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Tagawa, Akihiro; Ueda, Masashi; Yamashita, Takuya; Narisawa, Masataka*; Haga, Koichi*
Journal of Nuclear Science and Technology, 48(4), p.504 - 509, 2011/04
This paper describes the development of a new inspection robot for the in-service inspection of the heat transfer system of the fast breeder reactor MONJU. The inspection was carried out using a tire-type ultrasonic sensor for volumetric tests at high temperature (atmosphere, 55 
C; piping surface, 80 C) and radiation exposure condition (dose rate, 10 mGy/h; piping surface dose rate, 15 mGy/h). An inspection robot using a new tire type for the ultrasonic testing sensor and a new control method was developed. A signal-to-noise ratio S/N over 2 was obtained during the functional test for a calibration defect with a depth of 50%t (from the tube wall thickness). In the automatic inspection test, an EDM slit with a depth of 9% from the pipe thickness was detectable and with an S/N ratio = 4.0 (12.0 dB).
Narisawa, Masataka
no journal, ,
no abstracts in English
Tagawa, Akihiro; Narisawa, Masataka*; Yamashita, Takuya
no journal, ,
This paper describes the development of a new inspection robot for the in-service inspection (ISI) of the heat transfer system of the FBR MONJU. The inspection is carried out using a tire type for volumetric tests at elevated temperature (Atmosphere 55 C, Piping Surface 80 C) and irradiation dose condition (Dose Rate 10mSv/h, Piping Surface Dose Rate 15mSv/h). The inspection robot which took in a new tire type ultrasonic testing sensor and a new control method was developed.Detection goals that signal to noise ratio by over 2 for 50% thickness defect of wall were attained as a result of the functional test.
