[1C13-18] Analytical Technique for Fuel Debris

[1C13] Development of Quick and Remote Analysis for Severe Accident Reactor-9

(1) Current results and challenges in development of Laser In-situ remote analysis for nuclear fuel debris in decommissioning of Fukushima Daiichi Nuclear Power Station-2

*Ikuo Wakaida¹, Hironori Ohba¹, Katsuaki Akaoka¹, Takahiro Karino¹, Kan Sakamoto², Ryuzo Nakanishi³, Shunsuke Kashiwakura⁴, Takunori Taira⁵, Yuji Ikeda⁶, Yoshihiro Deguchi⁷ (1. JAEA, 2. NFD, 3. STQ, 4. Ritsumeikan Univ., 5. IMS, 6. i-Lab. Inc., 7. SL&PS Co.)

Keywords:LIBS, Microchip lase, Microwave assisted LIBS, Long/short double pulse laser LIBS, In-situ remote analysis , Spent fuel, Machin learning analysis, Fukushima Daiichi Nuclear Power Station

We are developing remote in-situ analysis by laser induced breakdown spectroscopy (LIBS) for simple in-situ screening analysis of fuel debris in the decommissioning of the Fukushima Daiichi Nuclear Power Station. For various application scenarios, microchip laser based LIBS for ultra-long distance analysis, microwave assisted LIBS for signal enhancement, and long/short double pulse laser LIBS for water-containing samples are developing as the fiber-optic LIBS system. To have the reliability, valuation with nuclear fuel materials and spent fuel, and radiation resistance test by 60Co irradiation will be planed. As a challenging trial, a development of Machine learning technique has introduced for automatically analysis of LIBS spectra.