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Report No.
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Mechanism of upward fuel discharge during core disruptive accident in sodium-cooled fast reactors

Matsuba, Kenichi; Isozaki, Mikio; Kamiyama, Kenji; Tobita, Yoshiharu

The introduction of Fuel Assembly with Inner Duct Structure (FAIDUS) is being considered to prevent the formation of a large-scale molten fuel pool within a reactor core, which is one of factors leading to the severe power excursion during CDA of SFRs. In the current reference design for FAIDUS, the top end of the inner duct is open whereas the bottom end is closed. In order to clarify the fundamental mechanism for upward fuel discharge through the inner duct, JAEA conducted an out-of-pile experiment in which a high-density melt simulating the molten fuel was injected into a simulated inner duct. In this paper, the mechanism of upward discharge observed in this experiment is discussed in terms of the application to reactor conditions. It was suggested that the coolant pressure buildup could act as one of the driving force for the upward discharge under reactor conditions with higher melt-enthalpy-injection rate than the current simulant experimental condition.

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Category:Engineering, Mechanical

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