In the course of the optimization of the AP-CITROX decontamination technology the effects of the different flow rates of the decontamination solutions on the corrosion state of stainless steel tube samples originating from steam generators of Paks NPP were studied. A pilot-plant circulation system was developed to examine the effect of various technological parameters such as flow rate, contact time, chemical concentration and temperature. The experiments were carried out in the flow rate range of 0.5 - 2.89 m/s, in one or two consecutive decontamination steps. The results of the voltammetric and ICP-OES studies have revealed that (in order to improve the passivity of the surfaces) the flow rate should be kept as low as possible (0.5 m/s) during the passivation (in the 6-8 steps). To evaluate the necessary number of the decontamination cycles, it is advisable to perform an overall estimation on the corrosion state of the steam generators (i.e. to prepare a so-called "corrosion map" of the steam generators).
|Translated title of the contribution||Hydrodynamic study of the effectiveness of a decontamination technology utilized for steam generator, II. Analysis of the corrosion state of the tube samples|
|Number of pages||7|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Mar 1 2002|
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