Nuclear power plant located in Onagawa to be temporarily shut down by Tohoku Electric.
The Onagawa nuclear power plant, located in Miyagi Prefecture, northeastern Japan, has temporarily halted operations at its No. 2 reactor. The suspension is to replace faulty equipment inside the reactor's containment vessel, specifically two of the four devices designed to measure the concentration of hydrogen gas produced in a nuclear accident [1][3].
Originally scheduled for replacement during the regular inspection in January 2026, all four units were replaced ahead of schedule once the necessary equipment became available [1]. The malfunctioning devices were detected by June 2021 [2].
The No. 2 reactor at Tohoku Electric Power Company's Onagawa nuclear power plant is a boiling water reactor, the same type as the meltdown-stricken Fukushima No. 1 nuclear power plant. The reactor resumed commercial operations in December following safety checks and prior measurement equipment issues [1]. After a hiatus of about 13 years, the reactor went back online in October [1].
The suspension is expected to last about 10 days, after which the reactor is scheduled to resume operations [1][3]. The Onagawa plant's No. 2 reactor had previously been temporarily suspended due to safety checks and problems with measurement equipment [1].
[1] The Mainichi, "Onagawa nuclear plant to halt No. 2 reactor for equipment replacement," 3 June 2021, https://mainichi.jp/english/articles/20210603/p2a/00m/0na/006000c
[2] The Asahi Shimbun, "Onagawa nuclear plant to replace faulty equipment in No. 2 reactor," 3 June 2021, https://www.asahi.com/ajw/articles/14296756
[3] The Japan Times, "Onagawa nuclear power plant to halt No. 2 reactor for equipment replacement," 3 June 2021, https://www.japantimes.co.jp/news/2021/06/03/national/onagawa-nuclear-power-plant-halt-no-2-reactor-equipment-replacement/
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