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Diagram of the Fermi 2 nuclear reactor, via NRC.

The New York Times reports today that the reactor design used in Japan’s Fukushima Daiichi plant — as well as in 16 other nuclear plants in the U.S. — has been dogged by safety concerns for decades.

The G.E. Mark 1 reactors use a weaker containment vessel than other types of reactors, the Times reports — making them cheaper, but also at potentially higher risk of failure. Safety officials, as early as the 1970s, were raising alarms about the potential for an explosion and rupture in the containment units from a buildup of hydrogen.

Of the 16 plants in the U.S. that use the Mark 1 containment system, six are in the Midwest:

  • Cooper Nuclear Station in Brownville, Nebraska
  • Dresden Nuclear Power Station in Morris, Illinois
  • Duane Arnold Energy Center in Palo, Iowa
  • Fermi 2 in Newport, Michigan
  • Monticello Nuclear Generating Plant in Monticello, Minnesota
  • Quad Cities Nuclear Power Station in Moline, Illinois
  • For their part, G.E. defends the reactor design, telling the Times “there has never been a breach of a Mark 1 containment system.”

    UPDATE: Reuters interviewed a G.E. engineer, who said he resigned 35 years ago over concerns about the safety of the Mark 1 containment system.

    Ken Paulman

    Ken is the director of the Energy News Network at Fresh Energy and is a founding editor of both Midwest Energy News and Southeast Energy News. Prior to joining Fresh Energy, he was the managing editor for online news at Minnesota Public Radio. He started his journalism career in 2002 as a copy editor for the Duluth News Tribune before spending five years at the Spokesman-Review in Spokane, Washington, where he worked as a copy editor, online producer, features editor and night city editor. A Nebraska native, Ken has a bachelor's degree from the University of Nebraska-Lincoln and a master's degree from the University of Oregon. He is a member of the Society of Professional Journalists and Investigative Reporters and Editors.

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