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Report No.
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Instrumentation device and surface control technology for coolant piping system of nuclear power plants

Nishimura, Akihiko  ; Terada, Takaya; Shimada, Yukihiro; Yonemoto, Yukihiro*; Yamada, Tomonori

Instrumentation devices using laser technologies were developed for maintenance of coolant piping system. For instrumentation devices, seismic monitoring by optical fiber sensors was able to detect vibration of piping system. X-ray absorption contrast by synchrotron radiation clarified convection motion inside a molten pool produced by laser welding. For surface control technologies, a new probing system was under development for heat exchanger tubes by laser cladding. And laser ablation could be used for surface cleaning. These technologies are expected for maintenance of the piping system of nuclear power plants.

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