Japanese engineers are still trying to seal a crack in a reactor at the Fukushima Daiichi nuclear plant, damaged in the country’s earthquake and tsunami more than three weeks ago.
Initial attempts to solve the problem by pouring concrete into the fissure failed.
Now the experts are trying to plug the leak using an absorbent polymer.
Meanwhile, the bodies of two missing workers have been found.
A spokesman from the Tokyo Electric Power Company said: “Two of our employees disappeared on the day of the tsunami whilst going about their inspection work. On March 31 we found their dead bodies in the basement of the turbine building.”
A 20 kilometre exclusion zone remains in place around the plant which officials say will be long term.
It is thought the crack in reactor number two is one source of leaks that have caused radiation levels in the sea to rise to more than 4000 times the legal limit.
As a result, high levels of radiation have also been found in drinking water and locally grown food products.
The crisis prompted opponents of nuclear power to take to the streets of Tokyo in protest on Sunday.
The demonstrators gathered outside the headquarters of the Tokyo Electric Power Company chanting “we don’t need nuclear power stations”.