The operator of the crippled Fukushima No. 1 nuclear power plant said Tuesday it has transferred some nuclear fuel from one of the reactor buildings damaged by hydrogen explosions in the 2011 disaster to another location for safer storage and management.

It was the first removal of such fuel from within the buildings for units Nos. 1 to 3, where it had been kept in storage pools, at the site, which suffered meltdowns after losing power following a massive earthquake and tsunami.

Seven unspent fuel rod assemblies were transferred Tuesday to a common pool about 100 meters away, according to Tokyo Electric Power Company Holdings Inc.