Friday, April 8, 2011

FEPC Update to Information Sheet Regarding Tohoku Earthquake 4/08

Update to Information Sheet Regarding the Tohoku Earthquake
The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office
As of 12:00PM (EST), April 8, 2011


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/

  • Radiation Levels
    • The concentration of radioactive nuclides from the seawater sampled at the screen device (installed to remove waste before the intake of seawater) of Unit 2 and sampled near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station were as follows:

Nuclides
(half-life)
Concentration (Unit : Bq/cm3)
Ratio
Sampled at the screen of Unit 2 at 7:45AM on April 7  (a)
Sampled at south side discharge point at 2:00PM on April 7  (b)
Maximum Permissible Water Concentration (c)
a / c
b / c
I-131
(8 days)
2.5 x 103
1.7 x 100
4.0 x 10-2
63,000
43
Cs-134
(2 years)
1.5 x 103
1.8 x 100
6.0 x 10-2
25,000
30
Cs-137
(30 years)
1.5 x 103
1.8 x 100
9.0 x 10-2
17,000
20

    • At 7:00PM (JST) on April 8, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 94 micro Sv/hour.
    • At 7:00PM on April 8, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 53.4 micro Sv/hour.
    • Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on April 8 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.

  • Plant Parameters

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
pressure inside the reactor core (gauge pressure, MPa)
0.395
-0.020
-0.004
-
0.003
0.005
4/8
12:00PM
4/8
12:00PM
4/8
12:00PM
-
4/8
2:00PM
4/8
2:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)
0.185
0.100
0.1052
-
-
-
4/8
13:00PM
4/8
12:00PM
4/8
12:00PM
-
-
-
water level inside the reactor core (meter) *1
-1.65
-1.5
-1.85
-
+1.644
+1.668
4/8
12:00PM
4/8
12:00PM
4/8
12:00PM
-
4/8
2:00PM
4/8
2:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)
475.9
*2
286.2
191.8
*2
-
-
-
4/8
1:00PM
4/8
12:00PM
4/8
12:00PM
-
-
-
temperature of the spent fuel pool (degrees Fahrenheit)
-
127.4
-
-
94.5
86.9
-
4/8
12:00PM
-
-
4/8
2:00PM
4/8
2:00PM
the temperature directly above the spent fuel pool by thermography measurement (degrees Fahrenheit)
73.4
-
132.8
114.8
-
-
4/8
7:30AM
-
4/8
7:30AM
4/8
7:30AM
-
-
temperature directly above the primary containment vessel by thermography measurement (degrees Fahrenheit)
91.4
-
95
-
-
-
4/8
7:30AM
-
4/8
7:30AM
-
-
-
temperature directly above the second containment building  by thermography measurement (degrees Fahrenheit)
-
86
...

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Michele Kearney

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- Show quoted text -
---------- Forwarded message ----------
From: Dan Yurman <djysrv@usa.net>
Date: Fri, Apr 8, 2011 at 3:41 PM
Subject: [SocialMedia] FEPC Fukushima Reactor Update for April 8, 2011
To: Social Media <socialmedia@list.ans.org>

- Show quoted text -
Update to Information Sheet Regarding the Tohoku Earthquake
The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office
As of 12:00PM (EST), April 8, 2011

 
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/

  • Radiation Levels
    • The concentration of radioactive nuclides from the seawater sampled at the screen device (installed to remove waste before the intake of seawater) of Unit 2 and sampled near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station were as follows:

Nuclides
(half-life)
Concentration (Unit : Bq/cm3)
Ratio
Sampled at the screen of Unit 2 at 7:45AM on April 7  (a)
Sampled at south side discharge point at 2:00PM on April 7  (b)
Maximum Permissible Water Concentration (c)
a / c
b / c
I-131
(8 days)
2.5 x 103
1.7 x 100
4.0 x 10-2
63,000
43
Cs-134
(2 years)
1.5 x 103
1.8 x 100
6.0 x 10-2
25,000
30
Cs-137
(30 years)
1.5 x 103
1.8 x 100
9.0 x 10-2
17,000
20

    • At 7:00PM (JST) on April 8, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 94 micro Sv/hour.
    • At 7:00PM on April 8, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 53.4 micro Sv/hour.
    • Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on April 8 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.

