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L. R. Luttrell

Bio: L. R. Luttrell is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Deformation (meteorology) & Pipe flow. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, an experimental-analytical solution to this problem for design purposes has been developed and is presented and is used in the design of a nuclear power plant with a single-input single-output (SISO) system.
Abstract: In some reactors, thin fuel plates are cooled by water flowing through thin channels on either side of the plates. There is a need to know the amount of deformation in the fuel plates due to the coolant flow so that failures can be avoided. A verifiable solution to this problem in the past has not been available. An experimental-analytical solution to this problem for design purposes has been developed and is herein presented.

6 citations


Cited by
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TL;DR: In this article, the authors developed a fluid-structure interaction methodology to investigate numerically the onset of hydroelastic instability of flat-shell-type fuel elements under axial flow conditions.

22 citations

01 Jan 2013
TL;DR: In this article, a fully-coupled and implicit solution algorithm (COMSOL) is proposed to solve the structural interaction problem at the HF-II at the Oak Ridge National Lab.
Abstract: The High Flux Isotope Reactor at the Oak Ridge National Lab is in the research stage of con- verting its fuel from high-enriched uranium to low- enriched uranium. Due to dierent physical properties of the new fuel and changes to the internal fuel plate design, the current safety basis must be re-evaluated through rigorous computational analyses. One of the areas being explored is the uid-structure interaction phenomenon due to the interaction of thin fuel plates (50 mils thickness) and the cooling uid (water). De- tailed computational uid dynamics and uid-structure interaction simulations have only recently become fea- sible due to improved numerical algorithms and ad- vancements in computing technology. For many rea- sons including the already built-in uid-structure in- teraction module, COMSOL has been chosen for this complex problem. COMSOL's ability to solve multi- physics problems using a fully-coupled and implicit solution algorithm is crucial in obtaining a stable and accurate solution. Our initial ndings show that COM- SOL can accurately model such problems due to its ability to closely couple the uid dynamics and the structural dynamics problems.

5 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the modeling and simulation of fluid structure interactions (FSI) of involute-shaped fuel plates used in nuclear research reactors and validate the simulations against plate deflection data for the conceptual design of the Advanced Neutron Source Reactor.

2 citations

01 Feb 1996
TL;DR: In this paper, tests were conducted on reactor fuel plates intended for the Advanced Neutron Source (ANS) to determine the potential of giving different design weights to the primary and secondary stresses.
Abstract: If the load is not relieved as a structure starts to yield, the induced stress is defined as primary stress. If the load relaxes, as a structure begins yield the induced stress is defined as secondary stress. In design it is not uncommon to give more weight to primary stresses than to secondary stresses. However, knowing when this is good design practice and when it is not good design practice represents a problem. In particular, the fuel plates in operating reactors contain both primary stresses and secondary stresses and to properly assess a design there is a need to assign design weights to the stresses. Tests were conducted on reactor fuel plates intended for the Advanced Neutron Source (ANS) to determine the potential of giving different design weights to the primary and secondary stresses. The results of these tests and the conclusion that the stresses should be weighted the same are given in this paper.