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Friday, 11 September 2015

Typhoon Etau flooded Fukushima Daiichi

Heavy rains in north eastern Japan have caused flooding at Fukushima Daiichi. Rivers in the region have flooded and a number of nearby towns have declared flood alerts. JMA reported flooding in Tomioka and Futaba near the plant. While TEPCO has not released a clear report on ongoing problems at the plant, bits of information came out in the routine reporting.
K drainage, one of the existing rainwater drainage systems known to transport contaminated runoff out of the plant over topped its containment system. Contaminated water reached the open ocean. Radiation levels recorded on the 9th showed moderately contaminated water was leaking.
K drainage as of the 9th
130 bq/liter c134
550 bq/liter c137
970 bq/liter beta
TEPCO did announce that they were now diverting K drainage water into the C drainage control system.
※ camera for drainage of K drainage is, by providing a weir at the same drainage channel, we have established a transfer pump but has been transferred to the C drainage channel leading to the harbor within, September 9, which was placed in a K drainage After a review of the video, due to the influence of rainfall, over the rainwater weir between 0:28 minutes to 2:34 and 3:58 minutes to 4:24, it is drainage part to the open ocean side Make sure. After that, all rainwater K drainage channel is transferred to C drainage, no drainage to the open ocean.
The B&C drainage systems at the plant were closed due to leaks at the H5 tank farm on the 9th. This system is known to transport contaminated soil and debris to the open ocean if the system is left open during spills or heavy rain events. TEPCO has not said if they have been able to successfully deal with the volume of water that flows out of this system.
Unit 1 work was suspended due to weather on the 9th.
The C tank farm has seen rain water leak out of the weir for this tank group. Water was being pumped out of the weir to prevent further leakage. Radiation readings for the leaking water were reported by TEPCO.
C plant (C East area and West area C)  outside analysis of rainwater in the Weir
< Stormwater C East in the Weir area>
 Cesium-134: detection limits (0.59 Bq/L) less than
And cesium-137: detection limits (0.71 Bq/L) less than
-All beta: 30 Bq/L
< C West area in the Weir in rainwater>
 Cesium-134: detection limits (0.60 Bq/L) less than
And cesium-137: detection limits (0.72 Bq/L) less than
-All beta: 25 Bq/L
< C plant outside  in rainwater>
 Cesium-134: detection limit value (0.70 Bq/L) less than
 Cesium 137:1.1 Bq/L
-All beta: 44 Bq/L
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