The largest nuclear power plant in the world may be forced to shut down under tightened rules proposed by Japan’s new nuclear watchdog aimed at safeguarding against earthquakes, a report said on Friday.
Tokyo Electric Power Co’s (TEPCO) vast Kashiwazaki-Kariwa plant in central Japan could be on the chopping block if the Nuclear Regulation Authority (NRA) expands the definition of an active fault.
The movement of a fault — a crack in the Earth’s crust — can generate massive earthquakes like the one that sparked a tsunami that slammed into the Fukushima Dai-ichi plant in March 2011, setting off the worst atomic crisis in a generation.
The watchdog is planning to define an active fault as one that moved any time within the past 400,000 years, rather than the current 120,000 to 130,000-year limit, an official said, which could spell the end of the TEPCO plant.
“The new guidelines will be put into effect in July, and then we will re-evaluate the safety of each of Japan’s nuclear plants,” the NRA official said, adding that no decisions would be made until the new rules were in place.
At least two “non-active” faults underneath the site’s reactors could be ensnared by the new definition, forcing its closure, according to a report in the mass-circulation Yomiuri newspaper on Friday.
Other Japanese media have carried similar reports.
A company spokesman said TEPCO was conducting more tests on the faults underneath the Kashiwazaki-Kariwa plant, the world’s biggest by generating capacity.
The NRA is conducting or planning to conduct investigations into six other nuclear plants in Japan.
At present only two of the country’s 50 reactors are operational, after the entire stable was shuttered over several months for scheduled safety checks. Public resistance has meant the government has been reluctant to give the go-ahead for their re-starting.
The two reactors that are working are both being investigated by seismologists.
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