[I56-62] デブリ取出し技術及びシステム開発

[I57] レーザー光を用いた福島燃料デブリ取出し技術に関する研究開発

（7）レーザー溶断時の温度過渡特性の評価

^〇グェン フィ ロン¹, 武部俊彦¹, 羽成敏秀¹, 山田知典¹, 村松壽晴¹ (1.日本JAEA)

キーワード：Fiber laser cutting, Thick section steel, Molten metal temperature, Thermography

Laser cutting of thick-section stainless steel using assist gas is one of the major applications of high power lasers in the decommissioning of nuclear power plants.  It is required that a control system could perform remote cutting using a fiber laser. The molten metal temperature is a key factor which directly affects the cutting quality. In this work, we have investigated the transient temperature characteristics of molten metal relating to the cutting performance. In addition, the relationship between temperature of top surface and inside material was determined by using thermography and embedded thermocouple.