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Troubles still dog Japanese plant

– The radioactive water that has accumulated at Japan’s crippled nuclear power plant remains the biggest problem hampering the cleanup three years after the disaster.

The Fukushima Dai-ichi plant has stabilized substantially since the March 11, 2011, earthquake and tsunami destroyed its power and cooling system, triggering meltdowns. Massive amounts of water are being used to cool the melted cores at three reactors, but some of the contaminated water has seeped through the ground into the Pacific and leaked repeatedly from storage tanks.

Plant chief Akira Ono said Monday that improving water management is crucial not only to the plant cleanup but also decontamination of the area so evacuees can return to their homes.

More than 100,000 people have not returned home due to fear of radiation from the plant.

“The most pressing issue for us is the contaminated water, rather than decommissioning,” Ono said during a plant tour for foreign media, including The Associated Press. “Unless we resolve the problem, fear of the society continues and the evacuees cannot return home.”

Experts say the water leaks are spreading radiation across the plant and into the sea, hampering the cleanup.

In order to mitigate the problem, TEPCO will build an underground ice wall around the four damaged reactor units to block contaminated water from leaking out while keeping underground water from flowing in – a multibillion-dollar government-funded project.

The plant has accumulated 436,000 tons of contaminated water stored in 1,200 industrial tanks that have taken over large parts of the plant.

TEPCO has developed a set of water treatment units that can remove all radioactive elements but tritium for safer storage of the water and is currently working to build another set, while developing its upgraded version as part of a government-funded project. The plant is feared to run out of storage capacity sometime next year.

Dale Klein, former U.S. Nuclear Regulatory Commission chairman who heads a group of outside advisers for TEPCO’s nuclear reform, said scientists agree that tritium can be safe in a controlled release.

“Storing the massive amounts of water in tanks is not sustainable,” said Klein, who was also at the plant Monday. “My assessment is it’s not science that needs to be developed, but it’s public policy.”