FEPC Update to Information Sheet Regarding the Tohoku Earthquake 5/6

Please find the updated information sheet below and attached that summarizes the events from Update-40 at  11:40AM on 5/5.

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.

Update to Information Sheet Regarding the Tohoku Earthquake

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

As of 09:00PM (EST), May 6, 2011

All times listed below are Japan Standard Time (JST) unless otherwise noted.

• 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 inside the silt  fence at the screen of Unit 2	Sampled outside the silt fence at the screen of Unit 2	Sampled at south side discharge point	Maximum Permissible Water Concentration (d)	a / d	b / d	c / d
	5/5 7:30AM   (a)	5/5 7:20AM (b)	5/5 2:10PM (c)
I-131 (8 days)	9.4 x 100	3.9 x 100	7.7 x 10-3	4.0 x 10-2	240	98	0.19
Cs-134 (2 years)	3.7 x 100	3.9 x 100	6.3 x 10-2	6.0 x 10-2	62	65	1.1
Cs-137 (30 years)	3.7 x 100	4.0 x 100	7.1 x 10-2	9.0 x 10-2	41	44	0.79

• At 2:00PM on May 6, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 46 micro Sv/hour.
• At 2:00PM on May 6, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 18.7 micro Sv/hour.
• Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 10:00AM on May 6 are shown in the attached PDF file. English version is available at:    http://www.mext.go.jp/english/incident/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)	0.465	-0.020	-0.079	-	0.006	0.016
	5/6 11:00AM	5/6 11:00AM	5/6 11:00AM	-	5/6 13:00PM	5/6 13:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)	0.130	0.065	0.1043	-	-	-
	5/6 11:00AM	5/6 11:00AM	5/6 11:00AM	-	-	-
water level inside the reactor core (meter) *1	-1.65	-1.5	-2.1	-	+1.967	+2.286
	5/6 11:00AM	5/6 11:00AM	5/6 11:00AM	-	5/6 13:00PM	5/6 13:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)	273.4	241.5	326.3	-	-	-
	5/6 11:00AM	5/6 11:00AM	5/6 11:00AM	-	-	-
temperature of the spent fuel pool (degrees Fahrenheit)	-	158.0	-	-	101.7	84.2
	-	5/6 11:00AM	-	-	5/6 13:00PM	5/6 13:00PM
Amount of water in total shot/injected to the spent fuel storage pool (tons)	90	697 - 712	5,390.5	3,306.2	-	-
	as of 5/5 5:00PM	as of 5/5 5:00PM	as of 5/5 5:00PM	as of 5/5 5:00PM	-	-

*1: A negative figure indicates that the water level is below the top of the fuel rods.

• Fukushima Daiichi Unit 1 reactor
• At 4:36PM on May 5, TEPCO began operating six air circulators which have been installed at the turbine building in order to reduce the radioactive concentration of the reactor building.
• At 10:01AM on May 6, TEPCO began to increase the injection volume of freshwater into the reactor core from 6m³ /hour to 8m³ /hour in order to flood the primary containment vessel to the level at which the fuel in the reactor can be fully submerged for cold shutdown of  the reactor.
• As of 3:00PM on May 6, injection of nitrogen gas into the primary containment vessel to prevent an explosion by accumulated hydrogen gas continues.
• As of 3:00PM on May 6, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 2 reactor
• At 9:36AM on May 6, TEPCO began to inject freshwater into the spent fuel pool, until 11:16AM (approximately 58 tons in total).
• As of 3:00PM on May 6, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 3 reactor
• As of 3:00PM on May 6, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 4 reactor
• At 12:38PM on May 6, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete.
• Fukushima Daiichi Unit 6 reactor
• At 2:00PM on May 6, transferring of the accumulated water at the turbine building to the temporary tank commenced.
• Fukushima Daiichi Common Spent Fuel Pool
• As of 6:30AM on May 6, the temperature of the spent fuel pool: 77.0 degrees Fahrenheit.
•  Others
• On May 6, TEPCO dispersed dust suppressant around the reactor building of Unit 1 in order to prevent diffusion of radioactive materials.

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)
• Ministry of Defense (MOD)

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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

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