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Report No.

Preparation for trial use of optical fiber based portable LIBS system at actual working site in decommissioning of Fukushima Daiichi Nuclear Power Station

Wakaida, Ikuo ; Oba, Hironori; Nakanishi, Ryuzo; Akaoka, Katsuaki ; Shibata, Takuya 

The decommissioning of the Fukushima Daiichi Nuclear Power Station (1FNPS), which had melt downed core, it will be required a rapid, remote and in-situ screening analysis of fuel debris and a large amount of waste materials in a narrow and extremely high radiation environment. Radiation resistant Optical Fiber based LIBS is one of the practical technique as the remote in-situ analysis, and basic performances of remote operability and radiation resistance has been demonstrated. As a result, over 50m Laser delivery and radiation resistance of a few MGy under at a dose rate of 10kGy/h, has been shown. And especially, it has demonstrated that the calibration curve will be not changed even under the radiative environment of 10 kGy/h. The challenging plan to install a LIBS system as a trial use in an actual work environment where air contamination is undeniable and to challenge the remote analysis of radioactive samples is approved. A simple pollution prevention unit to protect the previously developed portable LIBS system from the contaminated environment and remote controlled XYZ sample stage for LIBS probe combined with a ventilation system will be prepared and tested at actual working site in 1FNPS.



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