Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on the latest situation concerning the detection of high densities of Tritium and Strontium in the observation hole at the east side of the Unit 1-4 Turbine Buildings of Fukushima Daiichi NPS.

Today (on July 28), as we obtained a measurement result as follows for tritium in water taken on July 26 in the Unit 2 water intake power cable trench (seawater piping foundation part) where a new observation hole (B1-1) was installed for the survey currently conducted for purposes such as identification of the contamination source of high-density contaminated water inside the sea-side trench, we would like to make an announcement on the result.

This measurement result on the Unit 2 water intake power cable trench (B1-1: seawater piping foundation part) cannot be compared directly since the location is a new observation point. However, a high radioactivity density was found compared to the sample taken on July 17 from the nearby water intake power cable trench (B2).

<B1-1: Unit 2 water intake power cable trench (seawater piping foundation part)>
- Sampling on July 26:
Tritium 8,700,000 Bq/L (8,700Bq/cm³) (new)
Chlorine 8,000ppm (previously announced)
Cesium-134 750,000,000Bq/L (750,000Bq/cm³) (previously announced)
Cesium-137 1,600,000,000Bq/L (1,600,000Bq/cm³) (previously announced)
All-β 750,000,000Bq/L (750,000Bq/cm³) (previously announced)

<B2: Unit 2 water intake power cable trench> (previously announced)>
- Sampling on July 17:
Tritium 120,000Bq/L (120Bq/cm³)
Chlorine 70ppm
Cesium-134 12,000,000Bq/L (12,000Bq/cm³)
Cesium-137 24,000,000Bq/L (24,000Bq/cm³)
All-β 23,000,000Bq/L (23,000Bq/cm³)

<Quality of water leaked into the Unit 2 water intake screen room in April 2011>
Cesium-134 1,800,000,000Bq/L (1,800,000Bq/cm³)
Cesium-137 1,800,000,000Bq/L (1,800,000Bq/cm³)

We are continuing to tackle this problem in such manners as to intensely bring forward implementation of contamination prevention measures such as foundation improvement work to the bank protection, and comprehensively intensify the monitoring by using the results of additional boring to drill additional locations, and the analyses results on seawater at such locations as the port interior and the water outlets.

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