福島原発建設に関わった技術者が、エピソードを明かしている。そもそも、津波が襲うような海岸ぎりぎりに設置するような設計ではなかったと。
When building were old U.S. plans copied
When planning the disaster pile Fukushima Daiichi fundamental mistakes were made. The admitted an engineer who was involved in building the nuclear plant. "At the start of construction of the reactor 1 in the year 1967, we have the construction of the U.S. company General Electric's copies," said Shiro Ogura, who was then working for Toshiba, at a press conference of Japanese Citizen's Nuclear Information Center.
Nuclear power plant in Japan
Although the situation on the sandy shores of Japan in the northeast, in a disaster area by the sea, clearly is different from that of the U.S. power plants, reactors, neither nor security systems have been designed for a tsunami. Nevertheless, we have taken over the construction almost one to one. "The danger of a tsunami, we have not considered at all," said Ogura, who had built the cooling systems for all reactors except the fourth, according to Japanese newspaper "Hokkaido". "We were close and to be ignorant. We have not considered whether the proposed measures will be sufficient," said Ogura.
The retired engineer emphasized the lack of experience that the Japanese had at that time with nuclear technology. "In the construction of reactor 1, we had no experience, we knew almost nothing at all We knew that the area is threatened by earthquakes and tsunami -.. But we were not able to consider this danger," said Ogura.
During the construction of the second reactor it had improved the design of General Electric. However, apparently not enough: "Back then we were told that there is no earthquake in this area that are more than 8" Also in the following decades, these specifications were not revised according to Ogura: Shortly before his retirement were the measures provided for earthquake resistance - but such a severe earthquake as the current account was not taken. "I feel responsible," says Ogura in terms of the nuclear disaster.
Besides power, other security systems, inadequate
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The engineer Masashi Goto, also ex-employees of Toshiba, said the disaster had been found in Fukushima, except that the power supply and other safety systems were not sufficiently planned for an emergency. So be the containment, the steel sleeve, is located in the actual reactor pressure vessel was designed for only half of the pressure that actually occurred after the accident.
Moreover, the diameter of the tubes with which the engineers have in recent days repeatedly discharged steam from the containment, may be too small, "said Goto. Security systems, which must actually available in different styles and independently of each other, were not been sufficient. When the pumps because of the unavailability of the emergency power supply stopped working and got one as a spare so you need to create systems approach to the fire on, but not designed for the cooling of nuclear reactors were addressed.
Whether the apparently defective specifications for reactors and safety systems of the operating company Tepco, created by public authorities or by Toshiba, was the former designer of the system, Ogura, do not answer on demand. Also Tepco Reserve left a request to the news agency DAPD unanswered.
(From: http://www.spiegel.de/wissenschaft/mensch/0,1518,751574,00.html)
