Daga watan Oktoba 1991 zuwa Disamba 1992 shi ne OOO Transvostok Technical and Production Department Director. Daga Janairu 1993 zuwa Afrilu 1995 shi ne LLC ESTE General Director. A watan Oktoba 1995, Kornienko ya fara aiki a Energia Rocket / Space Corporation (RSC) a matsayin injiniya. An sanya shi tare da bunkasa takardun fasaha don gwajin farko na cosmonaut da kuma goyon baya da kuma horo. Ya shiga cikin gwajin EVA a cikin simintin nauyi-sifili a hydrolab da kuma a Selen dynamic stand. A yayin wannan aikin ya sami kwarewa a cikin shirya gyare-gyare na gyare-gyare / gyare-gyare da kuma ayyukan haɗuwa a kan tashar tashar MirSC. Ya kuma shiga kai tsaye a gwajin R Energia a filin gwaji. Tambaya: A wace shekara ne Kornienko ya fara aikinsa a RSC?
Shekarar 1995