FEPC Update to Information Sheet Regarding the Tohoku Earthquake 4/13

Update to Information Sheet Regarding the Tohoku Earthquake

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

As of 9:30AM (EST), April 13, 2011

• 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 1:50PM on April 12  (a)	Sampled at south side discharge point at 2:00PM on April 12  (b)	Maximum Permissible Water Concentration (c)	a / c	b / c
I-131 (8 days)	1.0 x 102	1.3 x 100	4.0 x 10-2	2,500	33
Cs-134 (2 years)	8.3 x 101	1.4 x 100	6.0 x 10-2	1,400	23
Cs-137 (30 years)	8.4 x 101	1.4 x 100	9.0 x 10-2	930	16

• At 4:00PM (JST) on April 13, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 76 micro Sv/hour.
• At 4:00PM on April 13, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 39.2 micro Sv/hour.
• Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 1:00PM on April 13 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)	0.420	-0.016	-0.023	-	0.003	0.019
	4/13 12:00PM	4/13 12:00PM	4/13 12:10PM	-	4/13 1:00PM	4/13 1:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)	0.190	0.095	0.1036	-	-	-
	4/13 12:00PM	4/13 12:00PM	4/13 12:10PM	-	-	-
water level inside the reactor core (meter) *1	-1.6	-1.5	-1.75	-	+1.59	+2.365
	4/13 12:00PM	4/13 12:00PM	4/13 12:10PM	-	4/13 1:00PM	4/13 1:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)	400.1 *2	332.4	198.0 *2	-	-	-
	4/13 12:00PM	4/13 12:00PM	4/13 12:10PM	-	-	-
temperature of the spent fuel pool (degrees Fahrenheit)	-	113	-	-	95.2	73.4
	-	4/13 12:00PM	-	-	4/13 1:00PM	4/13 1:00PM
the temperature directly above the spent fuel pool by thermography measurement (degrees Fahrenheit)	78.8	-	138.2	98.6	-	-
	4/12 7:50AM	-	4/12 7:50AM	4/12 7:50AM	-	-
temperature directly above the primary containment vessel by thermography measurement (degrees Fahrenheit)	62.6	-	69.8	-	-	-
	4/12 7:50AM	-	4/12 7:50AM	-	-	-
temperature directly above the second containment building  by thermography measurement (degrees Fahrenheit)	-	82.4	-	-	-	-
	-	4/12 7:50AM	-	-	-	-
Amount of water in total shot/injected to the spent fuel storage pool (tons)	90	359 - 374	5,238	1,816	-	-
	as of 4/13 5:00PM	as of 4/13 5:00PM	as of 4/13 5:00PM	as of 4/13 5:00PM	-	-

*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 12:00PM on April 13, injection of nitrogen gas into the primary containment vessel to prevent an explosion by accumulated hydrogen gas continues.
• As of 12:00PM on April 13, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 2 reactor
• At 7:35PM on April 12, transferring of the accumulated water at the trench (concrete tunnel which houses pipes and cables) outside the turbine building to the condenser commenced.
• At 1:15PM on April 13, TEPCO began to inject freshwater into the spent fuel pool, until 2:55PM.
• As of 12:00PM on April 13, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 3 reactor
• As of 12:00PM on April 13, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 4 reactor
• At 12:30AM on April 13, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete, until 6:57PM (approximately 195 tons in total).
• Fukushima Daiichi Common Spent Fuel Pool
• At 8:00AM on April 13, the temperature of the spent fuel pool: 84.2 degrees Fahrenheit.
• Others

• At 1:00PM on April 12 and at 10:00AM on April 13, TEPCO installed steel plates at the ocean side of the screen device of Unit 2 in order to contain the spread of discharged radioactive water.
• At 1:50PM on April 13, TEPCO installed a silt fence at the ocean side of the screen device of Unit 3 and 4 in order to contain the spread of discharged radioactive water.

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

+++++++++++++++++++++++++++++++++