TEPCO Admits to Leaks, Problems with Desalination Facility at Fukushima Daiichi. Unit 6 has a Flood.

29 05 2012

On top of everything else, TEPCO is trying to repairs hoses that get fresh water to the cooling pools at units 1-4 at Fukushima Daiichi. Read all about it at the bottom part of this report: http://www.4-traders.com/TOKYO-ELEC-POWER-6491247/news/Tokyo-Elec-Power-Mar-28-2012-Plant-Status-of-Fukushima-Daiichi-Nuclear-Power-Station-as-of-3-00-14243438/

– At around 8:30 on March 26, 2012, in the area of condensed water tanks for water desalinations (reverse osmosis membrane) of Fukushima Daiichi Nuclear Power Station, a partner company worker found that water was leaked from a pipeline (anti-pressure hose) which transferred the condensed water from the water desalinations to the condensed water tanks. In order to stop the water leakage, we stopped the transfer pumps of the water desalinations (reverse osmosis membrane) and then the leakage stopped. After that, we closed the valves at the both sides to the leakage point of the pipeline (anti-pressure hose). When we checked the leakage on the site later, we found that a part of the leaked water had been poured into a nearby drainage for general draining water. And then, we conducted sampling surveys on the leaked water, the water which was poured into the drainage, and the seawater around the exit of the drainage. As a result, we judged that some water including radioactive materials was poured into the sea from the exit of the drainage located at about 300 m south from the discharge channel of Unit 1-4 of Fukushima Daiichi Nuclear Power Station. At this moment, the water desalinations (reverse osmosis membrane and evaporative concentration apparatus) are not in service. However, because we have much treated fresh water, it does not affect water injection to the reactors. Total amount of leaked water is estimated to be approx 120 m3 in accordance with the operation hour of the pump. Approx. 80 L out of 120 m3 is estimated to flow into the sea at maximum. Thereafter, the cesium adsorption apparatus was stopped at 5:00 pm and the second cesium adsorption apparatus was stopped at 5:29 pm.
At 9:10 am on March 28, 2012, we restarted the 2nd Cesium Adsorption Apparatus after having completed the work against the leakage and it reached to the rated flow (approx 40 m3/h) at 9:20 am on the same day. At the 12:07 pm and 12:13 pm on the same day, we restarted the two lines of the desalination facility (reverse osmosis membrane). As for the Cesium Adsorption Apparatus, power retrofitting work had been conducted in order to establish 2 lines of power sources for accumulated water treatment facility. Thus, after having completed the work, at 2:32 pm on the same day, we restarted the Cesium Adsorption Apparatus and it reached the rated flow (approx. 19.1 m3/h).
– From 10:00 am to 4:00 pm on March 27, we transferred accumulated water from the basement of Unit 6 T/B to the temporary tank. At 10:00 am on March 28, we restarted the transfer.

 


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