Mark of the reconstitution process of the surveillance program of the CLV

The surveillance program of the reactor vessel of the nucleo electric central of Mexico it evaluates the mechanical state of the vessel, for it are had surveillance capsules with a series of witness test tubes, subjected to a similar or major neutron flux to that of the vessel. The objective is to evaluate in advance the embrittlement grade of the vessel in its design life. However the number of capsules with the witness test tubes it is only for the design life of the plant and at the moment the nucleo electric plants negotiate an extension of life of these, until for 20 years or more, of there the importance of this witness material that stores the information of the damage accumulated by irradiation. This material requires to be taken advantage after being rehearsed and the normative one settles down as obligatory to qualify the rebuilding process to obtain other 'new' Charpy test tubes that are again introduced in the reactor, reusing this material, as much for the surveillance program as for the extension of the plant life. In this work the qualification of the welding process by 'Stud Welding' for the rebuilding of Charpy test tubes of the surveillance program of the BWR reactor Unit 2 of the Laguna Verde Nucleo electric plant, Veracruz, Mexico is described. (Author)