Showing papers in "Nuclear Engineering and Design in 2019"

TL;DR: The Lagrangian moving particle semi-implicit (MPS) method is potential for such spreading flow with both free surface and crust-melt interface, and a new solution algorithm is proposed for particle methods to eliminate such numerical creeping, so that creeping velocity decreases proportionally with viscosity rise as mentioned in this paper.

TL;DR: In this article, the authors outline strategies for the treatment and processing of MSR-type wastes from concepts of reconditioning and recycle of certain components to partitioning and direct immobilization of other waste components.

TL;DR: In this article, two methods, the additional force and dynamic mesh of Arbitrary Lagrangian-Eulerian (ALE) method, are compared, the result shows these two methods are in accordance to calculate the effect of rolling.

TL;DR: A data-driven framework is formulated and demonstrated to estimate simulation error and suggest optimal selection of computational mesh size and constitutive correlations for low-f fidelity, coarse-mesh thermal-hydraulic simulation, in order to achieve accuracy comparable to that of high-fidelity simulation.

TL;DR: In this article, a thorium-based fuel platform for the proposed marine core was proposed and compared with the UO2-UO2 duplex fuel core. And the duplex core is the more successful design, giving a core life of ∼ 16 years and a reactivity swing of less than 2500 pcm, while satisfying all neutronic safety parameters.

TL;DR: A method for defining the critical point of water film rupture on corrugated plate wall is proposed by the application of the SIFT (Scale-invariant feature transform) feature selection algorithm and SVM (Support Vector Machine) classification method to avoid the introduction of human identification error.

TL;DR: Simulation results indicate that the new control system can enhance the transient response in contrast to the conventional PID, and performance comparison of the FOPID regulator with the classical PID shows that the fractional controller has huge superiority which is comparable with the advanced quantitative feedback theory (QFT) controller.

TL;DR: In this article, a comparison of selected supercritical water-cooled nuclear-Reactor (SCWR) heat-transfer correlations has shown that their results may differ from one to another by more than 200%.

TL;DR: In this article, Wu et al. applied model order reduction to the results of direct numerical simulation of a low-momentum laminar jet discharged into a Laminar channel crossflow through a circular orifice.

TL;DR: In this paper, the measurement approach with the 2D PIV has been optimized systematically and the systematic and random errors are analyzed, including perspective error and displacement variation error, which are quantified and used to correct the measured results.

TL;DR: The study will show that ASR can reduce the structural capacity of a NCVS, and the impact will be much greater for high probability low intensity ground motions than for the low probability high intensity ones.

TL;DR: In this paper, a double-suction impeller for low-medium specific speed double suction centrifugal pumps (n q 60 ) is proposed, which is characterized by a new arrangement of its flow channels, which come up alternately on the same circumferential exit even if they start from two different sides.

TL;DR: In this article, the Explicit Moving Particle Simulation (EMPS) method is employed to reproduce the transport of rigid body in free surface flows in case of an internal or external flooding accident.

TL;DR: In this article, the authors derived and validated a model for calculating the critical airflow velocity of water film breakdown at the corner of the corrugated plate (CP) dryer.

TL;DR: This paper proposes an approach for the VUQ of a two-fluid model-based MCFD solver based on a data-driven Bayesian framework that relies on Bayesian inference to inversely quantify the parameter uncertainty and model form uncertainty and then propagate the obtained uncertainties through the solver to obtain the uncertainties of the QoI predictions.

TL;DR: In this paper, the self-shielding corrections on DPA cross sections are necessary for the computation of atomic displacement, which depends not only on the cross sections but also the corresponding recoil energies of the PKA.

TL;DR: In this paper, the authors improved the original Moving Particle Semi-Implicit (MPS) method by including the explicit pressure calculation model to reduce the computational cost and enhance the computational speed.

TL;DR: In this paper, the authors report an assessment of four different turbulent heat flux closures for applications involving low-Prandtl fluids, including the Reynolds analogy based on a constant turbulent Prandtl number, a four-equation explicit algebraic heat flux model (AHFM), a threeequation implicit AHFM called AHFM-NRG, and a nonlinear second-order heat flux (TMBF) model.

TL;DR: Yang et al. as discussed by the authors presented a brief summary of some ongoing key issues concerning various aspects of CFD modeling, subchannel analysis, rod bundle experiments, and rod bundle critical heat flux (CHF) modeling and prediction.

TL;DR: In this paper, the critical heat flux of potential accident tolerant fuel (ATF) cladding materials and concepts, Cr and FeCrAl coatings on zirconium-alloy substrates, were investigated experimentally.

TL;DR: In this paper, a multiphysics OpenFOAM solver for the analysis of the MSFR helium bubbling system and its effect on reactivity is presented, where the presence of bubbles inside the reactor is handled with a two-fluid thermal-hydraulics module, previously implemented into the solver.

TL;DR: In this article, the authors present a benchmark for stratification erosion in a vessel where the upper region contained initially a mixture of steam and helium, and the remaining volume was filled with steam.

TL;DR: The present paper deals with an overview of BEPU features and applications including constitutive elements and of sample applications.

TL;DR: AC2 2019 as discussed by the authors is the most recent version of AC2 for safety analyses of nuclear reactors from normal operation to severe accidents, which includes three new modules: AIDA, ATHLET-CD and COCOSYS 3.0.

TL;DR: In this paper, a numerical activity aimed to evaluate the capability of RELAP5-3D to reproduce the main thermal-hydraulic phenomena in an HLM pool-type facility, in different operative conditions, is presented.

TL;DR: This work is precisely devoted to the development of a first good practice guidance document for quantification of thermal-hydraulic code model input uncertainty, and provides a summary of the main project outcome.

TL;DR: In this article, the influence of flow blockage on rod surface temperature and cross flow was investigated using three-dimensional flow and temperature distributions of LBE-cooled 19-pin wire-wrapped bundle.

TL;DR: In this article, the U3Si2-SiC fuel system was evaluated and the most limiting fuel rod was selected based on the calculated chemically vapor deposited (CVD) failure risk from the full core simulation.

TL;DR: In this article, a high-scalable and high-performance spectral element method combining with high-pass filtered Large Eddy Simulation (LES) model has been proposed to simulate the turbulent flow through parallel wall channel and square channel with a cylindrical rod for single-phase flow.