Update to Information Sheet Regarding the Tohoku Earthquake
The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office
As of 11:00AM (EST), March 15, 2011
· Radiation Levels
o At 10:22AM (JST) on March 15, a radiation level of 400 milli sievert per hour was recorded outside secondary containment building of the Unit 3 reactor at Fukushima Daiichi Nuclear Power Station.
o At 3:30PM on March 15, a radiation level of 596 micro sievert per hour was recorded at the main gate of Fukushima Daiichi Nuclear Power Station.
o At 4:30PM on March 15, a radiation level of 489 micro sievert per hour was recorded on the site of the Fukushima Daiichi Nuclear Power Station.
o For comparison, a human receives 2400 micro sievert per year from natural radiation in the form of sunlight, radon, and other sources. One chest CT scan generates 6900 micro sievert per scan.
· Fukushima Daiichi Unit 1 reactor
o As of 10:00PM on March 14, the pressure inside the reactor core was measured at 0.05 MPa. The water level inside the reactor was measured at 1.7 meters below the top of the fuel rods.
· Fukushima Daiichi Unit 2 reactor
o At 6:14AM on March 15, an explosion was heard in the secondary containment building. TEPCO assumes that the suppression chamber, which holds water and stream released from the reactor core, was damaged.
o At 1:00PM on March 15, the pressure inside the reactor core was measured at 0.608 MPa. The water level inside the reactor was measured at 1.7 meters below the top of the fuel rods.
· Fukushima Daiichi Unit 3 reactor
o At 6:14AM on March 15, smoke was discovered emanating from the damaged secondary containment building.
· Fukushima Daiichi Unit 4 reactor
o At 9:38AM on March 15, a fire was discovered on the third floor of the secondary containment building.
o At 12:29PM on March 15, TEPCO confirmed extinguishing of the fire.
· Fukushima Daini Unit 1 reactor
o At 7:00PM on March 14, TEPCO confirmed cold shutdown.
o As of 12:00AM on March 16, TEPCO continues to cool the reactor core.
· Fukushima Daini Unit 2 reactor
o At 7:00PM on March 14, TEPCO confirmed cold shutdown.
o As of 12:00AM on March 16, TEPCO continues to cool the reactor core.
· Fukushima Daini Unit 3 reactor
o At 12:15PM on March 14, cold shutdown.
o As of 12:00AM on March 16, TEPCO continues to cool the reactor core.
· Fukushima Daini Unit 4 reactor
o At of 7:15AM on March 15, cold shutdown.
o As of 12:00AM on March 16, TEPCO continues to cool the reactor core.
From: Taro Ishida [ishida@denjiren.com]Sent: 03/15/2011 11:09 AM AST
To: Taro Ishida <ishida@denjiren.com>
Subject:
Dear Friends,
Please find the updated information sheet below and attached that summarizes the events of the past few days in Japan and the continuing efforts to mitigate the incident at Fukushima Daiichi Nuclear Power Station.
As for Update-1 which I sent on 3/14, we have corrected some of the first “radiation level” part to more accurate expressions.
I’ve attached the revised version of Update-1 as well. I apologize for any inconvenience caused.
Please direct any questions regarding this document to me, Taro Ishida or Samuel Lederer, Researcher of FEPC at lederer@denjiren.com or call 202-466-6781.
Taro Ishida
The Federation of Electric Power Companies of Japan (FEPC)
1901 L Street NW, Suite 600
Washington, DC 20036
Tel: 202-466-6781
Taro Mobile: 202-253-2579
Dan Yurman
Email: djysrv@gmail.com
Blog: ANS Nuclear Cafe Twitter: @djysrv
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