Update to Information Sheet Regarding the Tohoku Earthquake 5/4

Update to Information Sheet Regarding the Tohoku Earthquake

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

As of 10:00AM (EST), May 4, 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
	5/3 6:50AM   (a)	5/3 6:46AM (b)	5/3 1:40PM (c)
I-131 (8 days)	5.6 x 101	4.1 x 100	Not Detectable	4.0 x 10-2	1,400	100	-
Cs-134 (2 years)	4.4 x 100	2.3 x 100	4.8 x 10-2	6.0 x 10-2	73	38	0.8
Cs-137 (30 years)	4.5 x 100	2.4 x 100	5.9 x 10-2	9.0 x 10-2	50	27	0.66

• At 2:00PM on May 4, 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 4, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 19.1 micro Sv/hour.
• Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 1:00PM on May 4 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)	0.450	-0.020	-0.077	-	0.003	0.016
	5/4 11:00AM	5/4 11:00AM	5/4 11:00AM	-	5/4 12:00PM	5/4 12:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)	0.135	0.065	0.1033	-	-	-
	5/4 11:00AM	5/4 11:00AM	5/4 11:00AM	-	-	-
water level inside the reactor core (meter) *1	-1.7	-1.5	-1.8	-	+1.989	+2.313
	5/4 11:00AM	5/4 11:00AM	5/4 11:00AM	-	5/4 12:00PM	5/4 12:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)	279.5	242.6	263.3	-	-	-
	5/4 11:00AM	5/4 11:00AM	5/4 11:00AM	-	-	-
temperature of the spent fuel pool (degrees Fahrenheit)	-	120.2	-	-	105.4	96.8
	-	5/4 11:00AM	-	-	5/4 12:00PM	5/4 12:00PM
Amount of water in total shot/injected to the spent fuel storage pool (tons)	90	642 - 657	5,390.5	3,306.2	-	-
	as of 5/1 5:00PM	as of 5/1 5:00PM	as of 5/1 5:00PM	as of 5/1 5:00PM	-	-

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

• Fukushima Daiichi Unit 1 reactor
• As of 3:00PM on May 4, injection of nitrogen gas into the primary containment vessel to prevent an explosion by accumulated hydrogen gas continues.
• As of 3:00PM on May 4, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 2 reactor
• As of 3:00PM on May 4, the injection of freshwater into the reactor core continues.
• Fukushima Daiichi Unit 3 reactor
• As of 3:00PM on May 4, the injection of freshwater into the reactor core continues.
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