCE; SCALARS; M CODES; FINITE DIFFERENCE METHOD; TWO-DIMENSIONAL CALCULATIONS; REACTOR CORES

Citation Formats

Downar, Thomas, Collins, Benjamin S., Gehin, Jess C., Godfrey, Andrew T., Jabaay, Daniel, Kelley, Blake W., Clarno, Kevin T., Kim, Kang, Kochunas, Brendan, Larsen, Edward W., Liu, Yuxuan, Liu, Zhouyu, Martin, William R., Palmtag, Scott, Rose, Michael, Saller, Thomas, Stimpson, Shane, Trahan, Travis, Wang, J. W., Wieselquist, William A., Young, Mitchell, and Zhu, Ang. MPACT Theory Manual, Version 2.2.0. United States: N. p., 2016. Web. doi:10.2172/1340449.
Downar, Thomas, Collins, Benjamin S., Gehin, Jess C., Godfrey, Andrew T., Jabaay, Daniel, Kelley, Blake W., Clarno, Kevin T., Kim, Kang, Kochunas, Brendan, Larsen, Edward W., Liu, Yuxuan, Liu, Zhouyu, Martin, William R., Palmtag, Scott, Rose, Michael, Saller, Thomas, Stimpson, Shane, Trahan, Travis, Wang, J. W., Wieselquist, William A., Young, Mitchell, & Zhu, Ang. MPACT Theory Manual, Version 2.2.0. United States. doi:10.2172/1340449.
Downar, Thomas, Collins, Benjamin S., Gehin, Jess C., Godfrey, Andrew T., Jabaay, Daniel, Kelley, Blake W., Clarno, Kevin T., Kim, Kang, Kochunas, Brendan, Larsen, Edward W., Liu, Yuxuan, Liu, Zhouyu, Martin, William R., Palmtag, Scott, Rose, Michael, Saller, Thomas, Stimpson, Shane, Trahan, Travis, Wang, J. W., Wieselquist, William A., Young, Mitchell, and Zhu, Ang. Thu . "MPACT Theory Manual, Version 2.2.0". United States. doi:10.2172/1340449. https://www.osti.gov/servlets/purl/1340449.
@article{osti_1340449,
title = {MPACT Theory Manual, Version 2.2.0},
author = {Downar, Thomas and Collins, Benjamin S. and Gehin, Jess C. and Godfrey, Andrew T. and Jabaay, Daniel and Kelley, Blake W. and Clarno, Kevin T. and Kim, Kang and Kochunas, Brendan and Larsen, Edward W. and Liu, Yuxuan and Liu, Zhouyu and Martin, William R. and Palmtag, Scott and Rose, Michael and Saller, Thomas and Stimpson, Shane and Trahan, Travis and Wang, J. W. and Wieselquist, William A. and Young, Mitchell and Zhu, Ang},
abstractNote = {This theory manual describes the three-dimensional (3-D) whole-core, pin-resolved transport calculation methodology employed in the MPACT code. To provide sub-pin level power distributions with sufficient accuracy, MPACT employs the method of characteristics (MOC) solutions in the framework of a 3-D coarse mesh finite difference (CMFD) formulation. MPACT provides a 3D MOC solution, but also a 2D/1D solution in which the 2D planar solution is provided by MOC and the axial coupling is resolved by one-dimensional (1-D) lower order (diffusion or P3) solutions. In Chapter 2 of the manual, the MOC methodology is described for calculating the regional angular and scalar fluxes from the Boltzmann transport equation. In Chapter 3, the 2D/1D methodology is described, together with the description of the CMFD iteration process involving dynamic homogenization and solution of the multigroup CMFD linear system. A description of the MPACT depletion algorithm is given in Chapter 4, followed by a discussion of the subgroup and ESSM resonance processing methods in Chapter 5. The final Chapter 6 describes a simplified thermal hydraulics model in MPACT.},
doi = {10.2172/1340449},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {6}
}

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