Dee ihe na-aga n'ihu maka paragraf a - N'ime ụlọ ọrụ ike nuklia, US Nuclear Regulatory Commission malitere iji usoro PRA gụnyere FTA na 1975, ma gbasaa nyocha PRA nke ọma mgbe ihe omume 1979 na Three Mile Island gasịrị
Ọ dị mma. Nke a mechara mee ka e bipụta akwụkwọ NRC Fault Tree Handbook NUREG<unk>0492 n'afọ 1981 na iji iwu PRA n'okpuru ikike nchịkwa nke NRC.