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 6), as we have obtained measurement results for tritium in samples taken on July 3 (seawater in the Unit 1-4 water intake north side and seawater, near the surface and near the bottom, inside the port between the water intakes of Units No.1 and No.2) and in samples taken on July 4 (water in the groundwater observation hole No.1-No.3), we release those results.

As a result of the measurement, tritium in seawater in the Unit 1-4 water intake north side was detected at 2,300Bq/L, which is higher than the past highest value (2,200Bq/L in the sample taken on July 1).

No significant change was found with the other measurement results compared to the previous results.

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.

<Seawater in the Unit 1-4 water intake north side>
- Tritium from sampling on July 3: 2,300Bq/L
- Tritium from sampling on July 1: 2,200Bq/L (previously announced)

<Seawater between the water intakes of Units 1 and 2 (near the surface)>
- Tritium from sampling on July 3: 230Bq/L
- Tritium from sampling on July 1: 170Bq/L (previously announced):

<Seawater between the water intakes of Units 1 and 2 (near the bottom)>
- Tritium from sampling on July 2: ND (120Bq/L)
- Tritium from sampling on July 1: ND (120Bq/L) (previously announced):

<Groundwater observation hole No.1>
- Tritium from sampling on July 4: 430,000Bq/L
- Tritium from sampling on July 1: 420,000Bq/L (previously announced)

<Groundwater observation hole No.2>
- Tritium from sampling on July 4: 530Bq/L
- Tritium from sampling on July 1: 740Bq/L (previously announced)

<Groundwater observation hole No.3>
- Tritium from sampling on July 4: 1,500Bq/L
- Tritium from sampling on June 26: 1,600Bq/L (previously announced)

* ND indicates a case where the result is below the detection limit value. The detection limit value is shown in the parentheses.