in the morning of 18 july 2013 at 8:20 a.m. (2320 gmt) small amounts of steam escaped from the reactor building. video images made by a subcontractor, filming the destroyed building and preparing to remove rubble from the place, showed some vapors rising, but it was unclear where it came from. although there was no change in the afternoon, tepco said that radiation levels did not change, and the reactor was still cooled. according to tepco rain could have found its way to the primary containment of the reactor, and because this vessel was still hot, it could cause the steam.