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1. A method for shutting down a water electrolysis system including a water electrolysis apparatus, a gas-liquid separation apparatus, and a water circulation apparatus, the water electrolysis apparatus including a power supply, an anode connected to the power supply, a cathode connected to the power supply, and an electrolyte membrane provided between the anode and the cathode, the water electrolysis apparatus being configured to generate oxygen on a side of the anode side and to generate hydrogen on a side of the cathode at a pressure higher than a pressure of the oxygen through electrolysis of water, the gas-liquid separation apparatus separating unreacted water and produced gas discharged from a water outlet of the water electrolysis apparatus, the water circulation apparatus circulating the water between the water electrolysis apparatus and the gas-liquid separation apparatus, the water circulation apparatus including a return pipe having an on-off valve and connecting the water outlet of the water electrolysis apparatus and the gas-liquid separation apparatus, and a hydrogen exhaust pipe having an exhaust valve and being connected to the return pipe between the water outlet and the on-off value, the method comprising:
shutting down the water electrolysis apparatus while shutting down the water circulation apparatus; closing the on-off valve while opening the exhaust valve; and transmitting hydrogen generated in the cathode to the anode through the electrolyte membrane, and then exhausting hydrogen through the exhaust valve to release pressure in the cathode.
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