"To build such a wall, the government should take the lead to promote this kind of project," Suga said. "We have to provide the support to do so."
TEPCO, the country's largest utility, has been grappling with water issues ever since the Fukushima Daiichi plant was hit by the March 2011 earthquake and tsunami that devastated eastern Japan. Scientists who monitor radiation levels offshore have pointed to persistent high readings as evidence of an ongoing leak for more than a year, but the utility did not publicly admit the problem until late July.
Vast stands of storage tanks have grown up around the plant as TEPCO tries to manage the hundreds of tons of water involved every day, and the company has built an underground barrier to prevent contaminated groundwater from reaching the sea. But it remains a difficult problem, Masayuki Ono, TEPCO's acting nuclear power chief, said earlier this week.
"It's a present reality that the contaminated water is seeping out to the bay without us being able to control it," Ono said.
TEPCO is also pumping hundreds of tons of water a day into the plant to cool the crippled reactors two and a half years later, though most of that fluid is recycled.
The 2011 tsunami swamped the plant, located 240 km (150 miles) north of Tokyo, and knocked out power to cooling systems for the three reactors that were operating at the time. The result was the second-worst nuclear accident in history, trailing only the 1986 disaster at Chernobyl, in the former Soviet Union.
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