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Mathematical spacer grid models for two phase flow
Annals of Nuclear Energy, 2017Abstract The fuel rods of nuclear power plants covering 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 LWRs.
Alan B. Maskal, Fatih Aydogan
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Turbulent Flow Through Spacer Grids in Rod Bundles
Journal of Fluids Engineering, 1998The effects of the spacer grids with mixing vanes in rod bundles on the turbulent structure were investigated experimentally. The detailed hydraulic characteristics in subchannels of a 5 × 5 rod bundle with mixing spacer grids were measured upstream and downstream of the spacer grid by using a one component LDV (Laser Doppler Velocimetry).
Sun Kyu Yang, Moon Ki Chung
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Effect of spacer grids on CHF in nuclear rod bundles
Nuclear Engineering and Design, 2013Abstract In nuclear reactor fuel assemblies, spacer grids are used in the rod bundles to provide mechanical support to the rods and to reduce flow-induced vibration. These are known to play a role in the local heat transfer as well as in the onset of the critical heat flux (CHF) condition.
S. Jayanti, K. Rajesh Reddy
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Reduced-resolution RANS approach to grid spacer fuel assemblies
Nuclear Engineering and Design, 2020Abstract One of the main issues in the context of the safety assessment of liquid metal-cooled reactors is flow blockages in fuel sub-assemblies. CFD modelling may be used to predict the temperature and velocity fields inside a fuel assembly under blocked and unblocked conditions.
Akshat Mathur +2 more
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Effect of a Dimple Location in a Spacer Grid on the Impact Strength
Volume 4: Structural Integrity; Next Generation Systems; Safety and Security; Low Level Waste Management and Decommissioning; Near Term Deployment: Plant Designs, Licensing, Construction, Workforce and Public Acceptance, 2008A spacer grid is one of the most important structural components in a PWR 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, Soo-Bum Lee
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Application of the Improved Spacer Grid Model in Subchannel Analysis Code
Nuclear Technology, 2018AbstractIn most subchannel analysis codes, spacer grids are simulated using an effective loss coefficient that can account only for the spacer grid’s mean axial effect on the pressure drop. Since the mixing vane spacer grid (MVG) in a rod bundle has great influence on local flow fields, neglecting the effect of mixing vanes will degrade fidelity and ...
Siying Dong +3 more
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POST CHF EFFECTS OF SPACER GRIDS AND
Multiphase Science and Technology, 1993L. E. Hochreiter +4 more
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METHODOLOGY OF SPACER GRIDS RESISTANCE CALCULATION
Proceeding of Advances in Heat Transfer Engineering, 2023openaire +1 more source
Critical thermal load in bunches with spacer grids
Soviet Atomic Energy, 1965A. S. Kon'kov, Yu. D. Barulin
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