According to CNN:
After warnings from the Japanese Prime Minister regarding natural disasters, the owner of the Chubu Electric Company has announced that they will shut down their reactors at the Hamaoka nuclear power plant. This move, which will effectively shut down the plant, comes after PM Naoto Kan requested that there be more protective measures against tsunamis and earthquakes to prevent possible grave damage similar to the Fukushima Daiichi plant incident.
Meanwhile, several workers re-entered the Fukushima Daiichi plant to measure radiation levels in the damaged facility. On Thursday, workers installed a ventilation system to filter radiation from the air. On Monday they went into the plant to see if the system was working. If radiation levels are low enough, workers will be sent in to try and restore the cooling system in the plant.