GE Engineers and American Government Officials Warned of Dangerous Nuclear Design5 of the 6 nuclear reactors at Fukushima are General Electric Mark 1 reactors.
GE knew decades ago that the design was faulty.
ABC News reported in 2011:
Thirty-five years ago, Dale G. Bridenbaugh and two of his colleagues at General Electric resigned from their jobs after becoming increasingly convinced that the nuclear reactor design they were reviewing — the Mark 1 — was so flawed it could lead to a devastating accident.
Questions persisted for decades about the ability of the Mark 1 to handle the immense pressures that would result if the reactor lost cooling power, and today that design is being put to the ultimate test in Japan. Five of the six reactors at the Fukushima Daiichi plant, which has been wracked since Friday’s earthquake with explosions and radiation leaks, are Mark 1s.
“The problems we identified in 1975 were that, in doing the design of the containment, they did not take into account the dynamic loads that could be experienced with a loss of coolant,” Bridenbaugh told ABC News in an interview. “The impact loads the containment would receive by this very rapid release of energy could tear the containment apart and create an uncontrolled release.”
Still, concerns about the Mark 1 design have resurfaced occasionally in the years since Bridenbaugh came forward. In 1986, for instance, Harold Denton, then the director of NRC’s Office of Nuclear Reactor Regulation, spoke critically about the design during an industry conference.
“I don’t have the same warm feeling about GE containment that I do about the larger dry containments,” he said, according to a report at the time that was referenced Tuesday in The Washington Post.
“There is a wide spectrum of ability to cope with severe accidents at GE plants,” Denton said. “And I urge you to think seriously about the ability to cope with such an event if it occurred at your plant.”
When asked if [the remedial measures performed on the Fukushima reactors by GE before 2011] was sufficient, he paused. “What I would say is, the Mark 1 is still a little more susceptible to an accident that would result in a loss of containment.”