TEPCO released the 17-page summary of its survey of the Reactor 4 building, as if to respond to the allegations by the experts foreign and domestic that the reactor building is "tilting" and on the verge of collapse. It is only in Japanese right now. (Well that was when I was writing the post. Now they have an unofficial English version. But since it took me long time to put English labels, I'll present the Japanese version with my labels anyway.)
According to the summary, TEPCO did both the horizontal and vertical measurements, looked for cracks larger than 1 millimeter-wide, and did the non-destructive inspection using Schmidt hammer.
The result of the horizontal measurements have already been published.
The company says one location on the west wall near the elevator shaft has a bulge (33 millimeters), but all the measurement points were well within the spec of the Building Standards Act.
Problem of course is that there is no independent confirmation of the data.
From TEPCO's handout for the press (5/25/2012):
Concrete strength using Schmidt hammer:
The most interesting to me personally was this slide showing the location of the Spent Fuel Pool and the locations of damages on the walls. The hole in the south wall that many people including Kyoto University's Koide have pointed to as the location for the SFP and said "If this wall collapses...". It looks like the Spent Fuel Pool is not there.