EVALUATION OF AIRBORNE RELEASE BEHAVIOURS DURING CUTTING FUEL DEBRIS FOR FUTURE SAFETY ASSESSMENT OF FUEL DEBRIS RETRIEVAL

-DUST DISPERSION DURING CUTTING WITH DISK CUTTER-

Abstract

Disc cutter is a representative cutting tool for debris retrieval. For the cutting experiment using a disc cutter, size of the disc blades, rotational speed of the disc, and pressing force is changed as a test parameter. Experimental data showed that dust generation by disc cutting is affected by the physical properties of the object. Therefore, in order to organize the dust dispersion characteristics in terms of the mechanical properties of the object, experiments were conducted using cold simulants with various physical properties (Al₂O₃, Zircon, Mortal, SS₄₀₀, and SUS₃₀₄). Furthermore, simulant debris containing UO₂ was manufactured and cutting experiments were also conducted using this simulant. Both Al₂O₃ and simulant debris containing UO₂, it was found that the porosity affects air bone dust characteristics such as ARF and particle size distribution.