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ICARUS T600 liquid argon time projection chamber is the first large masselectronic detector of a new generation able to combine the imagingcapabilities of the old bubble chambers with the excellent calorimetric energymeasurement. After the three months demonstration run on surface in Paviaduring 2001, the T600 cryogenic plant was significantly revised, in terms ofreliability and safety, in view of its long-term operation in an undergroundenvironment. The T600 detector was activated in Hall B of the INFN Gran SassoLaboratory during Spring 2010, where it was operated without interruption forabout three years, taking data exposed to the CERN to Gran Sasso long baselineneutrino beam and cosmic rays. In this paper the T600 cryogenic plant isdescribed in detail together with the commissioning procedures that lead to thesuccessful operation of the detector shortly after the end of the filling withliquid Argon. Overall plant performance and stability during the long-termunderground operation are discussed. Finally, the decommissioning procedures,carried out about six months after the end of the CNGS neutrino beam operation,are reported.

Operation and performance of the ICARUS-T600 cryogenic plant at Gran Sasso underground Laboratory