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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Call for 2026 ANS Special Award suggestions
With this year’s awards already presented at the American Nuclear Society Annual Conference in June, the ANS Honors and Awards (H&A) Committee has set its sights on planning for next year’s distinctions. To that end, the H&A Committee is now soliciting suggested topics for the 2026 Special Award.
Kosuke Aizawa, Koei Sasaki, Yoshitaka Chikazawa, Masaru Fukuie, Noboru Jinbo
Nuclear Technology | Volume 204 | Number 1 | October 2018 | Pages 74-82
Technical Paper | doi.org/10.1080/00295450.2018.1469346
Articles are hosted by Taylor and Francis Online.
Development of an inspection technique in opaque liquid-metal coolant is one of the important issues to ensure the safety of the 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 the LMFBR Monju, have been carried out. Ultrasonic sensors and reflectors are located across the core inside Monju’s RV. The USV can detect an obstacle existing between the core top and the upper core structure bottom by identifying differences of echo signals. This paper 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 with and without an obstacle. These experimental results show the performance of the USV for detecting an obstacle in a specified place.