JAPAN | TEPCO installs cover over No. 3 reactor’s turbine building as typhoon approaches

Posted on July 19, 2011


JAPAN | MAINICHI | 19 July 2011

Tokyo Electric Power Co. (TEPCO) carried out repair work on the No. 3 reactor of the Fukushima No. 1 Nuclear Power Plant on July 18 as Typhoon No. 6 approached the nation’s Pacific coast.

TEPCO mended one of two holes in the roof of the No. 3 reactor’s turbine building by installing a cover over it. The utility was to conduct similar repair work on the other hole on July 19.

The turbine building apparently suffered the damage after a hydrogen explosion rocked the No. 3 reactor building following the March 11 Great East Japan Earthquake and tsunami.

Highly radioactive contaminated water was found in the turbine building, and rain coming through the holes was threatening to raise the water level. The repair work was carried out to prevent the contaminated water from overflowing.

TEPCO installed the cover over the hole, 11 meters long and 14 meters wide, by using three structural objects, each 5 meters long, 16 meters wide and 40 centimeters thick.

During the repair work, radiation doses of two workers were 10 millisieverts above their projected levels, with one of them exposed to a maximum 12 millisieverts.

On July 19, TEPCO will cover the smaller hole measuring 5 meters long and 2 meters wide, along with a roof skylight whose top was destroyed by a blast triggered by the hydrogen explosion.

TEPCO will also use sandbags to cover holes in two gutters whose plumbing had been damaged, company officials said.

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