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TEPCO said one of the main causes of a rapid collapse of Unit No. 1 was the absence of two mechanisms of condenser coils and condensation of isolation, to perform their intended functions .
The suppression pool has thousands of tons of water in a concrete pipe under the containment vessel, which houses the reactor. The water is typically used to control the amount of water vapor and the level of pressure within the containment vessel, but can also be used for reactor cooling.
Condenser coils insulation around the tank with the steam of cold water, turns water to the reactor and back again. The devices can operate without external power is obviously the reactor steam rises, even if the condenser coils do not require battery power to allow the valves to work.
According to TEPCO, workers were able to pump water into the reactor pool removal due to failure of an emergency diesel engine were immersed in the tsunami.
The condenser coils kick in isolation immediately after the earthquake, but lost his position after backup battery has been submerged by the tsunami, "said Junichi Matsumoto, TEPCO spokesman on nuclear issues .
"The battery could have survived had there been a better protection from tsunami," says Matsumoto.
"It 's possible that the condenser coils of cooling did not act properly," said Keiji Miyazaki, a professor emeritus of nuclear engineering at the University of Osaka. "Without the cooling water, fuel, of course, begins to melt in a few hours."
Batteries that can store energy for a while, even after the external power supply is interrupted, may be dead fast enough, or not working at all, experts say.
"The batteries may be able to operate equipment as small as meters for several hours," said Hiroaki Koide, assistant professor at the Institute's research reactor at Kyoto University. "They are not very durable when used to operate machinery such as condenser coils."