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Ohi No.4 reactor restarted

Japan’s 8th reactor is back online. Kansai Electric Power Company on Wednesday restarted a reactor at the Ohi plant in Fukui Prefecture, central Japan.
 
At the plant, workers pulled out the control rods that suppress atomic fission of the No.4 reactor.
 
The facility is expected to reach criticality early Thursday, begin power generation and transmission on Friday and go into commercial operation in early June.
 
The reactor had complied with new government regulations put in place following the 2011 Fukushima Daiichi nuclear accident.
 
Two months earlier, the utility reactivated the No.3 reactor at the plant. Two more reactors are running at its Takahama plant about 13 kilometers west of Ohi.
 
Although they all passed the government’s new regulations, attention is now focused on the threat of multiple accidents at these plants in the event of an earthquake and tsunami.
 
This summer, the government plans to hold its first drill based on a scenario that accidents have occurred simultaneously at the Ohi and Takahama plants.
 
In 2014, the Fukui District Court ruled against putting the No.3 and No.4 reactors at Ohi back online. It said estimated tremors of possible quakes at the plant are too optimistic. The ruling was appealed to a higher court, which has yet to decide the issue.
 

 

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May 10, 2018 Posted by | Japan | , | Leave a comment

Japan’s Kansai Electric used possibly falsified Mitsubishi Materials products at reactors

TOKYO (Reuters) – Japan’s Kansai Electric Power Co said on Wednesday it has used parts in important safety equipment at two of its nuclear plants that were supplied by a unit of Mitsubishi Materials Corp with possibly falsified data.
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TOKYO (Reuters) – Japan’s Kansai Electric Power Co said on Wednesday it has used parts in important safety equipment at two of its nuclear plants that were supplied by a unit of Mitsubishi Materials Corp with possibly falsified data.
Mitsubishi Materials Corp. President Akira Takeuchi (2nd R) bows with Executive Vice President Naoki Ono (2nd L), Mitsubishi Shindoh Co. President Kazumasa Hori (L) and Mitsubishi Cable Industries Ltd. President Hiroaki Murata during a news conference in Tokyo, Japan November 24, 2017.
The utility has found it is using rubber seals from Mitsubishi Cable Industries with possible falsified specifications in dozens of locations at its Takahama and Ohi nuclear plants, a spokesman said, confirming Japanese media reports.
The discovery comes after Kansai Electric delayed the restart of one of the nuclear power stations because it needs to make checks on parts supplied by Japan’s Kobe Steel Ltd, which, like Mitsubishi Materials, is embroiled in a scandal over product specifications.
The utility has told Japan’s nuclear regulator that it has not found any immediate safety issues, the spokesman said.
Kansai Electric receives rubber seals from multiple suppliers and is having difficulties identifying which ones come from Mitsubishi Materials, he said. The company does not plan to switch suppliers, the spokesman said.
Rubber seals are used in large numbers in the extensive piping found in nuclear reactors and their cooling systems and can be subject to high temperatures and pressure.
Mitubishi Materials and Mitsubishi Cable both declined to comment on Wednesday.
Mitsubishi Materials previously said it had discovered that products with falsified specifications had been sent to more than 300 of its customers.
That was the latest in a slew of scandals to rock Japan’s manufacturing industry. Apart from Kobe Steel, similar lapses on specifications have been found at Toray Industries Inc and incorrect final inspection procedures were discovered by automakers Nissan Motor Co and Subaru Corp.
Kansai Electric’s delays and checks on Ohi reactors are further hitches to the protracted reboot of Japan’s nuclear sector, shut down in the wake of the Fukushima disaster in 2011.
Kansai Electric does not plan to close down the Takahama station for checks, or expect any additional delays on the restart of Ohi, the spokesman said.

December 21, 2017 Posted by | Japan | , , , , | Leave a comment