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Steam seen at Fukushima reactor building

18 July 2013, 14:12

Tokyo - Steam is rising from a destroyed building that houses a reactor at Japan's crippled Fukushima Daiichi nuclear power plant, the operator of the plant, Tokyo Electric Power Comapny (Tepco), said on Thursday.

The utility said the levels of radioactivity around the plant had remained unchanged and it was still looking into what triggered the emission.

"We think it's possible that rain made its way through the reactor building and having fallen on the primary containment vessel, which is hot, evaporated, creating steam," said Tepco spokesperson Maymi Yoshida, adding it was still investigating the matter.

Each reactor is surrounded by a primary containment vessel. This is made of strengthened steel 10 to 20cm. It provides the most critical line of defence against leaking radiation from the reactor.

A massive earthquake and tsunami in 2011 killed nearly 20 000 people and set off the world's worst nuclear crisis in 25 years when the Fukushima plant was destroyed causing reactor meltdowns, hydrogen explosions and leaking radiation into the sea and air.

The steam rising from the reactor No3 building was spotted at 08:20 (0520 GMT) by a subcontractor who was filming the destroyed building and preparing to remove rubble from the site. It was still visible around two hours later, Yoshida said.

The latest findings underscore the difficulties Tepco is facing in trying to keep the ravaged plant under control. About a week ago a huge spike in radioactive cesium was detected in groundwater 25m from the sea.

The operator has been flushing water over the damaged reactors to keep them cool for more than two years, but contaminated water has been building up at the rate of an Olympic-size swimming pool per week.

In April, Tepco warned it may run out of space to store the water and asked for approval to channel what it has described groundwater with low levels of radiation around the plant and to the sea through a "bypass". Local fishermen oppose the proposal.

- Reuters


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