Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on the "water leak at a tank in the H4 area in Fukushima Daiichi Nuclear Power Station" found on August 19.

We would like to announce analysis results on seawater near the exit of the side ditch of the south water outlet and water in the side ditch in front of the core warehouse, sampled yesterday (on August 20), as follows.

As a result of the analysis this time, the densities in seawater near the exit of the side ditch of the south water outlet were found to fall within the fluctuation ranges of the past densities measured on a regular basis in seawater near the exit of the side ditch of the south water outlet. The densities in water of the side ditch in front of the core warehouse were found almost unchanged from the results obtained yesterday.

<Seawater of the south water outlet (near the exit of the side ditch) (sampling performed at 2:20 PM on August 20)>
Cesium-134:Below the detection limit value [the detection limit value: 1.1Bq/L (1.1×10^-3Bq/cm³)]
Cesium-137:1.8Bq/L (1.8×10^-3Bq/cm³)
All β:Below the detection limit value [the detection limit value: 19Bq/L (1.9×10^-2Bq/cm³)]

<Water of the side ditch in front of the core warehouse (sampling performed at 11:40 AM on August 20)>
Cesium-134:Below the detection limit value [the detection limit value: 19Bq/L (1.9×10^-2Bq/cm³)]
Cesium-137:Below the detection limit value [the detection limit value: 27Bq/L (2.7×10^-2Bq/cm³)]
All β:93Bq/L (9.3×10^-2Bq/cm³)

We are to continuously conduct analysis today on seawater of the south water outlet (near the exit of the side ditch) and water of the side ditch in front of the core warehouse.

For the past sampling results, please refer to the following page on our website:
http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/index-e.html

* We initially posted the underlined value as 1×10^-3Bq/cm³, which is incorrect. We corrected this value to 1.1×10^-3Bq/cm³ on August 22.