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Journal Articles

Observation of vibration characteristics of a cylindrical water tank by a phase-shifted optical pulse interference sensor

Morishita, Hideki*; Yoshida, Minoru*; Nishimura, Akihiko; Matsudaira, Masayuki*; Hirayama, Yoshiharu*; Sugano, Yuichi*

Hozengaku, 20(1), p.101 - 108, 2021/04

no abstracts in English

Journal Articles

Support for the development of remote sensing robotic system using a water tank installed in the Naraha Remote Technology Development Center

Nishimura, Akihiko; Yoshida, Minoru*; Yamada, Tomonori; Arakawa, Ryoki

Proceedings of International Topical Workshop on Fukushima Decommissioning Research (FDR 2019) (Internet), 3 Pages, 2019/05

JAEA support the development of remote sensing robotic system in the Naraha Remote Technology Development Center. A water tank is used as a mockup facility of nuclear reactor vessel. A compact seismic vibrometer based on an optical fiber interferometer is applied. A specially designed robotic system is also tested for installing the sensor unit. The experiment is prepared to clarify the transfer function of the water tank, using vibration noise of ground motion.

Oral presentation

Study on rapid analysis of the radioactive tritium in groundwater into the Fukushima-1 Nuclear Power Plant, 1; Applicability confirmation of the tritium column

Sasaki, Takayuki*; Akimoto, Yuji*; Seki, Kotaro; Nagano, Misato*; Ishimori, Kenichiro; Ueno, Takashi; Kameo, Yutaka

no journal, , 

no abstracts in English

Oral presentation

Development of microearthquake response detection by optical fiber seismic vibrometer with a water tank and a specially designed robotic system

Nishimura, Akihiko; Morishita, Hideki*; Yamada, Tomonori; Yoshida, Minoru*; Tagawa, Akihiro

no journal, , 

For decommissioning of the Fukushima Daiichi Nuclear Power Station, installation of an optical fiber seismic vibrometer using a specially designed robotic system was demonstrated. A water tank with 4.5m diameter and5m depth was used as a demo plant of tank type critical assembly. Micro earthquake response of a water tank was detected by the optical fiber seismic vibrometer. Vibration characteristic of the window of the water tank was monitored by laser Doppler interferometer.

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