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若井田 育夫; 大場 弘則; 中西 隆造; 赤岡 克昭; 柴田 卓弥
no journal, ,
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.
Batsaikhan, M.; 狩野 貴宏; 柴田 卓弥; 赤岡 克昭; 若井田 育夫
no journal, ,
Severe accident at Fukushima Daiichi Nuclear Power Station (1F) of Tokyo Electric Power Company Holdings (TEPCO) occurred after strong earthquake and massive tsunami. Since after the accident, many efforts to decommissioning of the 1F moving forward steadily and safely. It is important to realize a measurement technique that can distinguish fuel debris from other materials. In the present study, we focused on Laser Induced Breakdown Spectroscopy (LIBS) which is considered as a promising remote, in-situ and radiation tolerance technique for fuel debris inspection of the 1F. Although the LIBS is a point measurement technique, it has been used as elemental surface mapping technique in many fields, because it allows user to realize fast spatial scanning without any sample preparation. In this presentation, measurement result of 2D elemental mapping by LIBS on simulated fuel debris sample under atmospheric pressure and without radiation environment will be discussed.