Scaling Analysis on In-VV LOCA for the Experimental Facility of Water-Cooled Components in CFETR

The Vacuum Vessel (VV), as the first confinement barrier of the Chinese Fusion Engineering Test Reactor (CFETR) must guarantee its integrity once the In Vacuum Vessel Loss of Coolant Accident (In-VV LOCA) happens. Enough experimental verifications are inevitable. And the data from the experimental facility should be convincing with an acceptable cost. In the present research, scaling criteria are identified for the In-VV LOCA, which can provide the direction for the design scheme of the experimental facility. The experimental facility employs the same working fluid and the equal thermal operation conditions. The volume scaling factor of 1/1000 for the VV with a toroidal structure adopted in the experimental facility is selected. The similarities of the flow at the break, flash and the flow resistance are prioritized. Through the computational simulation for the experimental facility, it has been demonstrated that the thermal hydraulic responses could be reappeared in the experimental facility within an acceptable range of distortions.