The explosion blew the roof off the containment vessel that is used as a barrier surrounding the reactor’s core. The reactor was not harmed, officials say.
Officials say it is very unlikely that that the explosion resulted in a release of large amounts of radiation. However, the explosion that occurred on Saturday at Reactor 1 did release some radioactive material.
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Officials are now saying it is very likely that the cores of reactors 1 and 3 are partially melted. They found radioactive material near the plant that is released when the fuel rod is melting. The melting is said to have occurred because of cooling problems that overwhelmed the plant after the earthquake and tsunami struck Friday.
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