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概要

As a part of the research and development of a monitoring system for NPPs situations during a severe accident, a radiation-resistant in-water wireless transmission system has been developed from fiscal 2012. From a consideration about the properties of in-water transmission methods, visible light was adopted as the transmission method of the system. From the results of gamma irradiation tests for optical devices, a 2-dimensional LED matrix and a camera were used as the light emitting and receiving devices, respectively. Interleaving, high-speed scanning and variable digitalization functions were implemented so as to enhance the system robustness for change of in-water environment. The results of the transmission tests using an in-water environment simulator suggested that stable wireless transmission between 5 m distance was possible even with bubble, turbidity, or obstacles. In addition, the results of the irradiation tests of the candidate components indicated possibility of 1MGy radiation resistance of the system.

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