TEPCO - Pres releases on water leak

Press Release (Apr 06,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.5)

http://www.tepco.co.jp/en/press/corp-com/release/2013/1226125_5130.html

This is follow-up information regarding the water leak from the underground reservoir No. 2 in Fukushima Daiichi NPS.

Since 5:43 am on April 6, we have been transferring the water from the underground reservoir No. 2 to the underground reservoir No. 1 utilizing the three temporally pumps in addition to the pump which started first.

To add one more temporally pump, we temporarily stopped the three temporally pumps at 12:07 pm. The pump which started first is still under operation.

Press Release (Apr 06,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.4)

This is follow-up information regarding the water leak from the underground reservoir No. 2 in Fukushima Daiichi NPS.

At 5:43 am on April 6, we started transferring the water from the underground reservoir No. 2 to the underground reservoir No. 1. In addition, we started operation of the additional three temporally pumps at 9:38 am.

At 9:41 am, we conducted an on-site survey and confirmed that there is no abnormality such as leakage on the transferring line.

Press Release (Apr 06,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.3)

This is follow-up information regarding the water leak from the underground reservoir No. 2 in Fukushima Daiichi NPS.

At 5:43 am on April 6, we started transferring the water from the underground reservoir No. 2 to the underground reservoir No. 1. In addition, we will install three temporally pumps and will start operation soon after these are ready.

Press Release (Apr 06,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.2)

This is follow-up information regarding the water leak from the underground reservoir No. 2 in Fukushima Daiichi NPS.

At 5:43 am on April 6, we started transferring the water from the underground reservoir No. 2 to the underground reservoir No. 1.

At 5:43, we conducted an on-site survey and confirmed that there is no abnormality such as leakage on the transferring line.

We assume that amount of the leaked water is approx. 120 m³, the whole γ radioactive concentration is approx. 1.5 x 10⁰ (Bq/cm³), the whole β radioactive concentration is approx. 5.9 x 10³ (Bq/cm³), the whole amount ofγradioactivity is approx. 1.8 x 10⁸ (Bq) and the whole amount of β radioactivity is approx. 7.1 x 10¹¹ (Bq). We are conducting further investigations on this matter.

We judged that this incident can be applied mutatis mutandis pursuant to Paragraph 10 of Article 19 (17) of Regulations Concerning the Installment, Operation, etc. of Reactors that stipulates "when radioactive material leakage found in controlled area due to accident or other contingency situations" at 5:10 am on April 6, even though it is occurred outside of the controlled area.

Therefore, this report has been issued in accordance with the Article 168 of Safety Standard for Nuclear Facilities of Fukushima Daiichi Nuclear Power Station (Reports).

Press Release (Apr 06,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station (Follow-up Information)

This is follow-up information regarding the water leak from the underground reservoir No. 2 in Fukushima Daiichi NPS.

We are planning to transfer the water in the underground reservoir No.2 to the underground reservoir No.1 soon after it is ready.

Approximately 13,000 m³ (operational limit) of water is accumulated in the underground reservoir No.2 (Capacity: approximately 14,000 m³) and approximately 11,500 m³ (operational limit) of the water will be transferred to the underground reservoir No.1 (Capacity: approximately 13,000 m³).

We assume that there is no leakage to the ocean since there is no drainage ditch near the reservoir.

Press Release (Apr 05,2013)Water Leak from the Underground Reservoir No.2 in Fukushima Daiichi Nuclear Power Station

On April 3, order of 10¹ (Bq/cm³) of radioactive concentration was detected as a result of a water quality analysis of the water between the outermost sheet (bentonite sheet) of three layered sheets and the ground in the underground reservoir No.2.

Therefore, we conducted a water quality analysis of the water between the outermost sheet (bentonite sheet) and the inner sheet (two layered water shielding sheet) today (April 5) and detected approximately 10⁶ (Bq/cm³) of radioactive concentration.

We will conduct additional water quality analysis tomorrow (April 6).

Now we are investigating this incident.