The next time you have a saltshaker handy, remove a few grains. If you have a simple magnifying glass, you’ll see the salt is really tiny cubes. Salt is a mineral and each grain is a well-formed crystal that breaks into cubic shapes.
Salt in your saltshaker looks like a simple solid. But salt far enough underground behaves like Silly Putty, oozing and flowing over time. Salt has been on my mind recently because I’ve been reading about nuclear energy. Bear with me and I’ll explain.
Nuclear plants give us a fifth of the electrical power that we use in the grid each day. Even some environmental activists think highly of nuclear energy because it gives us power without the production of greenhouse gases.
But our use of nuclear plants also demands that we address the question of burying radioactive waste. The good news is that we’ve started to do exactly that in New Mexico and so far things are going just as planned. I’ve been reading recently about that and related matters in a book called Power to Save the World by Gwyneth Cravens.
The four square mile Waste Isolation Pilot Plant (or WIPP) is in the Chihuahuan Desert. It makes use of one small part of an enormous salt bed.
In many parts of the world circulating groundwater could move nuclear waste after it’s buried in the Earth. Happily, the salt formation at WIPP is quite dry, with only a little water in it. Best of all, the water does not move to any appreciable extent from the salt to the surrounding rocks.
“Movement of groundwater from or through the salt formation to rocks nearby is essentially nonexistent,” Dr. Don Wall of Washington State University told me. Wall is the director of the nuclear reactor at WSU and he used to work on the WIPP project.