Tokyo Electric Power Co. (TEPCO) said August 1 it has sealed off an area where high levels of radiation were detected at the Fukushima Daiichi nuclear power plant in Japan.
TEPCO said radiation levels reached at least 10 sieverts per hour were detected near a duct connected to a ventilation stack between the No. 1 and No. 2 reactors, according to news reports. The previous record was reportedly three to four sieverts per hour monitored inside the No. 1 reactor on June 3.
TEPCO reportedly said melted fuel in the No. 1 reactor might have collected inside the duct after leaking from the containment vessel during venting early in the crisis. The company also said radiation levels around the plant were not rising, a sign that the duct was not leaking, according to reports.
The government reportedly has said radiation levels around the plant had fallen to “two-millionths” of the peak recorded March 15.
The government and TEPCO said they remain on target to bring the reactors to a safe state of cold shutdown by January at the latest now that a water circulation system has been established, the article said.
Subscribe to Nuclear Power International