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.
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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