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Washington Nuke Waste Tanks Flawed?

Publication Date:   2:22 pm, Sunday, March 2, 2014
Author:  NICHOLAS K. GERANIOS
Source:  San Francisco Chronicle/The Associated Press
Link:  http://www.sfgate.com/business/energy/article/AP-Newsbreak-Concerns-raised-about-Hanford-tanks-5279883.php

America's own slow-motion Fukushima.

SPOKANE -- While one of the newer double-walled nuclear waste storage tanks at a Washington state complex has leaked, six others have "significant construction flaws" that could lead to additional leaks, according to documents obtained by The Associated Press.

The 28 double-walled tanks at Hanford nuclear waste complex hold some of the worst radioactive waste at the nation's most contaminated nuclear weapons site.

One of those giant tanks was found to be leaking in 2012. But subsequent surveys of the other double-walled tanks performed for the U.S. Department of Energy by one of its Hanford contractors found at least six shared defects with the leaking tank that could lead to future leaks, the documents said. Thirteen additional tanks also might be compromised, according to the documents.

Questions about the storage tanks jeopardize efforts to clean up radioactive waste at the southeastern Washington site. Hanford cleanup already costs taxpayers about $2 billion a year.

"It is time for the Department (of Energy) to stop hiding the ball and pretending that the situation at Hanford is being effectively managed," Sen. Ron Wyden, D-Ore., wrote Friday in a letter to Energy Secretary Ernest Moniz.

Energy Department officials in Richland said the agency continues to make thorough inspections of the tanks, and has increased the frequency of those inspections.

"They used to be reviewed every five to seven years," said Tom Fletcher, the Energy Department's assistant manager for tank farms. "Now we are moving to a three-year time frame."

The department is in the process of inspecting the final eight double-walled tanks at Hanford that have not been analyzed since the leak was detected in late 2012, Fletcher said Friday.

No new leaks have been found, he said.

"If there are changes or improvements we need to make in the program, based on what we learn, to make sure we capture the risks that exist on the tank farms, we will make them," Fletcher said.

He added the Energy Department continues to examine the possibility of building new storage tanks at Hanford.

Concerns about the disposal of nuclear waste and the threat of leaks are not limited to Washington state. Two weeks ago, 13 workers at an underground nuclear dump in New Mexico were exposed to radiation. The above-ground radiation release led to the shutdown of operations at the Waste Isolation Pilot Plant as authorities investigate the cause of the leak and the health effects on employees.

Tom Carpenter of the citizen watchdog group Hanford Challenge said he wasn't surprised that more of the double-walled tanks are in danger of leaking.

"These tanks have an engineered design life, and we are reaching the end," Carpenter said. "It's bad planning that they don't have new tanks up and running."

While new tanks are expensive, cleaning up a leak is more expensive, he added. "The price for cleaning up the environment once this stuff gets out there is incalculable."

Hanford contains some 53 million gallons of high-level radioactive wastes from the production of plutonium for nuclear weapons. They are stored in 177 underground storage tanks, many of which date back to World War II and are single-walled models that have leaked. The 28 double-walled tanks were built from the 1960s to the 1980s.

Current plans call for transferring wastes from leaking single-walled tanks to the newer and bigger double-walled tanks, where the waste will be stored while a $13 billion plant for treating the waste is constructed. But the treatment plant is plagued with design problems and construction has stalled.

The situation did not appear dire until the news in October 2012 that the oldest of the double-walled tanks, called AY-102, had leaked, becoming the first of those 28 tanks to do so.

At the time, the Energy Department blamed construction problems with this particular tank for the leak and said it "seems unlikely" that the other double-walled tanks would leak.


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