nuclear-news

The aging tanks at the former Hanford nuclear weapons complex contain 56 million gallons of sludge, the byproduct of several decades of nuclear weapons production, and they represent one of the nation’s most treacherous environmental threats.

Energy Department officials have repeatedly assured the public that they have the advanced technology needed to safely dispose of the waste. An industrial city has been under development here for 24 years, designed to transform the sludge into solid glass and prepare it for permanent burial.

But with $13 billion already spent, there are serious doubts that the highly complex technology will even work or that the current plan can clean up all the waste. Alarmed at warnings raised by outside experts and some of the project’s own engineers, Department of Energy officials last year ordered a halt to construction on the most important parts of the waste treatment plant.

“They are missing one important target after another,” said Sen. Ron Wyden (D-Ore.), chairman of the Energy and Natural Resources Committee. “It feels like we are going around in circles.”……….

Many of the problems stem from the decision to launch construction of the plant even before engineers had completed the design. The job of turning waste as thick as peanut butter into glass is at the leading edge of nuclear chemistry, a job made difficult by the complex mixture of wastes that were fed into the underground tanks by some of the nation’s largest industrial corporations under a cloak of government secrecy.

The basic plan is to pump the waste into a pre-treatment plant, a factory larger than a football field and 12 stories tall, that would filter and chemically separate the waste into two streams of high- and low-level radioactivity. Then, two other plants would “vitrify,” or glassify, the waste. One would produce highly radioactive glass destined for a future geological repository, and the other a lower radioactive glass that could be buried at Hanford.

But serious questions were raised last year after Walter Tamosaitis, one of the scientific chiefs of the project, disclosed that the innovative technology for mixing the waste in processing tanks could cause dangerous buildups of explosive hydrogen gas and might allow plutonium clumps to form……. http://www.latimes.com/nation/la-na-hanford-nuclear-risks-20131130,0,5013027.story#axzz2m8Dynzbj