Heavy water reactor nuclear power unit fuel channel leakage positioning method

The invention belongs to the technical field of nuclear power, and particularly relates to a heavy water reactor nuclear power unit fuel channel leakage positioning method. According to the method, the total flowing time of the gas in the annular space gas system is obtained through the tracer gas, and the pipeline chain with leakage and the time of leaked water vapor flowing from the leakage position to the downstream position are determined by blocking gas inflow of each channel chain and carrying out dew point detection on the downstream position of the annular space gas system in real time; and the leaked fuel sleeve is accurately positioned according to the two durations, complex operation is not needed, the positioning accuracy is ensured, conditions are created for follow-up pressure pipe replacement and leakage elimination, and economic losses caused by the fact that a leakage channel cannot be effectively positioned in a power station are reduced. 本公开属于核电技术领域，具体涉及一种重水堆核电机组燃料通道泄漏定位方法。本公开通过示踪气体获取了气体在环隙