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Effect of Spacer Grids on the Local Heat Transfer
2010 14th International Heat Transfer Conference, Volume 4, 2010 The paper presents the experimental data of the local heat transfer in the fuel rod assembly with honeycomb type spacer grids. It was established experimentally that the separation of the boundary layer behind the spacer grid increases the interchannel coefficient of transverse mixing of flow, and therefore, the local heat transfer.
Benediktas Cesna, Eugenijus Uspuras
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Experimental Turbulence Analysis of Fuel Bundle With Spacer Grids
18th International Conference on Nuclear Engineering: Volume 2, 2010 Rod bundles are widely used in industry today with applications ranging from nuclear reactors, heat exchangers, and steam generators. Accurately modeling the inherently unsteady and turbulent flow within these rods is essential in order to design for optimal efficiency while controlling vibration, noise and heat transfer.
Elvis Dominguez-Ontiveros +2 more
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Nonlinear vibrations of a nuclear fuel rod supported by spacer grids
Nuclear Engineering and Design, 2020 Abstract The internal components of Pressurized Water Reactors (PWRs), particularly nuclear fuel assemblies, must be able to withstand Flow Induced Vibrations (FIVs) during operating conditions and during extreme accident conditions, such as earthquakes.
Giovanni Ferrari +6 more
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The Research on Scale of Cluster Fuel Assembly Spacer Grids
18th International Conference on Nuclear Engineering: Volume 2, 2010 The existence of boundary walls will impact flow and heat transfer to some extent. The boundary walls decrease the lateral velocities and change the flow direction to form some eddies, so the flow instability increases. Besides, they stop the mass transfer between the inner areas and outside.
Jie Chen, Bingde Chen, Hong Zhang
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CFD Application to Advanced Design for High Efficiency Spacer Grid
Nuclear Engineering and Design, 2014Abstract Pressurized water reactor (PWR) fuels have been developed to meet the needs of the market. A spacer grid is a key component to improve thermal hydraulic performance of a PWR fuel assembly. Mixing structures (vanes) of a spacer grid promote coolant mixing and enhance heat removal from fuel rods.
Kazuo Ikeda
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Optimization of the Atucha-II fuel assembly spacer grids
, 2012 The presentation is entitled optimisation of the Atucha-II fuel assembly spacer grids. This work deals with a demonstrative application of Computational Fluid Dynamics (CFD) for design optimisation .A commercial CFD code was applied to simulate the flow within Atucha-II reactor coolant channels and to assess the resulting pressure losses.
Melideo, D. +4 more
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Mathematical Models of Spacer Grids
Volume 3: Thermal-Hydraulics, 2016The fuel rods in Pressurized Water Reactor (PWR) and Boiling Water Reactor (BWR) cores are supported by spacer grids. Even though spacer grids add to the pressure loss in the reactor core, spacer grids have several benefits in Light Water Reactors (LWRs).
Alan B. Maskal, Fatih Aydogan
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Volume 2: Structural Integrity; Safety and Security; Advanced Applications of Nuclear Technology; Balance of Plant for Nuclear Applications, 2009
A spacer grid is one of the most important structural components in a LWR fuel assembly. The spacer grid, which supports nuclear fuel rods laterally and vertically with a friction grip, is an interconnected array of slotted grid straps welded at the intersections to form an egg-crate structure.
Kee-nam Song +4 more
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A spacer grid is one of the most important structural components in a LWR fuel assembly. The spacer grid, which supports nuclear fuel rods laterally and vertically with a friction grip, is an interconnected array of slotted grid straps welded at the intersections to form an egg-crate structure.
Kee-nam Song +4 more
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Design of a Spacer Grid Using Axiomatic Design
10th International Conference on Nuclear Engineering, Volume 1, 2002Recently, much attention has been focused on the design of the fuel assemblies in the Pressurized Light Water Reactor (PLWR). The spacer grid is one of the main structural components in a fuel assembly. It supports fuel rods, guides cooling water, and maintains geometry from the external impact loads. In this research, a new shape of the spacer grid is
K. N. Song +4 more
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