Application of cooling water supply systems thermography monitoring on the nuclear power plants

Application of cooling water supply systems thermography monitoring on the nuclear power plants was considered in this work. The main purpose was to improve the monitoring techniques of the technical-water supply control system on NPP, and to study the peculiarities of the heat occurrence happened under leakage formation on water level. The determination technique of painted coating peeling initial stage was developed. The temperature fields of spray ponds shields and pumping facility were measured and numerically analysed using fractal and segmentation methods. Possible mechanisms for the heat occurrence on a soil surface were discussed. The fractal dimensions fields of noises were built. Increasing of NPP safety requirements, caused by the accident on "Fukushima-1" NPP, expected to implement state monitoring methods of equipment, communications and water reserves. Their operability determines both before- the-fact prevention of accidents occurrence and controllability for accident liquidation. Obviously, the variety of emergency and hazardous factors requires using the comprehensive approach to their monitoring based on the use of the modern techniques of measuring physical fields. One of these methods is the thermal imaging control. It is lately used for various technological equipment diagnostics. This paper presents the results of research, which goals were the development and improvement of infrared thermography control methods on the NPPs, particularly to monitor the cooling water supply systems. In this work we conducted fractal analysis to characterize thermograms. We tried to understand new opportunities of such potential processing technique in increasing thermograms' informativeness. The fractal characteristics of thermograms are caused by two main factors (1-6). First, the physical object of research is characterized by fractional dimension, therefore a thermal conductivity values differ from classical ones. Second, existing noise in the thermograms is also fractals. The concept of the fractal nature of thermographic data is still ambiguous, and requires a comprehensive exploration. It is also important to study a multifractal character of a thermal images sequence, because it may give us some information about the dynamics of temperature field. 2. Materials and methods