AP: Integrity of Reactor No. 4 building a major concern among experts — Collapse of spent fuel pool could be even worse than 3 reactor meltdowns

[...] TEPCO spokesman Junichi Matsumoto [...] said officials are investigating the cause of that leak, but that it was unlikely the pipe had been loosened by the many aftershocks that have hit the plant.

The structural integrity of the damaged Unit 4 reactor building has long been a major concern among experts because a collapse of its spent fuel cooling pool could cause a disaster worse than the three reactor meltdowns. [...]

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