The operator of the damaged Fukushima Daiichi nuclear plant is bracing for severe tropical storm Neoguri as it moves toward eastern Japan on Thursday.
Workers at the complex are pumping out water accumulated in barriers surrounding storage tanks for radioactive water to prevent it from overflowing the barriers.
When heavy rain hit the plant last summer the water often overflowed.
Workers are also placing weights on large cranes to stop them toppling over. The cranes are used to clear debris surrounding the reactor buildings.
Officials at Tokyo Electric Power Company say that pumping up groundwater and the construction of an underground frozen wall will be carried out from Thursday night through Friday as scheduled.
They added that the work may be suspended when a warning is issued, depending on the situation.
Jul. 10, 2014 - Updated 08:32 UTC