Primary 1 Fukushima: 1000 2nd Floor Unit 1 mSv, Mainichi, May 11, 2011:
Nuclear and Industrial Safety Agency Ministry of Economy, Trade and Industry on July 11 on the second floor of Unit 1 nuclear reactor Hukushima first TEPCO announced that it has measured high levels of radioactive material exceeding 1000 mSv per hour.
EX-SKF adds a more precise translation:
Measurement was done for 5 minutes starting 12:45PM on May 10 (JST), and at 1.6 meters from the floor the Geiger counter went overscale [...]
Published: May 13th, 2011 at 7:51 pm ET