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WBUR / BOSTON — It was three years ago Tuesday that nuclear reactors in Fukushima, Japan, were hit by a huge tsunami and started melting down.

The reactors at Fukushima are the same type as the one at the only nuclear power station in Massachusetts. On this anniversary, Gov. Deval Patrick is taking up the cause of activists who want the Pilgrim reactor in Plymouth shut down.

The governor agreed to get involved after a State House demonstration and sit-in at his office.