Experts Had Long Criticized Potential Weakness in Design of Stricken Reactor

From the New York Times:

The warnings were stark and issued repeatedly as far back as 1972: If the cooling systems ever failed at a “Mark 1” nuclear reactor, the primary containment vessel surrounding the reactor would probably burst as the fuel rods inside overheated. Dangerous radiation would spew into the environment.

Now, with one Mark 1 containment vessel damaged at the embattled Fukushima Daiichi nuclear plant and other vessels there under severe strain, the weaknesses of the design — developed in the 1960s by General Electric — could be contributing to the unfolding catastrophe.

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Delay in Transmittal of Director's Decision


Your petition dated September 30, 2010 addressed to Stephen Burns, Office of the General Counsel, is currently being reviewed by the U.S. Nuclear Regulatory Commission staff pursuant to 10 CFR 2.206 of the Commission's Regulations. This letter is to inform you that the due date for the final Director's Decision has been delayed from March 11, 2011, to May 13, 2011. The delay is necessary to complete the technical review and accommodate the required Petitioner/licensee draft Director's Decision review. NRC expects to provide you, and the licensee, the proposed Director's Decision by April 8, 2011, for your review and comment.

Please feel free to contact John Buckley at 301-415-6607 to discuss any questions related to this petition.


Larry W. Camper, Director
Division of Waste Management and Environmental Protection
Office of Federal and State Materials and Environmental Management Programs

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Susquehanna: Fire Protection Baseline Inspection


Download ML110740422 (PDF)

Peach Bottom: NRC Examination Report


Download ML110740322 (PDF)

Persons Living Within 10 Miles of Nuclear Power Plants

EFMR: Radiation Monitoring Stations

The EFMR Monitoring Group is installing continuous radiation monitors at several locations around the Three Mile Island nuclear power station.  The monitors are connected by telephone to a central computer, which downloads the data and displays it.  The monitors can be set to record data at preset intervals varying from minutes to hours and can store 1500 data points.  The data is downloaded via a dedicated telephone line at preset polling intervals.  If the radiation level exceeds a preset alarm level the data is automatically downloaded to the central computer and a polling of all stations is initiated.  The software allows the data to be displayed as tables, graphs or readings on a diagram or map.


The monitoring station consists of a Thermo Eberline ESM Model FHZ 621 G-L4 wide range detector in a weatherproof housing.  The housing also contains an uninterruptible power supply (UPS) and DC power supply, which operates the detector, the RS232 interface adapter, and a telephone modem.  The battery in the UPS will operate the monitor and modem for several hours after loss of AC power.  The detector is capable of measuring dose equivalent rates from background to 10 rem/hour.  The detector also has a feature that uses the difference in radiation energy between natural background radiation and reactor fission product radiation to determine whether small radiation increases are from natural or man-made sources.  The chart below shows data from one of the monitors during a 48-hour test.  The peak is from a 137Cs calibration source.

Five monitoring stations have been purchased and the electrical and telephone installations have been completed for 3 stations as of 27 Mar 03.  The other two stations are being used for testing and will be installed when the computer programming and testing is complete.


TMI Health Expert Reports

Export Witness Report: Three Mile Island Litigtation by Arnold Gundersen (Download PDF)

Post Accident Containment Leakage by Arnold Gundersen (Download PDF)

Preliminary Estimates of Radioactivity Releases from Three Mile Island by Lake Barret, NRC (Download PDF)

Nuclear expert: “50-50 chance of a catastrophic radiation” from Japan

From GlobalPost:

To get independent answers about the risks faced by people, GlobalPost turned to Arnold Gundersen, a 39-year veteran of the nuclear industry. Now chief engineer at Fairwinds Associates, he has worked as a nuclear plant operator and he served as an expert witness in the investigation into the Three Mile Island accident.

GlobalPost: Officials have said the possibility of a large-scale radiation release is small. Do you agree?

Arnold Gundersen: I think that the probability of a large scale release is about 50-50, and I don’t call that small.

GlobalPost: Why do you think that?

Gundersen: For several reasons. One, you’ve got three reactors involved. Two, you’re already picking up radiation on aircraft carriers a hundred miles away at sea, on helicopters 60 miles to the north, and in town. So clearly, as these plants become more and more difficult to control, it becomes quite likely that a containment now will have a gross failure. And a gross failure will release enormous amounts of radiation quickly.

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Will nuclear industry feel fallout?

From the Philadelphia Inquirer:

Japanese officials continue to struggle to contain the damage at a nuclear plant in Fukushima, but it may be much harder to limit the fallout for the future of nuclear energy in the United States.

Images of an explosion Saturday and word of a possible partial meltdown have rippled around the globe and are expected to linger for U.S. nuclear advocates already wrestling with their own economic and political challenges.

"This is obviously a significant setback for the so-called nuclear renaissance; the image of a nuclear plant blowing up on the television screen is a first," said Peter Bradford, a former commissioner for the U.S. Nuclear Regulatory Commission and a frequent industry critic. "Those cannot be good things for an industry that's looking for votes in the Congress and in the state legislatures."

Already, some on Capitol Hill are bringing back memories of the nuclear disasters at Three Mile Island and Chernobyl.

Rep. Ed Markey (D-Mass.) called Saturday for the NRC to impose a moratorium on building new nuclear reactors in seismically active areas until a sweeping new safety review is completed, and he demanded reviews of the Japanese plant's design to determine if there were flaws that could repeat themselves elsewhere.

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Commercial Nuclear Power Facilities in Japan

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