The reactor, Tokai Daini, also has the same basic design as those that melted down in the Fukushima crisis and will be the first boiling water reactor (BWR) to be approved for a lifetime extension of 20 years.
The approval will be a boost for operator, Japan Atomic Power Co (Japco) [JATOM.UL], which is owned by the country’s main utilities and is bleeding cash because of the shutdown of its two nuclear power units.
Japan’s Nuclear Regulation Authority gave the green light to the extension on Wednesday, the regulator said.
Tokai Daini is 115 km (62 miles) northeast of central Tokyo, the closest reactor to the capital, and has nearly a million people living within a 30 kilometer radius.
“It’s impossible to evacuate these people all at once, and no matter how much time is spent on them it won’t be possible to set up escape plans,” said Toru Umino, mayor of nearby Naka city, on Oct. 24 to a group of citizens opposed to nuclear power, according to a video posted on local media.
Umino has been one of the few public officials to come out in opposition to the Tokai Daini extension. A call to mayoral staff on Wednesday went unanswered after office hours.
Naka is one of five municipalities near Tokai village, where the reactor is located, that have an agreement with Japco to be consulted on any restart, although they don’t have veto rights.
Tokai also has atomic research and other facilities, and was the site of a nuclear crisis in 1999, when workers at a processing plant not connected to Tokai Daini attempted to mix uranium in a bucket.
Two workers died and 300,000 people were told to stay indoors for up to 30 hours, after radiation escape into surrounding areas. At the time it was the world’s worst nuclear incident since Chernobyl in 1986, based on an international rating scale.
Local opposition to the extension of the Tokai plant has been strong, according to Japanese media, although residents often will not give their views.
“It’s very difficult to express one’s opinions around here,” said Alison Watts, an Australian who works as a translator and has lived in Tokai for 25 years.
Watts said she was opposed to the restart because the design of the reactors is similar to those at Fukushima and because of the threat of more big earth. (J-Power) Oma Nuclear Power Station under construction in Oma town, Aomori prefecture, Japan December 4, 2015. REUTERS/Kentaro Hamada
A company spokesman told Reuters the nuclear operator will build a tsunami protection wall to fortify Tokai Daini. Japan Atomic must also complete safety upgrades, with a restart of the plant is not expected till the 2020s.
Japan Atomic will need the approval of Tokai and prefectural authorities as well before it can resume operations.
Tokai Daini was operating when a massive earthquake struck off the northeast coast of Japan on March 11, 2011, creating a tsunami that swamped Tokyo Electric Power’s Fukushima Daichi station 113 kilometers to the north, causing explosions and meltdowns at three reactors.
The Tokai Daini plant shut down automatically but sustained damage, according to Japan Atomic.
While the extension will be a further boost for Japan’s resurgent nuclear industry, the sector will still miss a government target of providing at least a fifth of the country’s electricity by 2030, an analysis by Reuters showed last week.
Nine reactors have restarted, all of them pressurized water reactors located far from Tokyo, while the stigma of Fukushima still hangs over use of the older BWR technology.