New 57 (Sv/h) Radiation Increase In Unit 1 After Aug 17 Quake Near Fukushima Daiichi
A new significant earthquake ( 6.2) occurred at Fukushima Daiichi on August 17th . In our previous report we explained the connection between the recent 6.0+ earth quakes and changes at the plant. The quakes caused changes in the pressure, temperature and radiation levels in the reactors indicating relocation of the melted fuel and concerns about building integrity.
After the most recent quake on the 17th, the radiation readings at the drywell “b” sensor spiked from 359 (Sv/h) on August 15th to 416 (Sv/h). This was a 57 (Sv/h) jump in radiation levels in just over one day. The drywell sensors are in the concrete containment bulb below the reactor pressure vessel.
Radiation Readings (TEPCO csv data files)
#1 drywell b radiation [Sv/h] new records
8/17 17:00 416
8/18 5:00 412
8/18 11:00 340
Earthquake Report (USGS earth quake reporting system)
Magnitude
6.2
Date-Time
Wednesday, August 17, 2011 at 11:44:07 UTC
Wednesday, August 17, 2011 at 09:44:07 PM at epicenter
Time of Earthquake in other Time Zones
Location
36.776°N, 143.773°E
Depth
10 km (6.2 miles) (poorly constrained)
Region
OFF THE EAST COAST OF HONSHU, JAPAN
Distances
304 km (188 miles) E of Iwaki, Honshu, Japan
339 km (210 miles) E of Mito, Honshu, Japan
349 km (216 miles) ESE of Sendai, Honshu, Japan
418 km (259 miles) ENE of TOKYO, Japan
Location Uncertainty
horizontal +/- 27.4 km (17.0 miles); depth +/- 12.8 km (8.0 miles)
Parameters
NST=284, Nph=251, Dmin=542.1 km, Rmss=0.97 sec, Gp= 40°,
M-type=regional moment magnitude (Mw), Version=7
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc0005fj1
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