Nuclear fracking was tested as part of the larger series of tests called Operation Plowshare. You can read about the first gas extraction test here: https://en.

Nuclear fracking was tested as part of the larger series of tests called Operation Plowshare. You can read about the first gas extraction test here: https://en.wikipedia.org/wiki/Project_Gasbuggy https://en.wikipedia.org/wiki/Project_Gasbuggy If I remember correctly, the tests worked, in that they produced a large amount of gas from tight rock formations. However the gas was mildly radioactive and it was thought that it would not be marketable.