Abnormality diagnostic system for reactor recycling pump

The system of the present invention diagnosing the abnormality of a recycling pump in a BWR type reactor objectively and appropriately. That is, in a system for estimating a position where the abnormality occurred by analyzing vibrations of the recycling pump, the abnormality position is estimated by a neural network having vibration intensities on every predetermined frequency regions as the input. In the abnormality diagnosing systems, it has been important how to determine a causal matrix but the causal matrix has been determined by expert's subjective judgment. Further, since the system was not adaptable, it was difficult for the addition of observation data to the data base. However, in the system of the present invention, since the position where the abnormality occurred is estimated by the neural network, the subjective judgment can be excluded. Further, it can also cope with the addition of the data to the data bases. (I.S.)