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Development of assessment method to evaluate the material relocation behavior in the core disruptive accident of FBR, 2; Measurement and evaluation of the distance for fragmentation of molten core simulant in liquid-liquid direct contact

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

In order to develop an evaluation method of the distance for fragmentation (debris formation) of molten core material discharged into the lower sodium plenum during core disruptive accidents in sodium-cooled fast reactors, a fundamental experiment was carried out, in which molten alloy (melt) and water were employed to simulate liquid-liquid direct between molten core material and sodium. Experimental results show that measured distances for fragmentation of melt column tended to increase with the increase of discharge diameter. However, the measured distances were approximately 10% lower than predictions by the existing representative correlation. Based on the results of this fundamental experiment, it was understood that the distance for fragmentation can be significantly reduced in conditions where liquid-liquid direct is established and thus vapor formation occurs intensively.

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