<prompt> 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  <response>: Chitsuwa cheThree Mile. Izvi zvakazopedzisira zvaita kuti muna 1981 bhuku rinonzi NRC Fault Tree Handbook NUREG0492 ribudiswe, uye kushandiswa kwePRA kunomanikidzwa pasi pechiremera cheNRC. 