## 4 Conclusions  
Thus, computer simulation of the induction heating of the cerium components in the melt trap showed that the power of the inductor can be sufficient to directly obtain a melt and, subsequently, maintain the cerium in the liquid phase. Based on the performed calculations, the conditions for the physical modeling of the cerium production in the MR's melt trap of the Lava-B experimental facility were also determined.  
The results of a physical experiment to study the possibility of forming a cerium pool by induction heating in the melt trap of the Lava-B facility showed that its metal components became liquid and formed a melt pool during induction heating of the burden in the trap. These processes were confirmed both by analysis of the diagram of temperature changes in the experiment and by visual means. However, not all components forming the cerium in the concrete trap were completely melted. This can be explained by heat losses due to radiation into the MR medium, as well as thermal interactions with the trap walls, which are much colder than the melt. A high temperature gradient between the walls of the trap and the cerium leads to thermal stresses that destroy the trap. The melt escapes through the cracks outside the trap in the MR. In this regard, it can be concluded that the proposed method for obtaining cerium without making additional design decisions is not applicable in the case of using this design of the trap.  
Nevertheless, based on the analysis of both the computational and experimental study, it can be concluded that the proposed method for producing cerium is potentially feasible. However, at this stage, there are problems associated with the complete melting of all the components of the cerium, as well as with the integrity of the experimental device during the formation of the cerium pool and during the direct simulation of the physical and chemical processes of a severe accident.  
Figure 9: Removal of the second layer of the burden fragments. (**a**) Material in the traps after the mechanical removal of the remains of the zirconium rods; (**b**) The material removed at the second stage.  
Concluding the results of the studies of the corium producing method and its retention in the MR's melt trap of the Lava-B facility, the following proposals for its implementation can be presented:  
1. Apply measures to reduce heat loss by radiation from the surface of the burden/corium in the experimental device;
2. Increase the volume of the liquid phase of the corium, and conduct additional studies with varying the configuration of loading materials and the power diagram of the induction heater. The results of these studies will contribute to a gentler formation of the liquid phase of the burden metal components without its overheating and subsequent dissolution of the \"dispersed component\" of the burden;
3. Strengthen the design of the experimental device in order to increase its structural resistance to high thermal stresses, and, as a result, maintain integrity in the course of the experimental studies.  
Methodology, M.B.; software, K.T.; validation, A.A.; investigation, I.K. and M.B.; resources, M.B.; supervision, M.S., V.B., A.G. and O.S.; project administration, M.B. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Ministry of Energy of the Republic of Kazakhstan, BR09158470.  
Approved by the ethics committee of the Institute of Atomic Energy.  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
The data used to support the funding of this study are available from the corresponding author upon request.  
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.