[John Rogers]

True info about the noise and I didn't want to get into that but...... I talked to an old retired shipmate of mine that worked in civilian plants until a couple years ago and the ones he worked in were all essentially "single level" and still into the early 2000's they never did any accident analysis with more than one thing failing! The Navy's accident scenarios were the same, only one item failing at a time so an earthquake and tsunami together would have never been calculated for.