m ², ▁the ▁soil ▁was ▁removed ▁with ▁hand ▁tools ▁and ▁sh ipped ▁to ▁the ▁United ▁States ▁in ▁bar rel s . ▁ ▁In ▁ 1 9 6 8 , ▁L ▁Re actor ▁was ▁shut ▁down ▁for ▁up gr ades , ▁and , ▁in ▁ 1 9 7 1 , ▁K ▁Re actor ▁became ▁the ▁first ▁re actor ▁to ▁be ▁controlled ▁by ▁computer . ▁ ▁The ▁site ▁was ▁designated ▁as ▁a ▁National ▁Environment al ▁Research ▁Park ▁in ▁ 1 9 7 2 . ▁▁ 1 9 7 7 ▁saw ▁the ▁startup ▁of ▁the ▁Pl ut on ium ▁F uel ▁Fab ric ation ▁( PU FF ) ▁Fac ility . ▁ ▁The ▁Sav ann ah ▁River ▁Arch ae ological ▁Program ▁( SR AR P ) ▁was ▁established ▁on site ▁in ▁ 1 9 7 8 ▁to ▁perform ▁data ▁analysis ▁of ▁pre histor ic ▁and ▁historic ▁sites ▁on ▁SR P ▁land . ▁ ▁Rem ed iation ▁In ▁ 1 9 8 1 , ▁an ▁environmental ▁clean up ▁program ▁began . ▁M ▁Area ▁S ett ling ▁Bas in ▁clean up ▁began ▁under ▁the ▁Resource ▁Conserv ation ▁and ▁Rec overy ▁Act ▁( RC RA ). ▁The ▁heavy ▁water ▁re work ▁facility ▁was ▁closed ▁in ▁ 1 9 8 2 . ▁Const ruction ▁of ▁the ▁Def ense ▁W aste ▁Process ing ▁Fac ility ▁( D W PF ) ▁began ▁in ▁ 1 9 8 3 . ▁W ack en h ut ▁Services ▁In cor por ated ▁( W SI ) ▁began ▁providing ▁security ▁support ▁services ▁at ▁SR P .