OS6-5 光ファイバを用いた高速炉構造健全性監視技術の開発(OS6 設備診断・運用保全技術,循環型社会における動力エネルギー技術)

概要

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The structures of Sodium-cooled Fast Reactors (SFRs) are designed to mitigate thermal stress by thin-walled piping, to accommodate thermal expansion by long piping with elbows and to make sure of seismic insulation by piping support system. Therefore, it is important to measure the stress on the cooling system piping, and the displacement and vibration on the related components in order to assure the structural integrity. In the experimental fast reactor Joyo, displacement and vibration measurements of the primary cooling system have been carried out using Fiber Bragg Grating (FBG) sensors to evaluate the durability and measurement accuracy of FBG sensors in a high gamma-ray environment. The data were successfully obtained with no significant signal loss up to an accumulated gamma-ray dose of approximately 7×10^4 Gy corresponding to 180 EFPDs (effective full power days) operation. The measured results indicate that the FBG sensor is applicable for monitoring the displacement and vibration aspects of SFR's cooling system integrity in a high gamma-ray environment.
一般社団法人日本機械学会の論文
2007-06-13