Pedzisa mutsara unotevera: Mukati meindasitiri yesimba renyukireya, US Nuclear Regulatory Commission yakatanga kushandisa nzira dzePRA kusanganisira FTA muna 1975, uye yakawedzera zvakanyanya kutsvagisa kwePRA zvichitevera tsaona ya1979 ku
Chitsuwa cheThree Mile. Izvi zvakazopedzisira zvaita kuti muna 1981 bhuku rinonzi NRC Fault Tree Handbook NUREG<unk>0492 ribudiswe, uye kushandiswa kwePRA kunomanikidzwa pasi pechiremera cheNRC.