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The paper presents the results of the energetic event triggered in FARO test L-33, which was the last test of the FARO series dedicated to large-scale experimental investigation of FCI in light water reactors.

In FARO L-33. 100 kg of UO(2)-ZrO(2) corium at 3000 K were released via a 50mm orifice to a pool of sub-cooled water 1.6 m in height and 0.71 m in diameter at 0.4 MPa system pressure. A self-sustained propagating event triggered by an explosive charge occurred when the melt leading edge reached the pool bottom and about 22kg of melt had entered the water. The maximum pressure measured at the inner vessel wall located at a radial distance of 350 mm form the centre of the test section was 10 MPa. The maximum impulse was 20kPa.s and the mechanical energy release about 110 kJ (i.e., two orders of magnitude higher than the trigger energy), giving a maximum efficiency of the order of 0.2 %.

The energetic event caused the inner test vessel to deform plastically and lift inside the housing pressure vessel FAT, which moved 2.5 mm upward and downward but was not damaged. After the event, the rest of the melt discharged undisturbed into the water and quenched as in the previous FARO tests. ts.

Additional information

Authors: MAGALLON D, JRC-Institute for Advanced Materials, Nuclear Safety Unit, Petten (NL);HUHTINIEMI I, EC-Institute for Systems, Informatics and Safety, 21020 Ispra, (IT)
Bibliographic Reference: An oral report given at: CONE 9 Conference. Organised by: ASME, SFEN, JSME. Held in: Nice (FR), 8-12 April, 2001
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