Japanese nuclear watchdog approves operating life extension for ageing, tsunami-hit plant
- Japan Atomic Power’s Tokai No. 2 plant, found north east of Tokyo, uses the same boiling water reactor as the crisis-hit Fukushima Daiichi power plant
- The Tokai plant has been stood idle since a magnitude 9.0 quake and subsequent tsunami wreaked havoc along the country’s east coast in March 2011
Japanese authorities on Wednesday approved for the first time an extension to the 40-year operating life of one of the nuclear power plants affected by the 2011 earthquake and tsunami disaster.
Japan’s nuclear watchdog allowed an extension of up to 20 years beyond the November 28 limit for Japan Atomic Power Co.’s Tokai No. 2 plant in Ibaraki Prefecture, north east of Tokyo. The plant uses the same boiling water reactor as the crisis-hit Fukushima Daiichi power plant.
The move, together with previous extensions of the operating limit at three other ageing nuclear reactors, could undermine the 40-year cap the country applies in principle to nuclear complexes. The Nuclear Regulation Authority (NRA) had said extension beyond that would be “a rare exception.”
“We had factored in the NRA’s approval. It just means the NRA has lost its authority,” said Tatsuya Murakami, a 75-year-old former mayor of the plant’s host village, Tokai.
“With the Fukushima crisis we have witnessed how a nuclear accident can displace people, depriving them of the places they belong to,” he said, calling for a serious debate on evacuation plans in the event of a major accident at the plant.
Some 20 protesters gathered before the NRA building in the morning and submitted 15,000 signatures collected from people across Japan opposed to the approval of the extension.
The Fukushima Daiichi power plant in neighbouring Fukushima Prefecture suffered fuel meltdowns triggered by the magnitude 9.0 quake and subsequent tsunami on March 11, 2011.
The same quake caused a 5.4-metre (17.7-foot) tsunami to hit the Tokai plant, left it without an external power source and incapacitated one of its three emergency power generators, although the plant managed to cool down its reactor using the remaining power generators.
In late September, the NRA formally approved the restart of the Tokai plant, which has been idled since the disaster.
But even with the approvals for the restart and extension of its operating limit, it remains unclear when the plant will actually get back online, as construction work to enhance its safety will not be completed until March 2021.
It also needs to obtain consent from all of its host and surrounding municipalities, being the sole nuclear power plant in Japan to need approval from local governments beyond its immediate host.
The plant also faces the hurdle of having to compile an evacuation plan covering 960,000 residents within a 30-kilometre (19-mile) radius – the largest number of potential evacuees for a nuclear plant in Japan because of its location in the metropolitan region.
Japan Atomic Power applied for the plant’s restart in May 2014 with a plan to construct a 1.7 kilometre-long (1.1 miles) coastal levee, predicting a potential tsunami as high as 17.1 metres (56.1 feet).
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The cost for safety measures at the plant is estimated to reach some 180 billion yen (US$1.6 billion), and the operator, solely engaged in the nuclear energy business, has been struggling as none of its reactors have been online since the 2011 disaster.
The Tokai plant boasts an output capacity of 1.1 million kilowatts, while the output capacities of the three other nuclear power units given the green light to operate beyond 40 years are 800,000kW or more.
Japan has decided to scrap nuclear power reactors with an output of around 500,000kW or lower as these are seen as difficult to turn profitable because of the massive investment required to boost safety.
Kyushu Electric Power Co., the operator of Genkai No. 2 plant in Saga Prefecture, which has an output of 559,000kW, will soon face decisions on whether it should be scrapped or have its operating limit extended as 37 years have passed since it went into service.