March 28, 1979, qalabka oo shaqeyn waayay iyo qaladka hawl wadeenka ayaa sababay in la waayo qaboojiyaha iyo in qayb ka mid ah ay dhalaasho warshadda tamarta nukliyeerka ee Three Mile Island
waxay ku taalaa Pennsylvania. Khaladaadka farsamada waxaa sii xumeeyay fashilka bilowga ah ee hawlwadeennada warshadda si ay u aqoonsadaan xaaladda inay tahay shil luminta qaboojinta sababtoo ah tababar aan ku filnayn iyo arrimo aadane, sida isdhexgalka aadanaha iyo kumbuyuutarka naqshadeynta kormeerka la xiriira tilmaamayaasha qolka kontoroolka ee aan caddayn ee ku jira isdhexgalka isticmaalaha warshadda korontada. Gaar ahaan, iftiinka tilmaame qarsoon wuxuu u horseeday hawl wadeenka inuu gacanta ku dhaafo nidaamka qaboojinta degdegga ah ee otomaatiga ah ee fal-celinta maxaa yeelay hawl wadeenka ayaa si qalad ah u rumeysan in biyo qaboojin badan ay ku jiraan fal-celinta oo ay sababeen in cadaadiska uumiga la sii daayo. Baaxadda iyo kakanaanta shilku waxay caddaatay muddo shan maalmood ah, maadaama shaqaalaha Met Ed, saraakiisha gobolka Pennsylvania, iyo xubnaha Guddiga Xakamaynta Nukliyeerka ee Mareykanka (NRC) ay isku dayeen inay fahmaan dhibaatada, la xiriiraan xaaladda saxaafadda iyo bulshada maxalliga ah, go'aan ka gaaraan in shilku u baahan yahay daadgureyn degdeg ah, iyo ugu dambeyntii joojinta dhibaatada. Oggolaanshaha NRC ee sii daynta 40,000 galaan oo biyo wasakh ah oo shucaaca leh si toos ah webiga Susquehanna waxay keentay luminta kalsoonida saxaafada iyo bulshada.