FEPC Update to Information Sheet Regarding the Tohoku Earthquake 4/26

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 11:30AM (EST), April 26, 2011

• Radiation Levels

• The concentration of radioactive nuclides from the groundwater sampled at sub-drain pits at Unit 1 to 6 of Fukushima Daiichi Nuclear Power Station were as follows:

	Unit 1	Unit 2	Unit 3	Unit 4	Unit 5	Unit 6
Samples taken at	4/25 10:05AM	4/25 10:10AM	4/25 9:55AM	4/25 11:21AM	4/25 10:20AM	4/25 10:24AM
Nuclides (half-life)	Concentration (Unit : Bq/cm3)
I-131 (8 days)	1.3 x 102	6.1 x 102	2.0 x 101	9.3 x 10-2	1.3 x 10-1	3.8 x 10-1
Cs-134 (2 years)	5.5 x 101	3.3 x 101	3.9 x 100	1.2 x 10-1	2.5 x 10-1	3.3 x 10-1
Cs-137 (30 years)	6.4 x 101	3.7 x 101	4.2 x 100	1.3 x 10-1	3.1 x 10-1	3.9 x 10-1

• 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
	4/25 6:48AM   (a)	4/25 6:43AM (b)	4/25 1:40PM (c)
I-131 (8 days)	5.6 x 101	1.1 x 101	2.1 x 10-2	4.0 x 10-2	1,400	280	0.53
Cs-134 (2 years)	2.6 x 101	3.7 x 100	9.1 x 10-2	6.0 x 10-2	430	62	1.5
Cs-137 (30 years)	2.7 x 101	3.9 x 100	1.0 x 10-1	9.0 x 10-2	300	43	1.1

• At 3:00PM (JST) on April 26, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 53 micro Sv/hour.
• At 3:00PM on April 26, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 23.1 micro Sv/hour.
• Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 4:00PM on April 26 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)	0.445	-0.016	-0.055	-	0.002	0.013
	4/26 11:00AM	4/26 11:00AM	4/26 9:00AM	-	4/26 6:00AM	4/26 6:00AM
pressure inside the primary containment vessel (absolute pressure, MPaabs)	0.150	0.080	0.1041	-	-	-
	4/26 11:00AM	4/26 11:00AM	4/26 9:00AM	-

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