SADD - Severe accident database directory

DataBase Ex-Vessel - Focus area 1: Ex-vessel fuel coolant interaction (EVFCI) (1)

Facility Name	Test Identification	Measured Parameters	Modelling	Simulation Code	Experimental Research Program	Country
DEFOR-A	A23 - 27	Debris bed 3D scanning, agglomeration fraction as pool depth function, particle size distribution as pool depth function, debris bed porosity estimate	Melt jet breakup	JBREAK; CLSVOF; COCOMO	(i) Experimental program "Invstigation of Cooling Phenomena of High Temperature Molten Core" for Nuclear regulation Authority (NRA) of Japan; (ii) EU SAFEST; National program "Accident Phenomena of Risk Importance" (APRI) supported by consortium of SSM an
References: [1] Wataru Kikuchi, Akitoshi Hotta, Koetsu Ito, Mamoru Shimizu, Development of an evaluation method for debris bed formation behavior focusing on the agglomeration mechanism observed in the DEFOR-A test using THERMOS/JBREAK–DPCOOL–MSPREAD, Nuclear Engineering and Design, Volume 439, 2025, 114041, https://doi.org/10.1016/j.nucengdes.2025.114041 [2] Akitoshi Hotta, Miyuki Akiba, Akinobu Morita, Alexander Konovalenko, Walter Villanueva, Sevostian Bechta, Andrei Komlev, Sachin Thakre, Seyed Mohsen Hoseyni, Per Sköld, Toshinori Matsumoto, Tomoyuki Sugiyama & Michael Buck, “Experimental and Analytical Investigation of Formation and Cooling Phenomena in High Temperature Debris Bed”, Journal of Nuclear Science and Technology, 57:4, 353-369, 2019, DOI: 10.1080/00223131.2019.1691078 IP/Copyright Situation: None Link to PIRT:

Oxidic simulant melt fragmentation and debris bed formation in deep water pool