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Report No.
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Radionuclide release from fuel under severe accident conditions

Kudo, Tamotsu 

After the TMI-2 accident, a number of experimental data on radionuclide release from fuel have been obtained in the world. However, these data were obtained under only conditions with atmospheric pressure, fuel temperature below 2900 K. And data for radionuclide release from MOX, and interactive effect of fuel oxidation and dissolution were limited. Then, the VEGA program was conducted at JAEA at pressure of 0.1 and 1.0 MPa, temperature to about 3130 K, using UO$$_{2}$$ and MOX fuels, under inert and oxidized atmosphere. The VEGA program showed that the Cs release at 1.0 MPa was smaller by about 30 % than that at atmospheric pressure, and acceleration of Cs release rate was observed above 2800 K due to foaming and melting of fuel. This article mainly describes the radionuclide release from UO$$_{2}$$ and MOX fuels, and effects of fuel oxidation and dissolution.

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