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- W2300311803 abstract "Three dimensional (3D) finite element analysis (FEA) allows the mechanical integrity of complex structuresto be estimated with some confidence. This research is concerned with extending an existing parallelFEA code. This code has been run on up to 16 processors on Durham University’s high performance computing(HPC) cluster and two different parallel linear solvers have been compared. A key feature of thework has been to develop tools for structural analyses. An automatic mesh refinement program has beenwritten, the Zienkiewicz and Zhu error estimator has been coded for 3D hexahedral meshes and postprocessing techniques have been used to calculate and visualise principal stress data and peak stresscriteria. This project also reports on three peak stress envelopes used to assess the condition of a concretesub-structure. The development of this parallel code has enabled the deformation behaviour of a key component ofa nuclear rector vessel to be determined. The BCU is a prestressed cylindrical concrete vessel (depthof 1.73m and diameter of 3.37m) sealing the top of a boilers housed within the walls of the reactor. Inrecent years possible problems have been identified at the Hartlepool and Heysham I Advance Gas-Coolednuclear reactors (AGR) with respect to the structural condition of the BCU (in particular the conditionof the prestressed circumferential wires designed to maintain the BCU in a state of compression). Thisproblem provides an interesting case study for this project. Four different BCU meshes have been usedcontaining either 40201 or 321608 elements (the elements are either 8 or 20-noded hexahedral elements).Three different load cases have been used to model the BCU. The results of the analyses confirm that thecircumferential pre-stressing is vital in order to keep the BCU is a state of compression and operatingunder safe working conditions. These results have been confirmed using principal stress plots and threedifferent peak stress envelopes. The results show that when the pre-stressing is released approximatelyone quarter of the elements contain stresses at Gauss points which exceed the peak strength of theconcrete. This suggests that under these extreme conditions the BCU’s structural integrity has beenseverely compromised, concrete rupture is possible and the nuclear reactor is no-longer safe to operate." @default.
- W2300311803 created "2016-06-24" @default.
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- W2300311803 date "2012-01-01" @default.
- W2300311803 modified "2023-09-27" @default.
- W2300311803 title "Analysis of a Nuclear Reactor Boilure Closure Unit Through Development of a 3D Parallel Finite Element Code" @default.
- W2300311803 hasPublicationYear "2012" @default.
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