Michele Kearney's Nuclear Wire

Major Energy and Environmental News and Commentary affecting the Nuclear Industry.

Thursday, April 28, 2011

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

For your reference, JAIF (Japan Atomic Industrial Forum) has been posting the translation of news reports on their website.

Please direct any questions regarding this document to me, Ishida@denjiren.com or Samuel Lederer, Researcher of FEPC at lederer@denjiren.com.

Update to Information Sheet Regarding the Tohoku Earthquake
The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office
As of 12:00PM (EST), April 28, 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
4/27
10:20AM
4/27
10:10AM
4/27
10:00AM
4/27
11:56AM
4/27
10:50AM
4/27
10:40AM
Nuclides
(half-life)
Concentration (Unit : Bq/cm3)
I-131
(8 days)
5.5 x 101
3.9 x 102
2.8 x 101
4.9 x 10-2
4.1 x 10-2
3.1 x 10-1
Cs-134
(2 years)
5.3 x 101
2.1 x 101
2.8 x 100
1.2 x 10-1
6.6 x 10-2
2.4 x 10-1
Cs-137
(30 years)
6.2 x 101
2.4 x 101
3.0 x 100
1.3 x 10-1
7.6 x 10-2
2.6 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
4/27 7:06AM
  (a)
4/27
6:59AM
(b)
4/27 1:50PM
(c)
I-131
(8 days)
6.3 x 101
1.0 x 101
2.0 x 10-2
4.0 x 10-2
1,600
250
0.5
Cs-134
(2 years)
2.6 x 101
3.8 x 100
1.1 x 10-1
6.0 x 10-2
430
63
1.8
Cs-137
(30 years)
2.7 x 101
4.0 x 100
1.1 x 10-1
9.0 x 10-2
300
44
1.2

    • At 9:00PM (JST) on April 28, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 48 micro Sv/hour.
    • At 9:00PM on April 28, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 21.8 micro Sv/hour.
    • Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on April 28 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)
0.415
-0.016
-0.055
-
0.007
0.013
4/28
5:00AM
4/28
5:00AM
4/28
5:00AM
-
4/28
6:00AM
4/28
6:00AM
pressure inside the primary containment vessel (absolute pressure, MPaabs)
0.125
0.075
0.1017
-
-
-
4/28
5:00AM
4/28
5:00AM
4/28
5:00AM
-
-
-
water level inside the reactor core (meter) *1
-1.65
-1.5
-1.85
-
+2.081
+2.138
4/28
5:00AM
4/28
5:00AM
4/28
5:00AM
-
4/28
6:00AM
4/28
6:00AM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)
225.1
247.8
186.8
-
-
-
4/28
6:00AM
4/28
6:00AM
4/28
6:00AM
-
-
-
temperature of the spent fuel pool (degrees Fahrenheit)
-
122.0
-
-
104.7
80.6
-
4/28
5:00AM
-
-
4/28
6:00AM
4/28
6:00AM
the temperature directly above the spent fuel pool by thermography measurement (degrees Fahrenheit)
73.4
-
132.8
129.2
-
-
4/26
7:30AM
-
4/26
7:30AM
4/26
7:30AM
...

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