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Friday, October 24, 2014  

Japan mulls closure of N-reactors by April
TOKYO All 54 of Japan’s nuclear reactors may be shut by next April, adding more than $30 billion a year to the country’s energy costs, if communities object to plant operating plans due to safety concerns, trade ministry officials said on Wednesday.  

Since the March 11 earthquake and tsunami, which triggered a radiation crisis at the Fukushima Daiichi plant north of Tokyo, concern among local authorities has kept nuclear generators from restarting at least four reactors that had been expected to come online after routine maintenance and inspection.  

Several more reactors have since shut for regular maintenance, slashing Japan’s nuclear generating capacity to just 7,580 megawatts, or only 36 per cent of its registered  nuclear capacity.

Although a reactor is legally cleared for restart once it receives approval from the Nuclear and Industrial Safety Agency, a trade ministry watchdog, nuclear operators always seek local government approvals as well, for the support from the community around the plant.  

If no reactors that shut for regular maintenance after the disaster are restarted, it would cost an extra 2.4 trillion yen ($30 billion) to make up lost power generation during the financial year to next March, a trade ministry estimate showed.  

If all of Japan’s reactors end up offline without any restarts, the extra cost would escalate to 3 trillion yen a year, reflecting the need to buy more fossil fuels  while the use of renewable energy remains limited.  

Among the 19 Japanese reactors that remain online, the last due to be shut for inspections,  on April 9, 2012, is the 1,356 megawatt No.6 reactor at Tokyo Electric’s Kashiwazaki-Kariwa plant in northwestern Japan, an official said. The reactor came out of its last maintenance period just days before the disaster.  

In Japan, nuclear generators currently must shut for inspection at least once every 13 months.  

The maintenance period can vary widely, from a few months to more than a year, and the restart typically begins with a one- to two-month test run before advancing to commercial operation, which require regulatory approval.

Reuters
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