FEPC Update to Information Sheet Regarding the Tohoku Earthquake 4/19

Update to Information Sheet Regarding the Tohoku Earthquake

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/  

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

As of 10:00AM (EST), April 19, 2011

• Radiation Levels

• On April 19, TEPCO announced the results of the analysis of groundwater samples from sub-drain pits at Unit 1 to 6 of Fukushima Daiichi Nuclear Power Station. The concentration of radioactive nuclides were as follows:

	Unit 1	Unit 2	Unit 3	Unit 4	Unit 5	Unit 6
Samples taken at	4/18 10:20AM	4/18 10:30AM	4/18 10:10AM	4/18 9:45AM	4/18 10:40AM	4/18 10:45AM
Nuclides (half-life)	Concentration (Unit : Bq/cm3)
I-131 (8 days)	4.3 x 101	4.5 x 102	2.6 x 100	7.9 x 100	1.0 x 10-1	5.6 x 10-2
Cs-134 (2 years)	1.1 x 101	5.8 x 100	2.2 x 100	8.6 x 10-1	6.6 x 10-2	7.8 x 10-2
Cs-137 (30 years)	1.2 x 101	6.7 x 100	2.3 x 100	9.2 x 10-1	7.1 x 10-2	7.6 x 10-2

• 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
	4/18 7:30AM   (a)	4/18 7:25AM (b)	4/18 2:00PM (c)
I-131 (8 days)	2.6 x 102	6.0 x 101	8.1 x 10-2	4.0 x 10-2	6,500	1,500	2.0
Cs-134 (2 years)	7.0 x 101	1.8 x 101	2.1 x 10-1	6.0 x 10-2	1,200	300	3.5
Cs-137 (30 years)	7.2 x 101	1.8 x 101	2.2 x 10-1	9.0 x 10-2	800	200	2.4

• At 5:00PM (JST) on April 19, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 59 micro Sv/hour.
• At 5:00PM on April 19, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 28.0 micro Sv/hour.
• Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 4:00PM on April 19 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)	0.430	-0.020	-0.040	-	0.007	0.010
	4/19 12:00PM	4/19 12:00PM	4/19 12:00PM	-	4/19 1:00PM	4/19 1:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)	0.165	0.085	0.1036	-	-	-
	4/19 12:00PM	4/19 12:00PM	4/19 12:00PM	-

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