Presentation Information
[3A09]Development of Efficient Non-Contact Removal of White Sodium Compounds Using Nanosecond Pulsed Laser
*Atsushi Kosuge1, JUN-ICHI SAITO1 (1. JAEA)
Keywords:
Nanosecond Pulsed Laser,Laser Decontamination,Laser Induced Breakdown Spectroscopy,Fast Breeder Reactor,Sodium Compounds
In the decommissioning of fast reactors, including Monju, residual metallic sodium reacts with water or air, causing heat generation and corrosion. Therefore, safe and efficient removal of sodium compounds is essential. Proper removal enables the reuse of metal components, contributing to decommissioning efficiency and resource utilization. Recently, laser-based removal techniques have attracted attention, and nanosecond pulsed laser ablation, which minimizes thermal effects, is particularly promising. In this study, a 100 W MOPA-type nanosecond fiber laser with adjustable pulse width and repetition rate was irradiated onto metal samples. The samples were prepared by depositing sodium vapor on SUS304 in an argon atmosphere and exposing them to air to form white sodium compounds. Laser-induced breakdown spectroscopy revealed no residual sodium, demonstrating the effectiveness of nanosecond pulsed lasers for non-contact removal of white sodium compounds.