Scaling analysis for the pebble bed of the very high temperature gas-cooled reactor thermal hydraulic test facility Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h415pd154

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  • The Very High Temperature Reactor (VHTR) has two possible core configurations, a hexagonal prismatic and a pebble bed. It is essential that an experimental facility be built for the validation of computer codes for the safe operation of the VHTR. The scaling of the prismatic core configuration has been analyzed previously for a large break loss of coolant accident. This is a scaling analysis for the pebble bed core configuration. As part of the full scaling analysis, the bottom up scaling of the pebble bed core for pressure drop and radial heat transfer were conducted. Radiation is the dominant form of heat transfer at high temperatures and was scaled using the two methods of treating radiation in a packed bed of spheres. The results of scaling were compared using FLUENT, a computational fluid dynamics code, using the setup, run, and comparison of a 1/80 azimuthally and 1/4 radial full scale prototype and scaled model. The temperature profiles across the core under natural circulation like conditions were determined for both models. The model and prototype temperature profiles had significant variation at the boundary, but only a few degree variation away from the boundary. Additionally, the radiation transport equation and radiation conductivity were compared, and distortions quantified for the FLUENT models.
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