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 10:30AM (EST), April 20, 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 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 | |
4/19 7:27AM (a) | 4/19 7:25AM (b) | 4/19 2:00PM (c) | |||||
I-131 (8 days) | 4.7 x 101 | 3.3 x 101 | 3.1 x 10-1 | 4.0 x 10-2 | 1,200 | 830 | 7.8 |
Cs-134 (2 years) | 2.6 x 101 | 1.6 x 101 | 5.0 x 10-1 | 6.0 x 10-2 | 430 | 270 | 8.3 |
Cs-137 (30 years) | 2.4 x 101 | 1.5 x 101 | 5.1 x 10-1 | 9.0 x 10-2 | 270 | 170 | 5.7 |
- At 4:00PM (JST) on April 20, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 60 micro Sv/hour.
- At 4:00PM on April 20, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 27.9 micro Sv/hour.
- Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 1:00PM on April 20 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 | -0.023 | -0.043 | - | 0.007 | 0.010 |
4/20 12:00PM | 4/20 12:00PM | 4/20 12:00PM | - | 4/20 1:00PM | 4/20 1:00PM | |
pressure inside the primary containment vessel (absolute pressure, MPaabs) | 0.160 | 0.080 | 0.1045 | - | - | - |
4/20 12:00PM | 4/20 12:00PM | 4/20 12:00PM | - | - | - | |
water level inside the reactor core (meter) *1 | -1.7 | -1.5 | -1.85 | - | +2.059 | +1.941 |
4/20 12:00PM | 4/20 12:00PM | 4/20 12:00PM | - | 4/20 1:00PM | 4/20 1:00PM | |
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit) | 334.0 | 277.7 | 214.0 | - | - | - |
4/19 12:00PM | 4/19 6:00AM | 4/19 12:00PM | - | - | - | |
temperature of the spent fuel pool (degrees Fahrenheit) | - | 159.8 | - | - | 98.1 | 92.3 |
- | 4/20 12:00PM | - | - | 4/20 1:00PM |
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