The Tokyo Electric Power Company (Tepco) said on March 28 it had reached a water storage milestone at the Fukushima Dai-ichi nuclear station disaster site, having completed the transfer of treated water from flange-type tanks to a new welded-style tank. The effort to transfer water treated with multi-nuclide removal equipment (ALPS) was completed “within schedule,” only just, given the deadline was to have the task done by the end of the month. The transfer reduces the risk of leaks from the flange tasks, Tepco said.
The original flange tanks were brought in for availability – for speed and efficiency, said Tepco. Over time, however, the flange tanks included some risk of leaking due to the gradual deterioration of their rubber gaskets. In the interest of long-term safety, the company said, Tepco decided to switch to the more durable welded tanks “which do not have seams or gaps.”
The flange tanks originally contained contaminated water yet to be processed. They were also put to use in an intermediate step holding water that had not completed the processing.
Fully treated water at Fukushima Dai-ichi is in a holding pattern, waiting for approval to be dumped into the ocean. There is more than 1 million cubic meters of treated water ready to be dumped.
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