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Mistaken emergency shutdown at Kyoto U. research reactor

In this June 21, 2017 file photo, a member of the Kyoto University Research Reactor Institute's teaching staff, seated, is seen at the reactor's controls, in Kumatori, Osaka Prefecture. (Mainichi)

KUMATORI, Osaka -- Kyoto University's research reactor here had an emergency shutdown during an experiment in January, it was announced on Feb. 22.

    The Kyoto University Research Reactor Institute's 5,000-kilowat reactor was restarted in August last year. The emergency shutdown was mistakenly triggered by a power failure detection system, which malfunctioned due to deteriorating components. There was nothing wrong with the reactor itself, and there was no radiation leak, the institute stated.

    The incident was reported to the Nuclear Regulation Authority, and the reactor went back into service after a safety check.

    According to the institute, the reactor's electrical relay had not been updated since the 1999 academic year.

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