Workers at the Waste Isolation Pilot Plant
are still investigating what caused a radioactive release at the site,
but organic cat litter may be the culprit.
DOE/WIPP
In February, a 55-gallon drum of radioactive waste burst open inside America's only nuclear dump, in New Mexico.
Now investigators believe the cause may have been a pet store purchase gone bad.
"It was the wrong kitty litter," says , a geochemist in Richland, Wash., who has spent decades in the nuclear waste business.
It
turns out there's more to cat litter than you think. It can soak up
urine, but it's just as good at absorbing radioactive material.
"It
actually works well both in the home litter box as well as the
radiochemistry laboratory," says Conca, who is not directly involved in
the current investigation.
Hundreds of drums may contain the wrong cat litter. They are being sealed in larger containers, just to be safe.
C. McDonald/WCS
Cat litter has been used for years to dispose of nuclear waste.
Dump it into a drum of sludge and it will stabilize volatile radioactive
chemicals. The litter prevents it from reacting with the environment.
And this is what contractors at
were doing as they packed Cold War-era waste for shipment to the dump.
But at some point, they decided to make a switch, from clay to organic.
"Now
that might sound nice, you're trying to be green and all that, but the
organic kitty litters are organic," says Conca. Organic litter is made
of plant material, which is full of chemical compounds that can react
with the nuclear waste.
"They actually are just fuel, and so
they're the wrong thing to add," he says. Investigators now believe the
litter and waste caused the drum to slowly heat up "sort of like a slow
burn charcoal briquette instead of an actual bomb."
After it arrived at the dump, it burst.
"How come nobody caught this and raised a red flag?" asks ,
New Mexico's secretary of the environment. Flynn says that the cause of
the accident still isn't 100 percent clear. Scientists at Los Alamos
have yet to find the exact blend of cat litter and nuclear waste that
can spark a reaction.
But he says it is clear that the wrong
material went into some of the drums. He wants to know why the
Department of Energy, which handles the waste, let this happen.
"I'm frustrated," he says.
Flynn
says there are more than 500 drums packed with the wrong litter. The
majority are relatively safely underground in the dump, but dozens are
still at Los Alamos and another . None of these drums have burst so far,
but the lab and the company handling the Texas waste have put them in
heavy containers for added protection.
Flynn says federal authorities need to come up with a long-term solution and prevent future mix-ups.
"Ultimately
[the waste is] the responsibility of the Department of Energy," he
says. "It's also now their responsibility to clean it up and fix it."