A problem of infinite proportions

http://english.aljazeera.net/indepth/features/2011/06/201161664828302638.html

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Dr Sawada says that the creation of nuclear fission generates radioactive materials for which there is simply no knowledge informing us how to dispose of the radioactive waste safely.

Dr Ramana expects the plant reactors and fuel cores to be cooled enough for a shutdown within two years.
"But it is going to take a very long time before the fuel can be removed from the reactor," he added. "Dealing with the cracking and compromised structure and dealing with radiation in the area will take several years, there's no question about that."

Dr Sawada is not as clear about how long a cold shutdown could take, and said the problem will be "the effects from caesium-137 that remains in the soil and the polluted water around the power station and underground. It will take a year, or more time, to deal with this".

Gundersen pointed out that the units are still leaking radiation.

"They are still emitting radioactive gases and an enormous amount of radioactive liquid," he said. "It will be at least a year before it stops boiling, and until it stops boiling, it's going to be cranking out radioactive steam and liquids."

Gundersen worries about more earthquake aftershocks, as well as how to cool two of the units.

"Unit four is the most dangerous, it could topple," he said. "After the earthquake in Sumatra there was an 8.6 [aftershock] about 90 days later, so we are not out of the woods yet. And you're at a point where, if that happens, there is no science for this, no one has ever imagined having hot nuclear fuel lying outside the fuel pool. They've not figured out how to cool units three and four."

Gundersen's assessment of solving this crisis is grim.

"Units one through three have nuclear waste on the floor, the melted core, that has plutonium in it, and that has to be removed from the environment for hundreds of thousands of years," he said. "Somehow, robotically, they will have to go in there and manage to put it in a container and store it for infinity, and that technology doesn't exist. Nobody knows how to pick up the molten core from the floor, there is no solution available now for picking that up from the floor."

Dr Sawada says that the creation of nuclear fission generates radioactive materials for which there is simply no knowledge informing us how to dispose of the radioactive waste safely.

"Until we know how to safely dispose of the radioactive materials generated by nuclear plants, we should postpone these activities so as not to cause further harm to future generations," he explained. "To do otherwise is simply an immoral act, and that is my belief, both as a scientist and as a survivor of the Hiroshima atomic bombing."

Gundersen believes it will take experts at least ten years to design and implement the plan.

"So ten to 15 years from now maybe we can say the reactors have been dismantled, and in the meantime you wind up contaminating the water," Gundersen said. "We are already seeing Strontium [at] 250 times the allowable limits in the water table at Fukushima. Contaminated water tables are incredibly difficult to clean. So I think we will have a contaminated aquifer in the area of the Fukushima site for a long, long time to come."

Unfortunately, the history of nuclear disasters appears to back Gundersen's assessment.

"With Three Mile Island and Chernobyl, and now with Fukushima, you can pinpoint the exact day and time they started," he said, "But they never end."

Follow Dahr Jamail on Twitter: @DahrJamail

Source:  Al Jazeera