  • Plant Parameters
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
pressure inside the reactor core (gauge pressure, MPa)
0.395
-0.020
-0.004
-
0.003
0.005
4/8
12:00PM
4/8
12:00PM
4/8
12:00PM
-
4/8
2:00PM
4/8
2:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)
0.185
0.100
0.1052
-
-
-
4/8
13:00PM
4/8
12:00PM
4/8
12:00PM
-
-
-
water level inside the reactor core (meter) *1
-1.65
-1.5
-1.85
-
+1.644
+1.668
4/8
12:00PM
4/8
12:00PM
4/8
12:00PM
-
4/8
2:00PM
4/8
2:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)
475.9
*2
286.2
191.8
*2
-
-
-
4/8
1:00PM
4/8
12:00PM
4/8
12:00PM
-
-
-
temperature of the spent fuel pool (degrees Fahrenheit)
-
127.4
-
-
94.5
86.9
-
4/8
12:00PM
-
-
4/8
2:00PM
4/8
2:00PM
the temperature directly above the spent fuel pool by thermography measurement (degrees Fahrenheit)
73.4
-
132.8
114.8
-
-
4/8
7:30AM
-
4/8
7:30AM
4/8
7:30AM
-
-
temperature directly above the primary containment vessel by thermography measurement (degrees Fahrenheit)
91.4
-
95
-
-
-
4/8
7:30AM
-
4/8
7:30AM
-
-
-
temperature directly above the second containment building  by thermography measurement (degrees Fahrenheit)
-
86
-
-
-
-
-
4/8
7:30AM
-
-
-
-
Amount of water in total shot/injected to the spent fuel storage pool (tons)
90
299 - 314
5,048
1,531
-
-
as of 4/8
7:00PM
as of 4/8
7:00PM
as of 4/8
7:00PM
as of 4/8
7:00PM
-
-
*1: Minus figure means that water level is below the top of the fuel rods.
*2: This figure is under investigation.

  • Fukushima Daiichi Unit 1 reactor
    • As of 6:00PM on April 8, injection of nitrogen gas into the primary containment vessel to prevent an explosion by accumulated hydrogen gas continues.
    • As of 6:00PM on April 8, the injection of freshwater into the reactor core continues.
  • Fukushima Daiichi Unit 2 reactor
    • As of 6:00PM on April 8, the injection of freshwater into the reactor core continues.
  • Fukushima Daiichi Unit 3 reactor
    • At 5:08PM on April 8, TEPCO began to shoot water aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete.
    • As of 6:00PM on April 8, the injection of freshwater into the reactor core continues.
  • Fukushima Daiichi Common Spent Fuel Pool
    • At 7:20AM on April 8, the temperature of the spent fuel pool: 82.4 degrees Fahrenheit.
 
     Others
  • Fukushima Daiichi Nuclear Power Station
    • As of 4:00PM on April 8, no significant changes have been detected at monitoring posts at the site.
  • Fukushima Daini Nuclear Power Station (Unit 1, 2, 3 & 4)
    • Plant operation was suspended at all units when the aftershock occurred.
    • As of 4:00PM on April 8, no significant changes have been detected at monitoring posts at the site.
  • Onagawa Nuclear Power Station (Unit 1,2 & 3)
    • Plant operation was suspended at all units when the aftershock occurred.
    • The spent fuel pool cooling system was suspended automatically but has been recovered immediately.
    • As of 4:00PM on April 8, no significant changes have been detected at monitoring posts at the site.
  • Higashidori Nuclear Power Station
    • Plant was under periodical maintenance when the aftershock occurred.
    • Immediately after the external power was lost, backup diesel generators turned on to supply electricity to maintain the cooling system of the spent fuel storage pool.
    • As of 4:00PM on April 8, no significant changes have been detected at monitoring posts at the site.
  • Tokai Daini Nuclear Power Station
    • Plant operation was suspended when the aftershock occurred.
    • As of 4:00PM on April 8, no abnormality has been reported.
  • Tomari Nuclear Power Station (Unit 1, 2 & 3)
    • All units were under normal operation when the aftershock occurred.
    • As of 4:00PM on April 8, all units are under normal operation.
  • Rokkasho Reprocessing Plant and Accompanying Facilities
    • Immediately after the external power was lost, backup diesel generators turned on to supply electricity..
    • As of 5:00PM on April 8, power supply has been switched from backup power generation systems to the external power. It was confirmed that no fire, damage to equipment, injuries to personnel occurred. Radiation levels were measured at a normal level of safety.

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)


++++++++++++++++++++++++++++++++
Taro Ishida
The Federation of Electric Power Companies of Japan
1901 L Street, NW Suite 600
Washington, DC 20036
Mobile (202) 253-2579
Phone (202) 530-0769 (Direct)
Phone (202) 466-6781
Fax (202) 466-6758
email: ishida@denjiren.com
at

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