During severe accidents at Nuclear Power Plants (NPPs), fuel-coolant interaction (FCI) is a critical event in which the melt released from the core region comes into contact with the coolant. The melt may eject in the form of a melt jet and threaten the integrity of the NPP. | Progress in Nuclear Energy 108 2018 188 203 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage locate pnucene Review Melt jet-breakup and fragmentation phenomena in nuclear reactors A T review of experimental works and solidification effects Yuzuru Iwasawaa Yutaka Abeb a Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan b Faculty of Engineering Information and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan A R T I C LE I N FO A B S T R A C T Keywords During severe accidents at Nuclear Power Plants NPPs fuel-coolant interaction FCI is a critical event in which Nuclear reactor the melt released from the core region comes into contact with the coolant. The melt may eject in the form of a Severe accident melt jet and threaten the integrity of the NPP. Therefore fragmentation of the melt jet and quenching of par- Fuel-coolant interaction ticulate fragments from the melt jet are invaluable from the viewpoint of safety assessment. To assess the in- Jet-breakup tegrity of an NPP melt fragmentation phenomena that affects quenching and sustainable cooling of the debris Fragmentation bed are important factors that must be predicted and evaluated precisely. The present review summarizes ex- Solidification effects perimental works on the FCI phenomenon especially fragmentation of a melt jet during a severe accident in an NPP. In addition special attention is paid to solidification effects. Based on the literature survey we discussed the dominant factors governing the fragmentation mechanisms. Furthermore we discuss the applicability of various models for estimating these phenomena. 1. Introduction Matsuo et al. 2008 Iwasawa et al. 2015a Li et al. 2017 is important. In addition fine fragmentation of a melt jet may lead to vapor explo- For stabilization and termination of a severe accident in a Nuclear sion which threaten the integrity
