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March 17, 2011

Status of Fukushima power plant

Status of Japanese Fukushima Daiichi power plant

The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office

As of 10:15AM (EST), March 17, 2011

Radiation Levels
o At 9:20AM (JST) on March 17, radiation level at elevation of 1,000ft above Fukushima Daiichi Nuclear Power Station: 4,130 micro sievert.
o At 9:20AM on March 17, radiation level at elevation of 300ft above Fukushima Daiichi Nuclear Power Station: 87,700 micro sievert.
o At 11:10AM on March 17, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 646.2 micro sievert.
o At 7:50PM on March 17, radiation level outside main office building (approximately 1,640 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 3,599 micro sievert.
o For comparison, a human receives 2,400 micro sievert per year from natural radiation in the form of sunlight, radon, and other sources. One chest CT scan generates 6,900 micro sievert per scan.


Fukushima Daiichi Unit 1 reactor
o Since 10:30AM on March 14, the pressure within the primary containment vessel cannot be measured.
o At 12:50PM on March 17, pressure inside the reactor core: 0.185MPa.
o At 12:50PM on March 17, water level inside the reactor core: 1.7 meters below the top of the fuel rods.


Fukushima Daiichi Unit 2 reactor
o At 12:25PM on March 16, pressure inside the primary containment vessel: 0.40MPaabs.
o At 12:50PM on March 17, pressure inside the reactor core: -0.027MPa.
o At 12:50PM on March 17, water level inside the reactor core: 1.8 meters below the top of the fuel rods.

Fukushima Daiichi Unit 3 reactor

o At 12:40PM on March 16, pressure inside the primary containment vessel: 0.23MPaabs.
o At 6:15AM on March 17, pressure inside the suppression chamber was observed to fluctuate.
o At 7:00AM on March 17, pressure inside the suppression chamber: 0.22MPa.
o At 7:05AM on March 17, pressure inside the suppression chamber: 0.44MPa.
o At 7:10AM on March 17, pressure inside the suppression chamber: 0.26MPa.
o At 7:15AM on March 17, pressure inside the suppression chamber: 0.52MPa.
o At 7:20AM on March 17, pressure inside the suppression chamber: 0.13MPa.
o At 7:25AM on March 17, pressure inside the suppression chamber: 0.57MPa.
o At 9:48AM on March 17, a Self Defense Forces helicopter made four water drops aimed for the spent fuel pool.
o At 4:35PM on March 17, pressure inside the reactor core: 0.005MPa.
o At 4:35PM on March 17, water level inside the reactor core: 1.95 meters below the top of the fuel rods.
o At 7:05PM on March 17, a police water cannon began to shoot water aimed at the spent fuel pool until 7:22PM.
o At 7:35PM on March 17, five Self Defense Forces emergency fire vehicles shot water aimed at the spent fuel pool, until 8:09PM.


Fukushima Daiichi Unit 5 reactor

o At 2:00PM on March 16, the temperature of the spent fuel pool was measured at 145 degrees Fahrenheit.


Fukushima Daiichi Unit 6 reactor
o At 2:00PM on March 16, the temperature of the spent fuel pool was measured at 140 degrees Fahrenheit.

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