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Abstract

A comparative experimental study on quenching in sodium of four molten fuel materials - UO-2, A1-2O-3, Cu and stainless steel - is presented. Experimental results like temperatures, pressures, particle shapes, particle size distributions, crack patterns and crystal grain sizes are given and interpreted. These fuel coolant interactions can be understood as all being characterized by transition boiling of sodium. The fuel is first fragmented by the sodium vapour bubble growth and collapse process. These particulates have smooth surfaces. The two materials, UO-2 and A1-2O-3, are fragmented further by a delayed mechanism which is thermal stress shrinkage cracking. Delayed particles are fragments of larger ones. Furthermore, attention is drawn to the theoretical results which show that pure FCI particulate is significantly finer.

Additional information

Authors: SCHINS H JRC ISPRA, JRC ISPRA
Bibliographic Reference: 5TH INFORMATION EXCHANGE MEETING ON DEBRIS COOLABILITY, LOS ANGELES (USA), NOV. 7-9, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31740 ORA
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