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), April 1, 2011
· Radiation Levels
o On March 31, TEPCO announced that radioactive nuclides were detected from the groundwater sampled around the turbine buildings of Fukushima Daiichi Nuclear Station on March 30. The results of the analysis are as follows:
Nuclides (half-life) | Concentration (Unit : Bq/cm3) | ||||
Unit 1 | Unit 2 | Unit 3 | Unit 5 | Unit 6 | |
I-131 (8 days) | 4.3 x 102 | 8.0 x 101 | 2.2 x 101 | 1.6 x 100 | 2.0 x 101 |
I-132 (2 hours) | 8.3 x 100 | UDL | 1.3 x 101 | UDL | 5.8 x 10-1 |
Cs-134 (2 years) | 5.2 x 100 | 7.0 x 10-1 | 1.0 x 101 | 2.5 x 10-1 | 4.7 x 100 |
Cs-136 (13 days) | 3.9 x 10-1 | 6.5 x 10-2 | 9.4 x 10-1 | 2.7 x 10-2 | 3.9 x 10-1 |
Cs-137 (30 years) | 5.9 x 100 | 6.3 x 10-1 | 1.0 x 101 | 2.7 x 10-1 | 4.9 x 100 |
UDL: under the detection limit
o At 7:00PM (JST) on April 1, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 141 micro Sv/hour.
o At 7:00PM on April 1, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 90.0 micro Sv/hour.
o Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on April 1 are shown in the attached PDF file. English version is available at: http://www.mext.go.jp/
o For comparison, a human receives 2,400 micro Sv per year from natural radiation in the form of sunlight, radon, and other sources. One chest CT scan generates 6,900 micro Sv per scan.
· Fukushima Daiichi Unit 1 reactor
o At 10:00AM on April 1, pressure inside the reactor core: 0.295MPa.
o At 10:00AM on April 1, water level inside the reactor core: 1.65 meters below the top of the fuel rods.
o At 10:00AM on April 1, pressure inside the primary containment vessel: 0.165MPaabs.
o At 10:00AM on April 1, the temperature of the reactor vessel measured at the water supply nozzle: 479.5 degrees Fahrenheit.
o As of 3:30PM on April 1, the injection of freshwater into the reactor core continues.
o As of 7:00PM on April 1, preparation to recover and transfer the accumulated water at the turbine building continues.
o As of 7:00PM on April 1, approximately 90 tons of water in total has been injected into the spent fuel storage pool.
· Fukushima Daiichi Unit 2 reactor
o At 10:00AM on April 1, the temperature of the spent fuel pool: 122 degrees Fahrenheit.
o At 10:00AM on April 1, pressure inside the reactor core: -0.007MPa.
o At 10:00AM on April 1, water level inside the reactor core: 1.5 meters below the top of the fuel rods.
o At 10:00AM on April 1, pressure inside the primary containment vessel: 0.11MPaabs.
o As of 3:30PM on April 1, the injection of freshwater into the reactor core continues.
o As of 7:00PM on April 1, preparation to recover and transfer the accumulated water at the turbine building continues.
· Fukushima Daiichi Unit 3 reactor
o At 4:30PM on March 31, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete, until 7:33PM (approximately 105 tons in total).
o At 11:45AM on April 1, pressure inside the reactor core: 0.016MPa.
o At 11:45AM on April 1, water level inside the reactor core: 1.9 meters below the top of the fuel rods.
o At 11:45AM on April 1, pressure inside the primary containment vessel: 0.1068MPaabs.
o As of 3:30PM on April 1, the injection of freshwater into the reactor core continues.
o As of 7:00PM on April 1, preparation to recover and transfer the accumulated water at the turbine building continues.
o As of 7:00PM on April 1, approximately 4,802 tons of water in total has been shot into the spent fuel storage pool.
· Fukushima Daiichi Unit 4 reactor
o At 8:28AM on April 1, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete, until 2:14PM (approximately 180 tons in total).
o As of 7:00PM on April 1, approximately 1,278 tons of water in total has been shot into the spent fuel storage pool.
· Fukushima Daiichi Unit 5 reactor
o At 2:00PM on April 1, the temperature of the spent fuel pool: 100.6 degrees Fahrenheit.
· Fukushima Daiichi Unit 6 reactor
o At 2:00PM on April 1, the temperature of the spent fuel pool: 69.8 degrees Fahrenheit.
· Fukushima Daiichi Common Spent Fuel Pool
o At 7:30AM on April 1, the temperature of the spent fuel pool: 89.6 degrees Fahrenheit.
· Others
o At 3:42PM on March 31, a US Military barge carrying freshwater docked at the dedicated port at Fukushima Daiichi Nuclear Power Station, towed by a vessel of Marine Self Defense Forces.
o At 3:00PM on April 1, anti-scattering agent was dispersed on a trial basis around the Fukushima Daiichi Common Spent Fuel Pool.
o At 3:58PM on April 1, transferring the freshwater from the US Military barge to a filtrate tank commenced.
· From: Taro Ishida [ishida@denjiren.com]
Sent: 04/01/2011 11:43 AM AST
To: Taro Ishida <ishida@denjiren.com>
Cc: Samuel Lederer <lederer@denjiren.com>
Subject: Information Sheet Regarding the Tohoku Earthquake (from FEPC Washington Office)
Sent: 04/01/2011 11:43 AM AST
To: Taro Ishida <ishida@denjiren.com>
Cc: Samuel Lederer <lederer@denjiren.com>
Subject:
Dear Friends,
Please find the updated information sheet below and attached that summarizes the events from Update-17 at 11:00AM on 3/31.
For your reference, JAIF (Japan Atomic Industrial Forum) has been posting the translation of news reports on their website.
Please direct any questions regarding this document to me, Ishida@denjiren.com or Samuel Lederer, Researcher of FEPC at lederer@denjiren.com.
Our official sources are:
- Office of The Prime Minister of Japan
- Nuclear and Industrial Safety Agency (NISA)
- Tokyo Electric Power Company (TEPCO) Press Releases
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
Dan Yurman
Email: dan.yurman@usa.net
Mobile: 208-521-5726
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