MPACT Verification and Validation Manual (V.4.3)

Downar, Thomas J.; Kochunas, Brendan; Liu, Yuxuan; Stimpson, Shane; Graham, Aaron

doi:10.2172/1887704

Cited by 4 publications

(7 citation statements)

References 17 publications

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“…With P 2 scattering, all RMS pin and assembly power are differences below 1%, and all RMS axial power differences are below 1.65%. These results are comparable to previous results from the VERA progression problems benchmark [1,19] and below the accuracy goals outlined in [12,15]. Regarding the hot full power 3-D core depletion, there was some variation in the critical boron concentration calculated by MPACT compared to nTRACER and DeCART.…”

Section: Discussionsupporting

confidence: 85%

“…MPACT is a 3-D full-core neutron transport code capable of calculating subpin level power distribution [1]. Calculations are based on multigroup Boltzmann neutron transport equation.…”

Section: Methodologies In Mpactmentioning

confidence: 99%

“…Comparison of simulation to experiment to establish validation is the gold standard. MPACT and VERA have been extensively validated [1][2][3], and only recently has the validation of high-fidelity deterministic transport codes for the calculation of intra-pin reaction rate distributions been established [4]. However, in many cases, high quality validation data may not be available for a variety of reasons.…”

Section: Introductionmentioning

confidence: 99%

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Verification of MPACT for the APR1400 Benchmark

et al. 2021

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This paper describes benchmark calculations for the APR1400 nuclear reactor performed using the high-fidelity deterministic whole-core simulator MPACT compared to reference solutions generated by the Monte Carlo code McCARD. The methodology presented in this paper is a common approach in the field of nuclear reactor analysis, when measured data are not available for comparison, and may be more broadly applied in other simulation applications of energy systems. The benchmark consists of several problems that span the complexity of single pins to a hot full power cycle depletion. Overall, MPACT shows excellent agreement compared to the reference solutions. MPACT effectively predicts the reactivity for different geometries and several temperature and boron conditions. The largest deviation from McCARD occurs for cold zero conditions in which the fuel, moderator, and cladding are all 300 K. Possible reasons for this are discussed. Excluding these cases, the ρ reactivity difference from McCARD is consistently below 100 pcm. For single fuel pin problems, the highest error of 151 pcm occurs for the lowest fuel enrichment of 1.71 wt.% UO2, indicating possible, albeit small, enrichment bias in MPACT’s cross-section library. Furthermore, MOC and spatial mesh parametric studies indicate that default meshing parameters and options yield results comparable to finely meshed cases. Additionally, there is very good agreement of the radial and axial power distributions. RMS radial pin and assembly power differences for all cases are at or below 0.75%, and all RMS axial power differences are below 1.65%. These results are comparable to previous results from the VERA progression problems benchmark and meet generally accepted accuracy criteria for whole-core transport codes.

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Section: Discussionsupporting

confidence: 85%

“…MPACT is a 3-D full-core neutron transport code capable of calculating subpin level power distribution [1]. Calculations are based on multigroup Boltzmann neutron transport equation.…”

Section: Methodologies In Mpactmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Verification of MPACT for the APR1400 Benchmark

et al. 2021

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“…Instead, the effective β τ,iso are pre-generated using typical fission rates from a PWR configuration. Recently, an option has been added in MPACT to evaluate β τ,iso on the fly using ν (τ) d,g ,iso from other kinetics data sets [36].…”

Section: Transient Data Calculationmentioning

confidence: 99%

MPACT 4.4 Theory Manual

Graham,

Larsen,

Collins

et al. 2023

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Section: Transient Data Calculationmentioning

confidence: 99%

MPACT Theory Manual (V.4.3)

Larsen

Collins²,

Kochunas

et al. 2022

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This manual presents the theory underlying the three-dimensional (3D) whole-core, pin-resolved neutron transport calculation methodologies employed in the MPACT code. MPACT's primary goal is to provide accurate sub-pin power distributions in a computationally efficient manner. To accomplish this, MPACT offers several different transport method options. The 2D/1D method, in which 3D problems are decomposed into an axial stack of radial "slices," is currently the most commonly used. In this option, two-dimensional (2D) planar solutions are provided by the method of characteristics (MOC), and axial solutions are provided via one-dimensional (1D) approximate diffusion, or P 3 solutions. The radial and axial solutions are coupled by (i) axial and radial transverse leakages, and (ii) a global 3D coarse mesh finite difference (CMFD) solve, which provides both acceleration and stability to the solution iteration scheme.The subsequent chapters of this manual present a range of topics, including MOC, CMFD, axial nodal transport solvers, 2D/1D, self-shielding, depletion, thermal-hydraulics, and transient methods. Development of the underlying theory of the 2D/1D method is presented, diagrams are included to highlight important algorithmic flow, and important concepts are discussed as appropriate. This manual is intended to be selfsufficient, but references to published articles and other materials are included for further reading.MPACT is a relatively new code, with new capabilities and many computational methods that did not exist until recently. This manual is an even newer document, with chapters written by several different code contributors working under time constraints. For these reasons, the manual is not yet complete and finalized.

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MPACT Verification and Validation Manual (V.4.3)

Abstract: B.3 Application of MMS to an MOC-Based Transport Solver .

Cited by 4 publications

References 17 publications

Verification of MPACT for the APR1400 Benchmark

Verification of MPACT for the APR1400 Benchmark

MPACT 4.4 Theory Manual

MPACT Theory Manual (V.4.3)

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