This procedure is suitable for all urgent conditions including fire, detonation, chemical overflow, flammable gas divulgence, serious power failure and other natural disaster accidents and so on.
In Los Angeles, fire officials reported localized power failures and downed wires in several city neighborhoods, but said that no major damage to infrastructure had been identified.
This time the cooling ponds for spent but still highly radioactive fuel rods were affected by a power failure and it took engineers some 30 hours to fix them.
The operator, Tepco, has released a picture of a dead rat near one of the switchboards and suggested that that could have been the cause of the power failure.