Research on Novel Televisual Automatic Inspection Methods For CPR1000 Steam Generator Secondary Side

Steam generator is a vital component which is the boundary between the first loop and second loop. It is very essential to know steam generator's sludge amount and distribution to monitor its healthiness. It is preferable to use televisual method than eddy current to inspect sludge. Although tubesheet televisual inspection has been done manually every outage, however, this is not enough for monitoring the condition of steam generator continually. Automatic inspection methods for tubesheet, the first support plate, the second support plate and the 9th support plate were required and illustrated in this paper. They are all the areas that can be allowed to be inspected within the structure of CPR1000 steam generator. For every method, principle, equipment, inspection feedback and some inspection results were described. In addition, a new eddy current method was also introduced to cooperate with the televisual methods mentioned above to know the overall sludge. This is a new tendency of estimation of steam generator's healthiness.