MAINTENANCE COST EVALUATION OF POWER PLANT CONCRETE STRUCTURES THAT TEMPERS WITH RESULTS OF THE SURVEY AND EQUIPMENT IMPORTANCE

Abstract

 In the operation and maintenance of the power plant, the investigation of concrete is done based on the law. So, the information of concrete structures has been stocked. Using this information, the method of calculating the maintenance cost that was considering the fluctuation of data was proposed. The main result is as follows. 1) The influence by the fly ash and the temperature on the appearance diffusion factor and the density of the surface chloride ion was evaluated. The reinforced concrete corrosion speed was investigated in two or more offshore structures, and it was indicated that it was 1-20μm/year. 2) Using this information, the method of calculating the maintenance cost that was considering the fluctuation of data was proposed. The case study of the maintenance cost was carried out with this technique. It was shown that the maintenance cost was able to be reduced with fly ash as a result of the trial calculation by about 10 percent, and the maintenance cost changed by about three times by the change of the reinforced concrete corrosion speed. 3) Moreover, it was shown to be able to reduce the maintenance cost by doing the maintenance management according to the importance in the power plant composed of two or more structures.
 Thus, it becomes possible to improve the accuracy of the deterioration prediction by evaluating the survey data enough, and, consequently, the maintenance cost can be decreased.