Mezue ahịrịokwu na-esonụ: N'ime ụlọ ọrụ ike nuklia, US Nuclear Regulatory Commission malitere iji usoro PRA gụnyere FTA na 1975, ma gbasaa nyocha PRA nke ọma na-esote ihe omume 1979 na
Agwaetiti Three Mile. 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.