Monitoring the service life of WWER-440 nuclear power plant steam generators to increase their operating reliability

Two groups of data are monitored for evaluating the fatigue life of steam generators. The first group comprises data characterizing operating load of which the most important are the temperatures and pressures of the coolant in the primary and secondary circuits. The second group is data on the state of material of the steam generator. An analysis was made of operating data collected from the primary and secondary circuits using the existing systems. The data was entered manually at hourly intervals into operation log-books or was continuously recorded on recording tape. For the evaluation of the life of the steam generator data in such form is of no use. An automatic system of data collection, storage and evaluation for operating parameters has been designed which shall be tested at the V-1 nuclear power plant. (Z.M.)