<prompt> Qedela umusho olandelayo: Emkhakheni wamandla enuzi, i-U.S. Nuclear Regulatory Commission yaqala ukusebenzisa izindlela ze-PRA ezihlanganisa i-FTA ngo-1975, futhi yandisa kakhulu ucwaningo lwe-PRA kulandela ingozi yango-1979 e-  <response>: Isiqhingi saseThree Mile. Lokhu ekugcineni kwaholela ekushicilelweni kuka-1981 kwe-NRC Fault Tree Handbook NUREG0492, kanye nokusetshenziswa okuphoqelekile kwe-PRA ngaphansi kweziphathimandla zokulawula ze-NRC. 