Following up this article..Possible uneven settlement of reactor 4
A crack on concrete of reactor 4 building has been observed since last July.
It’s assumed to be from the first floor to the middle of SFP4.
(Between the two yellow lines on those pictures below.)
↓ 7/2011
↓ 2/2012
↓ 3/2012
↓ 4/2012
↓ 4/2012
↓ The crack is probably on the yellow arrow.
Iori Mochizuki