10 oldest nuclear plants in the united states

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PicturesTen Oldest U.S. NuclearPlants: Post-Japan Risks

As U.S. authorities w eigh a safety overhaul,

heres a look at the risks unearthed at post-

Fukushima inspections of the ten oldest U.S. nuclear reactors.

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PicturesTen Oldest U.S. Nuclear Plants: Post-Japan Risks

Oyster Creek, New Jersey, September1969

Photograph by Mel Evans, AP

This story is part of a special series that explores energy issues. For more, visit

The Great Energy Challenge.

The world's largest nuclear energy producer, the United States, Tuesday aired

its first detailed public examination of whether stronger safety standards are

needed in light of Japan's Fukushima Daiichi nuclear disaster.

Although the U.S. Nuclear Regulatory Commission (NRC) task force concluded

that the sequence of events that caused Japan's crisis was unlikely to recur in

the United States, the panel has urged a new focus on preparing for the

unexpected.

(Related: "How is Japan's Nuclear Disaster Different?)

Especially at issue is how to deal with "beyond design-basis" risks, events

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considered too unlikely to be factored in when the plants were being designed.

The U.S. task force recommended that a framework of "extended design-basis"

requirements be established for the 104 reactors in the United States. This is

especially important, task force member Gary Holahan said, in light of the fact

that "many of the older plants might have less robust seismic, flooding, and

other features."

"Part of the concept of the framework is for the NRC to articulate expected safety

requirements, and to test all plants, no matter their age or design, against that

same standard, said Holahan, deputy director of NRC's office of new reactors.

The post-Fukushima inspection reports that NRC ordered for all U.S. nuclear

power plants provide a window into risks that the task force says the agency

should address.

(Related: "Energy-Short Japan Eyes Renewable Future, Savings Now")

For instance, in their April visit to the oldest U.S. nuclear power plant, Exelon's

Oyster Creek, near Toms River, New Jersey, close to the shore, the inspectors

noted that if power were lost, emergency venting procedures "could result in

hydrogen accumulation in the reactor building." Such a build-up is believed to

have caused the explosions at Fukushima Daiichi, which, like Oyster Creek, had

boiling water reactors with Mark 1 containment systems. Among the NRC task

force's recommendations is that reliable hardened vent designs be required in

such reactors. (Fukushima and most of the 31 U.S. boiling water reactors have

hardened vent designs; the task force is urging steps to make them more

reliable.)

Here's a look at some of the other post-Fukushima concerns raised by

inspectors at the ten oldest U.S. nuclear power plants.

-- Marianne Lavelle and Christina Nunez

Published July 19, 2011

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10 oldest nuclear plants in the united states

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