Actively cooled plasma-facing components and coolant removal system in KSTAR

•KSTAR have been operated the long pulse more than 50 seconds and the first commissioning of active cooling for PFC have been successfully done.•After plasma shot, the temperature of PFC tiles returned quickly to initial temperature and the shot interval time is reduced.•The coolant removal system is consist of adsorption dryer with 3000Nm3/hr of flow capacity.•The PFCs baking was well operated. The PFCs baking and cooling operation was well done at a time to maintain of lower vacuum pressure, to remove the water of vacuum vessel and for cooling of PFCs.•The performance and operation period of coolant removal system can be confirmed.