10 cfr 54 July 8, 2019 16 32 64 128 10 cfr 54.4 10 cfr 54.37(b) 10 cfr 54.3 10 cfr 54.21 10 cfr 54.29 10 cfr 54.30 10 cfr part 54 10 cfr 50 54 10 cfr 50.2 10 cfr 50.55a 10 cfr 50.47