2023年5月21-26日

原子力国際専攻岡本研究室 徐 锐聪さん （D２） が、「第30回原子力工学国際会議（ICONE30）」においてBest Paper Awardを受賞されました。

〈Name of award and short explanation about the award〉

Best Paper Award

The 30th International Conference on Nuclear Engineering (ICONE30) held in Kyoto, Japan on May 21-26, 2023, presented the “Best Paper Award” to the researches for their outstanding and high-quality papers submitted to the track of student paper competition in ICONE30.

〈About awarded research〉

During the surface cleaning or cutting processes for retrieval of resolidified debris in Fukushima Daiichi decommissioning, aerosol particles in submicron scale, which are difficult to be removed effectively by traditional spraying methods, are expected to be generated. Through a series experimental studies using single-hole nozzle spray, an aerosol agglomeration method was recently confirmed to be useful for enlarging the sizes of aerosol particle, thereby improving the aerosol spray scavenging efficiency. However, in the actual Fukushima Daiichi decommissioning, due to the larger scale of containment, spray system with multiple nozzles or outlets will likely to be utilized, and its aerosol scavenging characteristics need to be examined. Therefore, this study performs experiments using a multi-hole (7 holes) nozzle with the injection of water mist to investigate the aerosol removal efficiency along with the spray characteristics. It is found that because of the different spray droplet characteristics (droplet velocity, size, etc.), the aerosol scavenging efficiency under a multi-hole nozzle spraying system is lower than the single-hole nozzle ones. The present results suggest that there exists optimal combination of droplet size, discharge velocity, spraying space, and mist concentration to achieve the effective aerosol removal for the given system under a fixed consumption of water. The results obtained from the present study will be helpful for the optimization of spray system design for effective aerosol scavenging during Fukushima Daiichi decommissioning.

〈Your impression & future plan〉

It is my pleasure and honor to win this award in strong competition with other outstanding students from all over the world. I would like to express my gratitude to my supervisors Prof. Miwa, Prof. Okamoto, and Prof. Suzuki, who provides me with very important guidance, support, and encouragement during my research. I also appreciate Dr. Sharma and Dr. Ozdemir for their help and effort in this study. I also thank Prof. Pellegrini and the other members of the Visualization Laboratory for their valuable suggestions during daily communications and meetings. I would like to appreciate the good organization of ICONE30, which impressed me and give me lots of unforgettable memories. In the future, I will continue my research on effective aerosol spray scavenging for Fukushima Daiichi decommissioning with great passion.