The present invention relates to a tritium removal system in an exhaust system of a nuclear power plant capable of preventing environmental pollution caused by radioactive elements released to the outside by removing tritium contained in exhaust gas discharged from a heavy water reactor type nuclear power plant As such, An exhaust passage (1) through which polluted air of a nuclear power plant is discharged; A tritium meter (2) for measuring the concentration of tritium in the polluted air flowing into the inlet of the exhaust passage; A branch tube (3) branching from one side of the exhaust passage; A tritium removal device (10) connected to the outlet of the branch pipe and removing the tritium in the polluted air using a cooling condensation method and then sending the tritium to the outlet side of the exhaust passage; A first door (4) and a second door (6) installed at the outlet of the exhaust passage and the inlet of the branch pipe to determine the flow path of the contaminated air; And a control panel (5) for selectively opening and closing the first door and the second door according to the measured tritium concentration and controlling the tritium elimination device. According to the present invention, when the concentration of tritium in the polluted air flowing into the exhaust system of a nuclear power plant is equal to or higher than a certain level, the polluted air is supplied to the tritium eliminating device to remove tritium, whereby only clean air having a concentration of tritium below the target value It is possible to prevent radioactive contamination due to exhaust gas containing tritium.
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