Can Black Lodge entrances be traced via nuclear activity?
White Sands - Trinity & Part 8's happenings.
Nevada - home of Dougie 'the lady pleaser' Jones and also another testing site in the desert.
South Dakota? The Sudan test in Nevada apparently spread radiation there, but other than that I have nothing..
Twin Peaks - nuclear waste dumps mentioned in TSHOTP.
According to the section in Secret History about JPL/Jack Parsons/Alistair Crowley/L. Ron Hubbard, there was eight "gateways to hell" and Parsons did some kind of ceremony at one which was near Roswell right before the alien crash/sighting there that Dougie Milford witnessed. I'd put my money on those "gateways" before nukes exclusively, but I guess it's possible. The only other one I remember being mentioned was in Pasadena, CA.
The other "known" door to the Lodges is in Buenos Aires isn't it? I was just searching and I can't find any history of any nuclear event there. There's a power plant, but no disaster/melt down or anything like that.
EDIT: Interesting side note: apparently almost everything in Secret History about Jack Parsons is 100% legit. From founding JPL, to his dealings in Thelemics/Crowley, to L. Ron Hubbard stealing his girl and his money, and even the part about the "Workings", i.e. rituals he performed. He even died in a "suspicious" explosion in his house. What a fascinating dude...