August 2, 2011 by staff
Fukushima Radiation, An area of ??extremely high radiation has been found in Fukushima Daiichi in a filtration system that helped reduce emissions from the reactor accident. The new water treatment equipment is starting trial operation.
Tokyo Electric Power Company (TEPCO) said a reading of more than 10,000 millisievert per hour from part of the Gas Treatment System Standby (sergeants) for units 1 and 2. This air moves from the reactor buildings with the environment through a series of filters, ultimately, liberation through an exhaust pipe shared by the reactors. It also provides the path which can be released by excess pressure ventilation.
During normal operation of the system also maintains a low pressure inside the reactor buildings to prevent potentially contaminated air out through small holes. Besides its use for ventilation of units 1 and 2 during the accident, but also may have been in operation since the power is reconnected, its radioactivity slowly because the air filter of the reactor building highly contaminated.
The high dose rate measured in the latter part of the sergeants, very near the bottom of the stack, and highlighted on a map of radiation released by Daiichi Tepco site.
Comparison with previous versions of the map showed that TEPCO has cleared many of the hotspots of radiation caused by the debris scattered by the explosions at the top of the accident sequence. The patches of concrete and steel previously recorded at 950, 550 and 170 millisievert per hour have been cleared, though much work remains with respect to areas with readings of 250, 160 and 120 millisievert per hour.
In line with this work, as well as spraying for dust control agents, air samples at the border sites yesterday showed the detection of iodine-131, cesium-134 and cesium-137. In fact, this shows that the radiation in air at the border plant is low enough for normal work practices, but not TEPCO expects to reduce its precautions for some time to come.
Treatment of cooling water and TEPCO is building a new treatment system to complement the existing provisions of water that has accumulated in the basement Units 1, 2 and 3 that leaked through the reactor vessel. The management of this water, which came to a total of 100,000 tons, has been a major concern.
Ad-hoc cooling circuit water sources in basements and sweets before re-injection into the reactor vessle, but it is long lines and problems. Which currently has a treatment capacity Areva while a second “simplified” system is close with Toshiba computers. The use of these two centers should increase “stability and redundancy,” TEPCO said.
Water levels in the basement are in a gradual downward trend, which should eventually allow TEPCO to increase the rate at which cooling water is injected and the goal of “cold shutdown” for the three reactor cores destroyed . Unit 1 has been below 100 ° C for several days, while Unit 3 is 106.6 ° C. Unit 2, however, remains far from the target in 122.5 ? C.
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