Heavy water reactor nuclear power unit fuel channel leakage positioning device

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 device which comprises a clamp, an outer sleeve and an inner sleeve. A groove is formed in one side of the clamp and used for clamping a target pipeline to be cooled, a cavity is formed in the clamp, the cavity surrounds the periphery of the groove in a semi-surrounding mode and is close to the bottom of the groove, a connecting hole is further formed in the cavity, one end of the inner sleeve penetrates through the connecting hole and extends into the cavity, and the part, close to the clamp, of the outer sleeve is arranged outside the inner sleeve in a sleeving mode. One end of the outer sleeve is fixedly installed in the connecting hole, the inner sleeve penetrates out of an outlet between the two ends of the outer sleeve, the outer wall of the inner sleeve and the outlet are sealed, and the freezing efficiency and the freezing effect of a conn