Within the nuclear power industry , the U.S. Nuclear Regulatory Commission began using PRA methods including FTA in 1975 , and significantly expanded PRA research following the 1979 incident at Three Mile Island . This eventually led to the 1981 publication of the NRC Fault Tree Handbook NUREG &ndash; 0492 , and mandatory use of PRA under the NRC 's regulatory authority
Three Mile Island
Three Mile Island accident
Fault tree analysis