The multiple nuclide removing system (ALPS) suspended again

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The processing of stop (ALPS) A system Fukushima Daiichi Nuclear Power Station multi-nuclide removal equipment
February 26, 2014
Tokyo Electric Power Company

　Multi-nuclide removal equipment in (ALPS), and we have been (hot test) test using liquid waste was treated at contaminated water treatment facility, but (February 26) 0:21 pm, inverter failure alarm occurs today The booster pump No.2 of (A system) one line of which (A type, B type, C type) there are three system has stopped. As a result, A system has been shifted to the circulation standby operation.

　* Booster pump: pump Send to adsorption tower water was and carbonate precipitation process (removal of organic matter, removal of α nuclides) and iron co-precipitation process

　Currently, we have confirmed the site status, etc..

　There is no abnormality in the B system is doing a test run in the same facility. As for the C-based, it was stopped because of work.

　<Reference>
　The system diagram of a multi-nuclide removal equipment, please refer to page 48 of the following document.

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For Resumption of processing (ALPS) A system Fukushima Daiichi Nuclear Power Station multi-nuclide removal equipment
February 27, 2014
Tokyo Electric Power Company

　You have been making (hot test) test using liquid waste was treated at contaminated water treatment facility multi-nuclide removal equipment in (ALPS), 21 分 0 pm on February 26, booster pump No.2 of system A stop The is the follow-up of Ken A system has been transferred to circulation stand-by operation.

　We have investigated booster pump motor, supplied with equipment and inverter, but it was found that "ground fault" occurs in the booster pump for the inverter.

　For this reason, from the possibility that there is an abnormality in the internal inverter is high, we replace the inverter or the like.

　Then, start the booster pump to 22:47 today, we have resumed operations. Is there a problem with the operating state of the booster pump startup.