Things continue to develop at the Daiichi and Daini nuclear power stations in Japan today. As you have already heard, a second reactor building exploded at Daiichi, it was the Unit 3 which had been experiencing the same problems as Unit 1, which also exploded.

What is believed to have happened is that hydrogen gas which was released along with the steam to reduce the pressure in the reactor vessel built up in the generation building and then a random spark ignited it. The building is seen to have the same kinds of damage that the Unit 1 building had.