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Journal Articles

Demonstration of under sodium viewer in Monju

Aizawa, Kosuke; Sasaki, Koei; Chikazawa, Yoshitaka; Fukuie, Masaru*; Jimbo, Noboru*

Nuclear Technology, 204(1), p.74 - 82, 2018/10

 Percentile:100(Nuclear Science & Technology)

Development of inspection technique in opaque liquid metal coolant is one of the important issues to ensure the safety of Liquid Metal Fast Breeder Reactor (LMFBR). Performance tests of an Under Sodium Viewer (USV), which was developed to detect an obstacle in the reactor vessel (RV) of LMFBR Monju, have been carried out. The ultrasonic sensors and reflectors are located across the core inside of the Monju's RV. The USV can detect an obstacle existing in between the core top and the Upper Core Structure (UCS) bottom by identifying differences of echo signals. This report describes the USV performance tests. In the tests, the reference echo signals under various conditions were accumulated and the signal to noise ratio successfully exceeded the target value. Measured signals clearly differed from with and without an obstacle. These experimental results show the performance of the USV for detecting an obstacle in the specified place.

Journal Articles

Performance test of under sodium viewer in Monju

Aizawa, Kosuke; Togashi, Yoshinori; Sasaki, Koei; Chikazawa, Yoshitaka; Fukuie, Masaru*; Jimbo, Noboru*

Proceedings of 2015 International Congress on Advances in Nuclear Power Plants (ICAPP 2015) (CD-ROM), p.808 - 816, 2015/05

Inspection technique in opaque liquid metal coolant is one of the important issues for the safety warranty of Liquid Metal Fast Breeder Reactor (LMFBR) core. A performance test of Under Sodium Viewer (USV) which was developed to detect obstacles in reactor vessel of LMFBR Monju was carried out. The ultrasonic sensors and reflectors are located across the core inside the Monju reactor vessel. The USV detects the obstacle between the core top and the bottom of Upper Core Structure (UCS) by differences of echo signals. This reports showed the USV performance test in Monju before power operation. In the test, the basic echo signals in various conditions were accumulated and signal to noise ratio met with the design value. Measured signals with and without obstacles showed difference clearly. Those experimental results showed that basic performance of the USV to detect an obstacle between the core and UCS.

Oral presentation

Present status of Action Plan for fusion DEMO

Nishimura, Arata*; Okano, Kunihiko*; Ikebe, Yasushi*; Oba, Kyoko; Kasada, Ryuta*; Sakamoto, Ryuichi*; Sawa, Naoki*; Ishii, Yasutomo*; Kashiwagi, Mieko*; Takenaga, Hironobu*; et al.

no journal, , 

no abstracts in English

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