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Morita, Koji*; Ogawa, Ryusei*; Tokioka, Hiromi*; Liu, X.*; Liu, W.*; Kamiyama, Kenji
Proceedings of 12th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation and Safety (NUTHOS-12) (USB Flash Drive), 11 Pages, 2018/10
The EAGLE in-pile ID1 test has been performed by Japan Atomic Energy Agency to demonstrate early fuel discharge from a fuel subassembly with an inner duct structure, which is named FAIDUS. It was deduced that early duct wall failure observed in the test was initiated by high heat flux from the molten pool of fuel and steel mixture. The posttest analyses suggest that molten pool-to-duct wall heat transfer might be enhanced effectively by the molten steel with large thermal conductivity in the pool without the presence of fuel crust on the duct wall. In this study, mechanisms of heat transfer from the molten pool to the duct wall was analyzed using a fully Lagrangian approach based on the finite volume particle method for multi-component, multi-phase flows. A series of pin disruption, molten pool formation and duct wall failure behaviors was simulated to investigate mixing and separation behavior of molten steel and fuel in the pool, and their effect on molten pool-to-duct wall heat transfer. The present 2D particle-based simulations demonstrated that large thermal load beyond 10 MW/m on the duct wall was caused by effective heat transfer due to direct contact of liquid fuel with nuclear heat to the duct wall.
Yamauchi, Toshiya*; Ogawa, Ryusei*; Kato, Masatsugu*; Liu, X.*; Matsumoto, Tatsuya*; Morita, Koji*; Kamiyama, Kenji; Suzuki, Toru
no journal, ,
no abstracts in English
Ogawa, Ryusei*; Yamauchi, Toshiya*; Kato, Masatsugu*; Liu, X.*; Matsumoto, Tatsuya*; Morita, Koji*; Kamiyama, Kenji; Suzuki, Toru
no journal, ,
no abstracts in English
Kato, Masatsugu*; Ogawa, Ryusei*; Funakoshi, Kanji*; Liu, X.*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Kamiyama, Kenji
no journal, ,
no abstracts in English
Morita, Koji*; Ogawa, Ryusei*; Liu, X.*; Liu, W.*; Kamiyama, Kenji
no journal, ,
Based on simulation results which addressed a series of behavior from fuel pin disruption to heat-transfer between molten pool and duct wall observed in ID1 test in the EAGLE program, a physical mechanism of high heat-flux from molten pool to duct wall, which is estimated as a factor of duct wall failure, was investigated.