10 cfr 19 July 8, 2019 16 32 64 128 10 cfr 19.12 10 cfr 19.11 10 cfr 19.13 10 cfr 1910 10 cfr 1926 10 cfr 190 Nrc 10 cfr part 19 10 cfr part 19 10 cfr parts 19 20 21 10 cfr 431 part 196