Development of a Radiological Characterization Submersible ROV for Use at Fukushima Daiichi
Development of a Radiological Characterization Submersible ROV for Use at Fukushima Daiichi
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DOI：
10.1109/tns.2018.2858563
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发表时间：
2018-09-01
影响因子：
1.8
通讯作者：
Nishimura, K.
中科院分区：
文献类型：
--
作者：
Nancekievill, M.;Jones, A. R.;Nishimura, K.
为了在 2011 年海啸事故后使福岛核电站退役，需要对燃料碎片进行表征。目前燃料碎片的精确位置和放射性成分尚不清楚，并且该区域被淹没，因此很难调查主安全壳。包括辐射探测器和声纳的集成系统将能够对燃料碎片进行全面定位和表征。本文描述了为开发一个完整的系统而完成的研究，该系统安装在低成本、小型、潜水式遥控潜水器上。用于剂量率监测和伽马射线光谱测定的溴化铈 (CeBr3) 闪烁体探测器已在实验室和水下与 Cs-137 源进行集成和实验验证。 Imagenex 831L 声纳的加入使得日本国家海事研究所的设施能够进行技术演示，该系统能够表征合成芯碎片的形状和大小。几何和放射学测量的结合可以实现燃料碎片的实时定位和同位素识别，为福岛的工作人员提供宝贵的信息来源，从而提高效率并降低现场退役期间的风险。
To decommission the Fukushima nuclear power plant after the accident caused by a tsunami in 2011, characterization of the fuel debris is required. The precise location and radiological composition of the fuel debris are currently unknown, and the area is submerged making it difficult to investigate the primary containment vessel. An integrated system that includes both radiation detectors and sonar will allow the full localization and characterization of the fuel debris. This paper describes research completed toward the development of a complete system, on-board a low-cost, small form-factor, submersible remotely operated vehicle. A cerium bromide (CeBr3) scintillator detector for dose-rate monitoring and gamma-ray spectrometry has been integrated and validated experimentally with a Cs-137 source, both in the laboratory and while submerged. The addition of an Imagenex 831L sonar has enabled technical demonstrations to take place at the National Maritime Research Institute's facility in Japan, where the system was able to characterize the shape and size of synthetic core debris. The combination of geometrical and radiological measurements allows the real-time localization of fuel debris and isotope identification, leading to an invaluable source of information to the workers at Fukushima that will enable increased efficiency and reduce risk during the decommissioning of the site.