Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information regarding the water leak from a drain valve of a tank dike in the H4 area in Fukushima Daiichi NPS.

At 7:00 PM on August 19, we started collecting water in the tank dike. Water was pumped up with a temporary pump to a temporary tank, and absorbent was placed inside the dike. Water collected until around 11:00 PM on the same day is approx. 4 m³.

In addition, the nuclide analysis results of water obtained so far are as follows:

<Leakage water of the H4 area tank (sampling performed at 4:00 PM on August 19)>
Cesium-134:4.6 x 10¹ Bq/cm³
Cesium-137:1.0 x 10² Bq/cm³
Iodine-131:Below the detection limit value (3.1 x 10⁰ Bq/cm³)
Cobalt-60:1.2 x 10⁰ Bq/cm³
Manganese-54:1.9 x 10⁰ Bq/cm³
Antimony-125:7.1 x 10¹ Bq/cm³
All β:8.0 x 10⁴ Bq/cm³
Chloride density:5,200ppm

<Sand sedimentation pond (sampling performed at 3:10 PM on August 19)>
Cesium-134:Below the detection limit value (2.0 x 10^-2 Bq/cm³)
Cesium-137:Below the detection limit value (2.6 x 10^-2 Bq/cm³)
Iodine-131:Below the detection limit value (1.3 x 10^-2 Bq/cm³)
Cobalt-60:Below the detection limit value (1.3 x 10^-2 Bq/cm³)
All β:4.1 x 10¹ Bq/cm³

<Water sampled at side ditch in front of core warehouse (sampling performed at 3:00 PM on August 19)>
Cesium-134:Below the detection limit value (1.9 x 10^-2 Bq/cm³)
Cesium-137:Below the detection limit value (2.7 x 10^-2 Bq/cm³)
Iodine-131:Below the detection limit value (1.0 x 10^-2 Bq/cm³)
Cobalt-60:Below the detection limit value (1.4 x 10^-2 Bq/cm³)
All β:1.3 x 10^-1 Bq/cm³

We will continue to analyze water sampled at side ditch in front of core warehouse today, and also will analyze seawater sampled at the location connected to this ditch today.

Further, as for soil outside the dike, we will perform removal work from today's morning.

* We have corrected the underlined values on August 21, since there were errors in the previous translation. We sincerely apologize for the mistake.