Wednesday, March 30, 2011 15:15 JST (02:15 am Wednesday March 30 ET) NHK reports that NISA says the reason for the low pressure in Units 2 and 3 reactor pressure vessels may be "weakened valves, pipes and openings under the reactors where the control rods are inserted". NISA confirmed some of their data show pressure is low, but there is no indication of large cracks or holes in the reactor vessels.
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