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Design of a Spacer Grid Using Axiomatic Design
Journal of Nuclear Science and Technology, 2003Recently, much attention is focused on the design of fuel assemblies in the Pressurized Light Water Reactor (PWR). 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 external impact loads.
Ki-Jong PARK +3 more
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Vibration of the Package of Rods Linked by Spacer Grids
2011This paper deals with modelling and vibration analysis of the large package of identical parallel rods which are linked by transverse springs (spacer grids) placed on several level spacings. The vibration of rods is caused by the support plate motion. The rod discretization by FEM is based on Rayleigh beam theory.
V. Zeman, Z. Hlaváč
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Study on the Lateral Velocity and Vortex in a Spacer Grid
Nuclear Technology, 2018AbstractThe spacer grid is one of the most important parts of a fuel assembly for enhancing thermal-hydraulic performance. The mixing vane is a critical component of the spacer grid (or mixing vane grid) to produce lateral flow, turbulence, vortex, and other mixing mechanisms downstream of the grid.
Bin Han +3 more
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Numerical study on the effect of grid mixing span in 2 × 1 spacer grid
Nuclear Engineering and Design, 2018Abstract Spacer grid or Mixing Vane Grid (MVG) is recognized as an important component that could greatly improve Critical Heat Flux (CHF) performance in the fuel assembly. The temperature around the rod would be more uniform, bubbles around the rod wall would be broken off or driven to the center of the subchannel by the mixing effects produced by ...
Bin Han, Bao-Wen Yang, Yudong Zha
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Impact Analysis and Test on the Spacer Grid Assembly for PWRs
Key Engineering Materials, 2005A spacer grid assembly is one of the main structural components of the fuel assemblies of Pressurized light Water Reactors. The spacer grid assembly is structurally required to have enough buckling strength under various kinds of lateral loads acting on the fuel assembly so as to keep the fuel assembly straight. The structural performance of the spacer
Kee Nam Song +3 more
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Local heat transfer coefficient near the spacer grids
Kerntechnik, 2011Abstract 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 ...
B. Cesna, M. Valincius
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Analysis on the Dynamic Buckling Behavior of the Spacer Grid Structure
Volume 3: Nuclear Fuel and Material, Reactor Physics, and Transport Theory, 2018The spacer grid is a key element of the fuel assembly used in the Pressurized water reactor. Due to its structural complexity, the analysis and the design of the spacer grid structure is difficult. This paper discusses the 5 × 5 cell size partial grid analysis including the detailed grid structural elements, through which, the impact force, the rebound
Yan Guo +3 more
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Spacer Grid Assembly with Sliding Fuel Rod Support
Transactions of the Korean Society of Mechanical Engineers A, 2010A spacer grid assembly is one of the most important structural components of the nuclear fuel assembly of a Pressurized Water Reactor (PWR). A primary design requirement is that the fuel rod integrity be maintained by the spacer grid assembly during the operation of the reactor.
Kee-Nam Song, Sang-Hoon Lee
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Impact Analysis and Test of the Spacer Grid Assembly for PWRs
Key Engineering Materials, 2006The spacer grid assembly, which is an interconnected array of slotted grid straps and welded at the intersections to form an egg crate structure, is one of the main structural components of the nuclear fuel assembly of a Pressurized light Water Reactor (PWR).
Kee Nam Song +3 more
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Mathematical spacer grid models for single phase flow
Annals of Nuclear Energy, 2017Abstract The fuel rods in pressurized water reactor (PWR) and boiling water reactor (BWR) cores are supported by spacer grids. Even though spacer grids add to pressure loss in the reactor core, spacer grids have several benefits in light water reactors (LWRs). Some of these benefits are: (i) increasing turbulence at the bottom of the reactor core for
Alan B. Maskal, Fatih Aydogan
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