Calculating Boundary Conditions to Determine the Heat State of High Pressure Rotor of the Turbine NPP K-1000-60/3000

To extend the operation life of the turbine of nuclear power plant the range of work should be done to evaluate the technical state of turbine, in particular to detect and analyze the defects, carry out investigation into the causes of a failure and the mechanisms of their appearance and possible development. The residual life is also assessed and the recommendations on the control of ageing are given to provide reliable and safe turbine operation during the period exceeding the design service life. One of the methods of estimation of the residual life is the use of the software based on the finite-element method of the solution of differential equations with partial derivative and also integral equations. This scientific paper gives the computation data for boundary conditions obtained to define the heat state and estimate the operational life of high pressure rotor using the software based on finite-element method. The high-pressure rotor was conventionally split into specific sections for which the coefficients of heat transfer from the steam medium to the rotor body were defined depending on the standard schedule of the cold, warm and hot starts-up of the turbine.