Thursday, March 31, 2011

Fukushima reactor status news for 2011 03 31

(NucNet from World Nuclear Organization did not publish this morning)

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

As of 11:00AM (EST), March 31, 2011

  • Radiation Levels
    • At 8:51AM (JST) on March 31, it was announced that radioactive nuclide I-131  was detected from the seawater sampled near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station at 1:55PM on March 30. The level of concentration was approximately 4,385 times higher than the maximum permissible water concentration set by the government.
    • At 2:00PM on March 31, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 157 micro Sv/hour.
    • At 2:00PM on March 31, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 99.9 micro Sv/hour.
    • Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on March 31 are shown in the attached PDF file. English version is available at: http://www.mext.go.jp/english/radioactivity_level/detail/1304082.htm
    • 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
    • At 8:00AM on March 31, pressure inside the reactor core: 0.329MPa.
    • At 8:00AM on March 31, water level inside the reactor core: 1.65 meters below the top of the fuel rods.
    • At 8:00AM on March 31, pressure inside the primary containment vessel: 0.21MPaabs.
    • At 8:00AM on March 31, the temperature of the reactor vessel measured at the water supply nozzle: 480.9 degrees Fahrenheit
    • At 9:20AM on March 31, transferring of the accumulated water at the trench (concrete tunnel which houses pipes and cables) outside the turbine building commenced, until 11:25AM. As a result, the water level at the trench was reduced from 0.14 meters to 1.14 meters below the top of the trench.
    • At 1:03PM on March 31, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete.
    • As of 3:00PM on March 31, the injection of freshwater into the reactor core continues.
    • As of 3:00PM on March 31, preparation to recover and transfer the accumulated water at the turbine building continues.
  • Fukushima Daiichi Unit 2 reactor
    • As of 3:00PM on March 29, the water level at the trench was 1.04 meters below the top of the trench.
    • At 8:00AM on March 31, the temperature of the spent fuel pool: 131 degrees Fahrenheit.
    • At 8:00AM on March 31, pressure inside the reactor core: -0.016MPa.
    • At 8:00AM on March 31, water level inside the reactor core: 1.5 meters below the top of the fuel rods.
    • At 8:00AM on March 31, pressure inside the primary containment vessel: 0.11MPaabs.
    • As of 3:00PM on March 31, the injection of freshwater into the reactor core continues.
    • As of 3:00PM on March 31, approximately 96 tons of water in total has been injected into the spent fuel storage pool.
    • As of 3:00PM on March 31, preparation to recover and transfer the accumulated water at the turbine building continues.
  • Fukushima Daiichi Unit 3 reactor
    • As of 3:00PM on March 29, the water level at the trench was 1.55 meters below the top of the trench.
    • At 9:40AM on March 31, pressure inside the reactor core: 0.016MPa.
    • At 9:40AM on March 31, water level inside the reactor core: 1.85 meters below the top of the fuel rods.
    • At 9:40AM on March 31, pressure inside the primary containment vessel: 0.1066MPaabs.
    • As of 3:00PM on March 31, the injection of freshwater into the reactor core continues.
    • As of 3:00PM on March 31, approximately 4,697 tons of water in total has been shot to the spent fuel storage pool.
    • As of 3:00PM on March 31, preparation to recover and transfer the accumulated water at the turbine building continues.
  • Fukushima Daiichi Unit 4 reactor
    • As of 3:00PM on March 31, approximately 1,098 tons of water in total has been shot to the spent fuel storage pool.
  • Fukushima Daiichi Unit 5 reactor
    • At 11:00AM on March 31, the temperature of the spent fuel pool: 86 degrees Fahrenheit.
  • Fukushima Daiichi Unit 6 reactor
    • At 11:00AM on March 31, the temperature of the spent fuel pool: 78.8 degrees Fahrenheit.
  • Fukushima Daiichi Common Spent Fuel Pool
    • At 8:20AM on March 30, the temperature of the spent fuel pool: 89.6 degrees Fahrenheit.
    • As of 3:00PM on March 31, approximately 130 tons of water in total has been injected to the spent fuel storage pool.

From: Taro Ishida [ishida@denjiren.com]
  Sent: 03/31/2011 11:22 AM AST
  To: Taro Ishida <ishida@denjiren.com>
  Cc: Samuel Lederer <lederer@denjiren.com>
  Subject: <Update-17> Information Sheet Regarding the Tohoku Earthquake (from FEPC Washington Office)

Dear Friends,

Please find the updated information sheet below and attached that summarizes the events from Update-15 at 10:00AM on 3/30.

For your reference, JAIF (Japan Atomic Industrial Forum) has been posting the translation of news reports on their website.

http://www.jaif.or.jp/english/

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)

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