Fukushima Daiichi NPS Prompt Report 2013

Neither serious trouble nor change in the monitoring data has been found

TOKYO-Oct. 16, 2013. Although typhoon No. 26 (Wipha) passed over Japan on October 16 (Wed), since adequate precautionary measures were taken, neither serious trouble at Fukushima Daiichi NPS, nor change in the monitoring data at the sea area inside and around the power station, has been observed. Judging by the monitoring results of the seawater, there has been no impact on the waters of the ocean. The reactor cooling system, the spent fuel pool cooling system and the contaminated water treatment apparatus are all operating as normal.

The following countermeasures were implemented by TEPCO in advance.
-Lashing and protection of machinery, cables, hoses, etc.
-Taking down of crane booms to prevent them from overturning
-Suspension of all offshore work
-Suspension of part of onshore work

Meanwhile, to prevent accumulated water inside the dikes ^(*1) from overflowing, this was drained to the outside of the dikes, after TEPCO confirmed that the radioactive material density in the water was below the discharge standard ^(*2).

*1 Each group of tanks in which the contaminated water accumulates at the Fukushima Daiichi NPS is set up on a concrete foundation and surrounded by a 30 centimeter-tall dike.
*2 The discharge standard is the provisional standard established by the Japanese government and TEPCO, and is set to be lower than the sea discharge standard value.

<Discharge standard>
-Cesium-134: Below 15Bq/L (Sea Discharge Standard Value: 60 Bq/L)
-Cesium-137: Below 25Bq/L (Sea Discharge Standard Value: 90 Bq/L)
-No detection of the other γ nuclides (excludes natural nuclides)
-Strontium-90: Below 10Bq/L (Sea Discharge Standard Value: 30 Bq/L)
-Satisfaction of the notification levels for the other nuclides, by using water quality, etc. of the tanks as a reference.

TEPCO, Inc. is a provider of electricity to the Kanto region, which includes Tokyo and Yokohama. The company is headquartered in Tokyo. The Fukushima Daiichi Nuclear Power Station was struck by a tsunami after an earthquake that occurred in March 2011. For more information, please go to http://www.tepco.co.jp/en/index-e.html.