No confusion.  "Basin and Range" and "Great Basin" largely overlap.  Go to Wikipedia for a map of the Great Basin, defined as the hydrologically isolated catchment that does not drain to the Pacific Ocean.  You will see that it covers most of the state of Nevada, about half of Utah, and bits of Oregon and Idaho.  (But nothing in Wyoming.)

Look up "Yucca Mountain" on Wikipedia, and you will see that it lies within the Great Basin.  Fears that radioactive waste will percolate into the Colorado River are misinformed at best (nonsense, actually).

The history of Yucca Mountain is quite interesting.  Did you know that at least two appointed heads of the government bureau overseeing the work over the decades were outspoken _critics_ of the program before they were put into the job?  Sort of like Pruitt at the EPA?  ;-)   I wonder why supposedly science-literate Democrats (who now claim to love objectivity so much)  never complained about that ...  Very mysterious.  ;-)