Here are some updates from the Fukushima Dai-ichi nuclear reactors as of April 12 at 15:30.
- They have spread an anti-scattering agent to prevent radioactive materials from dispersing in an area near the common pool.
- A fire was discovered at 6:38am on April 12 at the water spout sampling building for reactors #1 to #4 (not sure what that means: １から４号機放水口サンプリング建屋). After some initial fire extinguishing efforts, the flame and smoke disappeared before 7:00am. It was later (9:12am) confirmed that the fire was out.
- Between 12:00 and 13:14, sampling work was done to determine the state of the fuel in the spent fuel pool in reactor #4.
Source: http://kinkyu.nisa.go.jp/kinkyu/2011/04/89121530.html (Nuclear and Industrial Safety Agency)