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FUMO-E: an internal fuel motion model for annular fuel. [LMFBR]
Farrel J. Martin, D.E. Smith
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Abstract
The FUMO-E internal fuel motion model for annular fuel was developed to assess the viability of internal fuel motion as an inherent safety shutdown mechanism during the initiation phase of hypothetical LMFBR accidents. This concept involves the ejection of molten fuel through the central hole away from the active fuel core region during a transient overpower event to provide a prompt negative reactivity feedback. The principal role of the FUMO-E model is to quantitatively assess the driving force for fuel ejection by transient fission-gas release, fuel density changes, and fuel-vapor pressure, and also to determine the effect of fuel refreezing and plugging in the central hole on limiting the fuel ejection. After completion of the assessment and of a validation process, the FUMO-E model will be incorporated into the MELT-III whole-core accident analysis code to perform the assessment of the internal fuel motion concept as a viable safety shutdown mechanism.