Challenging and development on radiation hardend laser remote analysis for in-situ screening of nuclear fuel debris in decommissioning of Fukushima Daiichi Nuclear Power Station

Wakaida, Ikuo  ; Oba, Hironori  ; Akaoka, Katsuaki ; Karino, Takahiro ; Nakanishi, Ryuzo*; Sakamoto, Kan*; Ikeda, Yuji*; Taira, Takunori*

The decommissioning of the "Fukushima Daiichi Nuclear Power Station", quickly and easy sorting a Nuclear Fuel rich material from a large amount of Radioactive Waste materials is extremely important for or the safety retrieval of Nuclear Fuel Debris and more for the reliable management of nuclear material. With the concept of "Probing by light" and "Diagnostic by light", Laser Induced Breakdown Spectroscopy (LIBS) by use a radiation resistant optical fiber will be one of the choices as the innovative developed rapid, easy, onsite and in-situ remote diagnostic/analysis techniques under extremely high radiation. The radiation-resistant optical fiber based LIBS will be developed, and a basic performances of over 50m long Laser delivery, radiation resistance of a few MGy under a dose rate of 10 kGy/h, and No-influence on the analytical performance under up to 10 kGy/h has been demonstrated. In this presentation, ultra-long-distance remote analysis by microchip laser based optical fiber LIBS, remote analysis of actual spent fuel under high radiation condition in Hot-Cell Facility, and the other challenges will be also discussed.