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Japan may raise nuclear leak to 'serious'

Agencies | Updated: 2013-08-22 08:45

Japan may raise nuclear leak to 'serious'

Workers wearing protective suits and masks inspect contaminated water storage tanks at Tokyo Electric Power Co's tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima, Japan, on Tuesday. Kyodo via Reuters

TOKYO - Japan's nuclear watchdog on Wednesday said a leakage of highly radioactive water at the crippled Fukushima nuclear power plant could be the beginning of a new disaster - a series of leaks of contaminated water from storage tanks.

The operator of the plant has built hundreds of steel tanks to store massive amounts of radioactive water coming from three melted reactors, as well as underground water running into reactor and turbine basements.

Tokyo Electric Power Co. said on Tuesday that about 300 tons (300,000 liters, 80,000 gallons) of contaminated water leaked from one of the tanks. It said it hasn't figured out how or where the water leaked, but suspects it did so through a seam.

The leak is the fifth, and the worst, since last year involving tanks of the same design at the wrecked Fukushima Dai-ichi plant, raising concerns that contaminated water could begin leaking from storage tanks one after another.

"That's what we fear the most. We must remain alert. We should assume that what has happened once could happen again, and prepare for more," Nuclear Regulation Authority Chairman Shunichi Tanaka told a news conference. "We are in a situation where there is no time to waste."

The watchdog also proposed at a weekly meeting Wednesday to raise the rating of the seriousness of the leak to level 3, a "serious incident," from level 1, "an anomaly," on an International Nuclear and Radiological event scale of eight.

The watchdog urged TEPCO to step up monitoring for leaks and take precautionary measures.

During the meeting, officials also revealed that plant workers apparently have overlooked several signs of leaks, suggesting that their twice-daily patrols were largely just a walk. They have not monitored water levels inside tanks, obviously missed a puddle forming at the bottom of the tank earlier, and kept open a valve on an anti-leakage barrier around the tanks.

TEPCO said the leaked water is believed to have mostly seeped into the ground after escaping from the barrier around the tank. It initially said the leak did not pose an immediate threat to the sea because of its distance - about 500 meters (1,650 feet) - from the coastline.

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