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Pre-calculation of the Middle-Scale In-Pile Test in the EAGLE Project; 3-D Evaluation using the SIMMER-IV code

Toyooka, Junichi  

In the in-pile part of this project, establishment of the test technique has been conducted along with the progress of the test program leading to the final step tests. Before the final step tests(three tests) with about 8kg of fuel melt formation, a middle-scale test (WF test) with about 2kg of fuel melt has been planned.The WF test aims at confirmation of techniques to form fuel melt with a scale of 1/4 that of the final step ones, to collect measurement data and acquisition of basic data related to initiation of the melt discharge from the core.In order to confirm appropriateness of the selected test condition on one hand, and to provide useful information for preliminary interpretation of the test results on the other hand, predictive evaluation using an analytical tool has been conducted. Through this study, following points were confirmed:- Through SIMMER-IV-code application representing appropriately the complicated three-dimensional test-section geometry, it was concluded that the selected test conditions were appropriate.- Through this study reflecting the knowledge obtained from the small-scale tests of the EAGLE project, it was concluded that the rather early steel melting and resultant steel segregation from fuel, which had been regarded as a possible concern, would be avoided.- Present study suggested that SS wall cooled by sodium from its behind could be strongly cooled by oscillatory movement of sodium leading to significantly delayed wall failure.- Test data such as failure time and location of both the SS wall facing the sodium channel and the adiabatic SS wall with heat transfer from the molten fuel pool, and cover gas pressure, it is expected that one can get useful knowledge on heat transfer within the pool and wall failure mechanism.

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