TOKYO -- A new report says Japan's tsunami-ravaged nuclear plant was so unprepared for the disaster that workers had to bring protective gear and an emergency manual from distant buildings and borrow equipment from a contractor.
The report, released Saturday by plant operator Tokyo Electric Power Co., is based on interviews of workers and plant data. It portrays chaos amid the desperate and ultimately unsuccessful battle to protect the Fukushima Dai-ichi nuclear plant from meltdown, and shows that workers struggled with unfamiliar equipment and fear of radiation exposure.
The March 11 earthquake and tsunami destroyed the plant's power and crucial cooling systems, causing three reactor cores to melt and causing several explosions.
TEPCO has been criticized for dragging its feet on venting and seawater cooling -- the two crucial steps that experts say could have mitigated the damage. Company officials have said the tsunami created obstacles that were impossible to anticipate. An investigation by an independent panel is pending.
The report revealed insufficient preparations at the plant that TEPCO hadn't previously acknowledged. It said plant workers had a disaster drill just a week before the tsunami and "everyone was familiar with emergency exits," but it apparently did not help them cope with the crisis.
When the Unit 1 reactor lost cooling functions two hours after the quake, workers tried to pump in fresh water through a fire pump, but it was broken.
A fire engine at the plant couldn't reach the unit because the tsunami left a huge tank blocking the driveway. Workers destroyed a power-operated gate to bring in the engine that arrived at the unit hours later. It was early morning when they finally started pumping water into the reactor -- but the core had already melted by then.
Other workers were tasked with releasing pressure from Unit 1's containment vessel to avoid an explosion. But first they had to get the manual, which was not in the control room but in a separate office building at the plant. Aftershocks struck as they retrieved it.
Government reports released this month said the damage and leakage at the plant were worse than previously thought, with some of the nuclear fuel in three reactors likely having melted through the main cores and inner containment vessels. They said the radiation that leaked into the air amounted to about one-sixth of the Chernobyl nuclear disaster in 1986 -- double previous estimates.
On Sunday, TEPCO opened a door at Unit 2 to allow workers to install a cooling system and equipment to prevent an explosion. Workers have entered the reactor building before, but only for brief monitoring visits.
TEPCO said radiation released by the ventilation would be too small to threaten human health, and reported no abnormality. Workers have taken similar steps at Unit 1, which is moving ahead of the other reactors.
Meanwhile, more radioactive water is pooling at the plant. Workers scrambled to restart a key cleanup system, which was shut down Saturday hours after beginning full operations because a component reached its radioactivity limit faster than expected.
More than 100,000 tons of contaminated water at the plant could overflow within two weeks if action is not taken.