Fukushima: Mark 1 Nuclear Reactor Design Caused GE Scientist To Quit In Protest
Damaged Japanese Nuclear Plant Has Five Mark 1 Reactors
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.”
The situation on the ground at the Fukushima Daiichi plant is so fluid, and the details of what is unfolding are so murky, that it may be days or even weeks before anyone knows how the Mark 1 containment system performed in the face of a devastating combination of natural disasters.
But the ability of the containment to withstand the events that have cascaded from what nuclear experts call a “station blackout” — where the loss of power has crippled the reactor’s cooling system — will be a crucial question as policy makers re-examine the safety issues that surround nuclear power, and specifically the continued use of what is now one of the oldest types of nuclear reactors still operating.
GE told ABC News the reactors have “a proven track record of performing reliably and safely for more than 40 years” and “performed as designed,” even after the shock of a 9.0 earthquake.
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 3 mile
Member Comments
The CEOs and Board Members of Tokyo Electric and General Electric are the ones who should be sent into these reactors to cool down the nuclear rods/waste! A couple hundred dozen bankers and brokerage firm executives too!
Fresh_Water Mar-17 I pray that the nuclear reactors in the US are strictly regulated. I have to pray because this kind of information is out of the hands of the average citizen. We are told one thing, then in a devastating disaster we seem to find out the opposite was true all along.
SarahT52 Mar-17 I am a Japanese. I am not good at English but I want to tell my heart to U.S people. We Japanese are very grateful to you American’s what nice support and help for Japanese victims in disaster.About nuclear plant in Fukushima, it is heart broken for me and I think there are a lot of reason why Fukushima nuclear plant has had this bad situation. 9.0M earthquake,Tsunami, An old style nuclear plant, not good inspections, GE’s design etc. All bad things were mixed together.Japanese 70 workers are working at the risk of their life in the Fukushima nuclear plant now. I hope.. their effort will soon pay off. We Japanese do our best. I am sorry to worry U.S people.I hope U.S people can learn some things from this Japanese desaster and all of American people will safe and live long life happily in good preparetions.I hope we Japanese can get over from this situation soon. Thank you.
Damaged Japanese Nuclear Plant Has Five Mark 1 Reactors
But the ability of the containment to withstand the events that have cascaded from what nuclear experts call a “station blackout” — where the loss of power has crippled the reactor’s cooling system — will be a crucial question as policy makers re-examine the safety issues that surround nuclear power, and specifically the continued use of what is now one of the oldest types of nuclear reactors still operating.
The CEOs and Board Members of Tokyo Electric and General Electric are the ones who should be sent into these reactors to cool down the nuclear rods/waste! A couple hundred dozen bankers and brokerage firm executives too!
Fresh_Water Mar-17 I pray that the nuclear reactors in the US are strictly regulated. I have to pray because this kind of information is out of the hands of the average citizen. We are told one thing, then in a devastating disaster we seem to find out the opposite was true all along.
SarahT52 Mar-17 I am a Japanese. I am not good at English but I want to tell my heart to U.S people. We Japanese are very grateful to you American’s what nice support and help for Japanese victims in disaster.About nuclear plant in Fukushima, it is heart broken for me and I think there are a lot of reason why Fukushima nuclear plant has had this bad situation. 9.0M earthquake,Tsunami, An old style nuclear plant, not good inspections, GE’s design etc. All bad things were mixed together.Japanese 70 workers are working at the risk of their life in the Fukushima nuclear plant now. I hope.. their effort will soon pay off. We Japanese do our best. I am sorry to worry U.S people.I hope U.S people can learn some things from this Japanese desaster and all of American people will safe and live long life happily in good preparetions.I hope we Japanese can get over from this situation soon. Thank you.