Fukushima Daiichi NPS Prompt Report 2013

At around 10:04 AM today (on August 19), an alarm indicating the high-high radioactivity level went off at the continuous dust monitor installed in front of the Main Anti-earthquake Building. Due to this, at 10:15 PM, an instruction was given to put on masks in the areas not requiring full-face (or half-face) masks in the power station site.

Currently, the status of the continuous dust monitor is being confirmed, and measurement using a portable dust sampler is being performed at the site. We will announce the status, etc. soon after they are ready.

Neither abnormality on the plant data (reactor injection water amount, spent fuel pool water temperature, etc.) nor significant change in the monitoring post data has been found. Also, no significant change was found in the readings of continuous dust monitors installed at locations other than the Main Anti-earthquake Building. For these reasons, we consider that there is no impact on the outside of the power station.