Michele Kearney's Nuclear Wire

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

Wednesday, April 20, 2011

FEPC Update to Information Sheet Regarding Tohoku Earthquake 4/20

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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