NOVELTY - A fuel cell system (100) comprises a cooling apparatus (50), which is installed at an anode inlet line (31), and which reduces a temperature of a hydrogen-containing gas; and a moisture removing device (60) that removes moisture from the hydrogen-containing gas.    USE - Used as fuel cell system.    ADVANTAGE - When the fuel cell system is shut down, leeching of acid contained in the MEAs is prevented. The high temperature fuel cell system has increased moisture removal efficiency; and effectively removes water vapor from hydrogen containing gas entering a fuel cell stack when the operation of the fuel cell system is stopped. The lifetime of the high temperature electrolyte membrane is increased.    DETAILED DESCRIPTION - A fuel cell system having a cooling apparatus comprises:    (1) a fuel cell stack (20) including membrane electrode assemblies (MEAs), each having an anode electrode and a cathode electrode on opposing surfaces of an electrolyte membrane containing acid and conductive plates contacting each electrode;    (2) an anode inlet line, which is connected to the fuel cell stack, and which supplies a hydrogen-containing gas to the anode electrode;    (3) an anode outlet line, which is connected to the fuel cell stack, and which discharges byproducts produced at the anode electrode along with un-reacted hydrogen-containing gas;    (4) a cathode inlet line, which is connected to the fuel cell stack, and which supplies oxygen to the cathode electrode;    (5) a cathode outlet line, which is connected to the fuel cell stack, and which discharges byproducts produced at the cathode electrode along with un-reacted oxygen;    (6) a cooling apparatus, which is installed at the anode inlet line, and which reduces a temperature of the hydrogen-containing gas; and    (7) a moisture removing device that removes moisture from the hydrogen containing gas.    An INDEPENDENT CLAIM is also included for the operation of a fuel cell system having the cooling apparatus, comprising shutting down the fuel cell system by reducing the temperature of the hydrogen containing gas by passing the hydrogen containing gas through the cooling apparatus; and operating the fuel cell system by supplying the hydrogen containing gas to the fuel cell stack without passing the hydrogen containing gas through the cooling apparatus.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram showing the configuration of a high temperature fuel cell system.    Fuel cell stack (20)    Anode inlet line (31)    Cooling apparatus (50)    Moisture removing device (60)    Fuel cell system (100)