Video has been released of workers going inside a reactor building at the damaged Fukushima nuclear power plant in Japan. The footage, provided by the plant's operator Tokyo Electric Power Company (TEPCO), shows staff walking around the No 1 reactor building in protective suits. The images were filmed on Friday, a day after workers entered the site for the first time since shortly after the earthquake and tsunami in March. TEPCO began installing air purifying equipment last Thursday, in a bid to reduce radiation levels and to improve working conditions. On Sunday, the Japanese government approved TEPCO's plan to allow staff to return to the No. 1 reactor building to install a new cooling system, after its main door was left open overnight for ventilation.
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