Today at approximately 2:46PM, turbines and reactors of Tokyo Electric
Power Company's Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling
Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling
Water Reactor, Rated Output 784 Megawatts) that had been operating at
rated power automatically shutdown due to the Miyagiken-oki Earthquake.
For the above 3 units, off-site power was lost due to malfunction of one
out of two off-site power system, leading to automatic startup of
emergency diesel generators.
Subsequently, at 3:41PM, emergency diesel generators shutdown due to
malfunction resulting in the complete loss of alternating current for
all three units.
Hence, at 3:42PM, it was decided that a specific incident stipulated
in Article 10, Clause 1 of the Act on Special Measures Concerning
Nuclear Emergency Preparedness*1 has occurred and a "First Level Emergency"
was declared and in accordance with the aforementioned Act, the Minister
of Economy, Trade, and Industry, the Governor of Fukushima Prefecture,
the Mayor of Okuma Town, and the Mayor of Futaba Town along with other
involved organizations were notified of the incident.
TEPCO is taking steps to determine the exact cause behind the shutdown
of the emergency diesel generators and is working towards their restoration.
The exhaust pipe's monitor reading indicates that radiation levels have
remained unchanged and presently there have been no confirmed radioactivity
impact to external environment. Further details are in the process of
*1 Specific Incident Stipulated in Article 10, Clause 1 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness
The objective of the Act on Special Measures Concerning Nuclear Emergency
Preparedness is to protect the welfare, physical wellbeing and property
of Japan's citizens. To this end, when accidents and equipment breakdown
have reached certain levels at nuclear power plants, the Act obligates
us to notify the nation, prefectures, cities and towns in order for them
to take necessary actions and to grasp information in a timely manner.
Notifications are issued out under circumstances such as when the nuclear
reactor cannot be shut down and/or when the water supply to the reactor
is cut off.