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by ErrantX 5571 days ago
That's talking about the reactor building (i.e. the outer walls). It's not 100% clear but they were at one point demolishing those walls to help vent hydrogen from the building. But I saw anbother source saying an explosion in that building caused the holes.

(Unit 4, BTW, is shut down & stable, but it is the building with the fire in the spent fuel pond)