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In page Timeline of the Fukushima nuclear accident:

"
  • Units 1 & 2 125-volt DC back-up batteries flooded and failed, Unit 3 batteries provide power for 30 more hours[citation needed]
  • 15:46 (approximate): Reactors 1 to 4 lose both AC power (from the external grid, and internal emergency diesel generators), and DC power from the battery banks. Reactor 1 & 2 control room also loses all DC power. Electrical cooling pumps fail, electrically operated valves are disabled and instruments in the control room fail. Reactor 1 Isolation Condensor (IC) valves fail – close with loss of power, disabling the IC cooling system. Reactor decay heat is at approximately 1.5% prior output (22 MW Unit 1, 33 MW Units 2 & 3). This causes the reactor temperature and pressure to start rising.[citation needed]