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Journal ArticleDOI

Analysis of parallel channel instabilities in the CANDU supercritical water reactor

01 Sep 2015-Annals of Nuclear Energy (Pergamon)-Vol. 83, pp 264-273
TL;DR: In this article, the authors investigated the parallel channel density wave instability in the CANDU supercritical water reactor (SCWR) using a 1-D thermal-hydraulic model in the time domain.
About: This article is published in Annals of Nuclear Energy.The article was published on 2015-09-01. It has received 26 citations till now. The article focuses on the topics: Nuclear reactor core.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a thermal-hydraulic (TH) model is employed to solve the nonlinearly coupled mass, axial momentum and energy conservation equations in a time domain using characteristics based implicit finite difference scheme accounting for the compressible flow dynamics of supercritical water.
Abstract: The present study numerically investigates Density wave oscillations (DWOs), a dynamic instability and captures Heat transfer deterioration (HTD) phenomenon for a Supercritical water reactor (SCWR) of the U. S. reference design. A Thermal-hydraulic (TH) model is employed to solve the nonlinearly coupled mass, axial momentum and energy conservation equations in a time domain using characteristics based implicit finite difference scheme accounting for the compressible flow dynamics of supercritical water. The analysis of DWOs is carried out to obtain the marginal stability thresholds. Next, the steady as well as transient safety analyses are carried out to determine the occurrence of HTD, access its severity and identify the safe operating conditions. Finally, the common operating conditions are predicted where the U. S. SCWR will be stable as well as safe.

15 citations

Journal ArticleDOI
TL;DR: A 3D numerical study of turbulent flow of supercritical water flowing upward in two heated parallel channels with constant applied wall heat flux was developed using a RANS model in the Computational Fluid Dynamics (CFD) code ANSYS CFX as discussed by the authors.

14 citations

Journal ArticleDOI
Beibei Xie1, Dong Yang1, Wenyu Wang1, Xin Nie1, Wanyu Liu1 
TL;DR: In this article, a numerical computational program called Dynsys is developed in Fortran language to analyze the flow instability occurring in the water wall of an ultra-supercritical CFB boiler with annular furnace.

12 citations

Journal ArticleDOI
Jialun Liu1, Huixiong Li1, Qian Zhang1, Xiangfei Kong1, Xianliang Lei1 
TL;DR: In this article, a time-domain model is proposed to study the density wave instability of supercritical water in parallel multichannel system, and the model is verified by the experimental data obtained in open literature.

11 citations

Journal ArticleDOI
TL;DR: Given the importance of a fundamental understanding of two-phase flow instability to enhance the system performance and reliability, future research should focus on improving the instability analysis of multiphase flow systems and developing mitigation strategies for the design and operation of parallel flow systems.

11 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors identify the causes and mechanisms of thermal-hydrodynamic instabilities in boiling flow in a water-cooled reactor, an evaporator, or an electronic cooling system.

708 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed dimensionless parameters for the analysis of stability in heated channels with supercritical fluids, based on the classical phase change and sub-cooling numbers adopted in the case of boiling channels, proposing a novel formulation making use of fluid properties at the pseudocritical temperature as a function of pressure.

142 citations

Journal ArticleDOI
TL;DR: A review of the current state of the art on the topic of coupled neutronic-thermohydraulic instabilities in boiling water nuclear reactors (BWRs) can be found in this article.

142 citations

Journal ArticleDOI
TL;DR: In this article, supercritical flow stability in a single-channel, natural-convection loop is examined using a non-linear numerical code and a theoretical stability criterion is also developed to verify the numerical prediction.

118 citations

Journal ArticleDOI
TL;DR: In this paper, the stability threshold of a natural circulation loop with supercritical fluid is not confined to the near-peak region of the (steady state) flow-power curve.

110 citations