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The nuclear accident in Japan has rekindled debate about what to do with used reactor fuel. The Japanese power plant housed tons of highly radioactive used fuel rods in pools filled with water. There are similar fuel pools at more than 60 reactor sites in the U.S., so there's renewed interest in their safety. NPR's Christopher Joyce reports.

CHRISTOPHER JOYCE: The uranium fuel in the core of a nuclear reactor creates heat and power for about five to 10 years. Plant operators then transfer the used fuel rods - which are still hot and radioactive - to a nearby pool. In Japan, the pool lost cooling water. The fuel overheated and was probably damaged.

The event highlights the fact that the U.S. has lots of used fuel in similar pools, waiting to be disposed of in a permanent repository. Here's Ernest Moniz, a physicist at MIT, at a Senate hearing on the Japanese accident.

Professor ERNEST MONIZ (Physicist, MIT): I would say the storage of spent fuel between, if you like, the reactor and the presumed repository, has been an afterthought. It has not really been part of our serious policy discussion about fuel cycle design.

JOYCE: The presumed repository was Yucca Mountain, a complex of underground tunnels in Nevada that was decades in the making. The Obama administration has decided not to use the site.

During the long debate on Yucca Mountain, power companies continued to put more fuel rods in pools. Once they cool off, five to 10 years, they go into concrete and steel casks and are stored at the reactor sites.

Gregory Jaczko, chairman of the Nuclear Regulatory Commission, told the Senate this stop-gap system isn't perfect, but it works.

Dr. GREGORY JACZKO (Chairman, Nuclear Regulatory Commission): Right now, we believe that for at least a hundred years that fuel can be stored with very little impacts to health and safety.

JOYCE: Most nuclear critics say the casks work well, but the pools remain a weak link. Former nuclear engineer David Lochbaum is with the Union of Concerned Scientists.

Dr. DAVID LOCHBAUM (Union of Concerned Scientists): At all U.S. reactors, the spent fuel pool is housed in less robust containment than surrounds the reactor core. More irradiated fuel that is less well-protected and less well-defended is an undue hazard.

JOYCE: For example, spent fuel pools are not generally housed inside concrete containment buildings, as reactors are. They're inside an ordinary building. And as used fuel accumulates, reactor operators have had to pack the rods closer together in the pools, which requires even more cooling.

At Xcel Energy, Nuclear Affairs chief Terry Pickens says reactor operators had to do this, because the federal government failed to keep a promise it made to power companies long ago, to take their old fuel by 1998.

Mr. TERRY PICKENS (Director, Nuclear Policy, Xcel Energy): We were able to get it to where we thought we could make it to 1998, and then they still aren't performing. And now we still want to refuel and operate our reactors, so we have to make more space in the pools.

JOYCE: Pickens and the Nuclear Regulatory Commission say the pools and casks are safe. But it takes a lot of juggling to cycle the fuel rods through the pools and into the casks at the right time. And it's an expense that electricity consumers are paying for.

James Conca, a geophysicist at the Hanford nuclear site in Washington State, says the government needs to change the status quo.

Dr. JAMES CONCA (Geophysicist, Hanford Nuclear Site): Come up with a strategy for how you go forward, because you really can't go forward with nuclear anything unless you make the decision: Where are you going to put your waste? Away from the environment, away from humans?

JOYCE: The White House has appointed a panel of experts to do that: to find a place to put used reactor fuel, as well as old bomb-making waste. Conca has testified before that panel, and argues that salt deposits are the best place for a permanent dump site. Currently, the government operates the country's only underground nuclear repository in salt deposits in Carlsbad, New Mexico.

The panel spent several days visiting the site earlier this year. They're set to make their preliminary recommendation in July.

Christopher Joyce, NPR News.

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