Michele Kearney's Nuclear Wire

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

Monday, May 9, 2011

FEPC Update to Information Sheet Regarding the Tohoku Earthquake



Please find the updated information sheet below and attached that summarizes the events from Update-41 at  9:00AM on 5/6.

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 9:30AM (EST), May 9, 2011
All times listed below are Japan Standard Time (JST) unless otherwise noted.
  • Radiation Levels
    • On May 9, TEPCO announced the result of the analysis of water samples from the spent fuel pool at Unit 4 of Fukushima Daiichi Nuclear Power Plant taken on May 7. The concentration of radioactive nuclides were as follows:

Nuclides
(half-life)
Concentration (Unit : Bq/cm3)
Sampled on
May 7
(Reference)
Sampled on
April 28
(Reference)
Sampled on April 12
(Reference) Sampled on
March 4
I-131
(8 days)
1.6 x 101
2.7 x 101
2.2 x 102
Under the Detection Limit
Cs-134
(2 years)
5.6 x 101
4.9 x 101
8.8 x 101
Under the Detection Limit
Cs-137
(30 years)
6.7 x 101
5.5 x 101
9.3 x 101
1.3 x 10-1

    • 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
5/6
2:15PM
5/6
2:25PM
5/6
2:31PM
5/6
11:17AM
5/6
2:03PM
5/6
1:46PM
Nuclides
(half-life)
Concentration (Unit : Bq/cm3)
I-131
(8 days)
7.1 x 100
1.4 x 102
5.8 x 100
1.6 x 10-2
1.5 x 10-2
4.0 x 10-2
Cs-134
(2 years)
1.4 x 101
1.5 x 101
9.0 x 10-1
6.2 x 10-2
Not Detectable
4.9 x 10-2
Cs-137
(30 years)
1.7 x 101
1.8 x 101
9.5 x 10-1
4.9 x 10-2
2.2 x 10-2
6.9 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
5/8
6:55AM
  (a)
5/8
7:00AM
(b)
5/8
1:55PM
(c)
I-131
(8 days)
5.6 x 100
2.1 x 100
Not Detectable
4.0 x 10-2
140
53
-
Cs-134
(2 years)
4.9 x 100
1.7 x 100
4.9 x 10-2
6.0 x 10-2
82
28
0.82
Cs-137
(30 years)
5.1 x 100
1.7 x 100
6.6 x 10-2
9.0 x 10-2
57
19
0.73

    • At 2:00PM on May 9, radiation level at main gate (approximately 3,281 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 44 micro Sv/hour.
    • At 2:00PM on May 9, radiation level at west gate (approximately 3,609 feet from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 18.0 micro Sv/hour.
    • Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 4:00AM on May 9 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)
0.465
-0.020
-0.081
-
0.006
0.013
5/9
11:00AM
5/9
11:00AM
5/9
11:00AM
-
5/9
12:00PM
5/9
12:00PM
pressure inside the primary containment vessel (absolute pressure, MPaabs)
0.120
0.060
0.1026
-
-
-
5/9
11:00AM
5/9
11:00AM
5/9
11:00AM
-
-
-
water level inside the reactor core (meter) *1
-1.65
-1.5
-1.9
-
+1.643
+2.083
5/9
11:00AM
5/9
11:00AM
5/9
11:00AM
-
5/9
12:00PM
5/9
12:00PM
temperature of the reactor vessel measured at the water supply nozzle (degrees Fahrenheit)
241.9
240.1
421.5
-
-
-
5/9
11:00AM
5/9
11:00AM
5/9
11:00AM
-
-
-
temperature of the spent fuel pool (degrees Fahrenheit)
...

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