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In this paper we propose the nondestructive determination of the deuterium content from the pressure tubes using a classical eddy current multi frequency method. The conductivity of the zirconium alloy is determined by inversion, the influence of ZrO layer being eliminated. The developed model, the inversion method and the comparing of prediction - experiment are presented, the data obtained experimentally validating the proposed method. Measuring the modification of the impedance of an eddy current transducer with unique coil , and utilizing a simple inversion procedure starting from a linearized model, it is possible to determine the conductivity of the Zr2.5 % alloys used in the fabrication of the pressure tubes from the nuclear PHWR power plants, with different hydrogen contents. When the electrical conductivity of the alloys exceeds a threshold value of 1.68MS/m, the development of the Zr hydrides oriented after a circumferential direction pressure tubes walls is possible. If the electrical conductivity exceeds 1.61MS/m, the Zr hydrides start to change orientation after radial direction. In this situation, blisters and hydrogen delayed cracking is possible to appear.