Vulnerabilities with Stored Nuclear Fuel

Monday, February 18, 2013 @ 10:02 AM gHale


Spent nuclear fuel stored at Savannah River Site with no clear disposition path presents increasingly serious “vulnerabilities” the U.S. Department of Energy (DoE) must address, a new federal report said.

The dangers, according to a technical assessment prepared by the Defense Nuclear Facilities Safety Board, include leaking, corroded and sometimes cracked containers, and the ongoing release of gases that indicate radioactive material continues to degrade.

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The January 3 report focuses on the site’s L-Area, where about 15,000 spent fuel assemblies stay in underwater storage basins. The board’s concern focuses on the older material that accounts for about 10 percent of the L-Area’s inventory.

“Nearly all the inner cans containing metal fuel are approximately 50 years old, and DoE is considering the possibility of extended storage of these cans for an additional 50 years,” inspectors wrote in an analysis sent by board chairman Peter Winokur to David Huizenga, the Department of Energy’s senior adviser for environmental management.

Although spent nuclear fuel from commercial power plants end up stored at those plants, a different kind of spent nuclear fuel gathered at Savannah River Site for quite a few decades.

The submerged containers include the widely varied fuels from Cold War activities and from “research reactors” in the U.S. and dozens of foreign countries, whose programs once required highly enriched uranium fuel that terrorists today might want.

Two years ago, the safety board singled out one batch of corroded fuel – from the Sodium Reactor Experiment launched in California in the 1950s – as being particularly dangerous and most in need of attention.

The reactor, which made history in 1957 by powering homes in nearby Moorpark, suffered damage during a coolant blockage two years later and shut down for good in 1964.

As a result of the board’s concerns, work began in September to process the 36 cans of sodium reactor fuel at nearby H Canyon – the nation’s sole remaining facility where certain types of plutonium, highly enriched uranium and aluminum-clad spent fuels end up processed for disposal.

Other than the sodium reactor fuel, the board wrote, the rest of the spent fuel inventory in L Basin “lacks a disposition pathway” and needs attention.

“The limited inspection data indicate that many of the cans have significant corrosion and that some have failed leading to fuel degradation,” the report said, noting the release of gas from several of the cans indicates the metal fuel is continuing to degrade.

“As the fuel degrades it becomes more difficult to handle, repackage, and/or process in the future, the report said.

In addition to the corroded fuels mentioned in the board report, L-Area also stores spent fuels – all containing weapons-grade material – recovered from other countries under the National Nuclear Security Administration’s Global Threat Reduction Initiative.

So far, material came to SRS from Turkey, Israel, Japan, Indonesia, Taiwan, Australia, Canada, Germany, Romania, Portugal, Sweden, Brazil, Argentina, South Korea, the Netherlands, Greece, Austria, Denmark, Chile, Italy, United Kingdom, Venezuela, Thailand, Spain, Uruguay, Colombia and the Philippines.

A DoE fact sheet said the L-Area basin has concrete walls three feet thick and holds 3.5 million gallons of water with pool depths of 17 to 30 feet.



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