Water quality diagnosis system for evaluation of reactor water impurities

In recent years, the methods of water chemistry control in boiling water reactor (BWR) plants have become more and more complicated because of the increasingly higher purity of water quality as a result of the sophistication of water chemistry control techniques. A water quality diagnosis system has been developed to improve the reliability of and achieve a high level of precision in BWR plant water chemistry control. This paper outlines the water quality diagnosis system and the system for predicting and evaluating the concentration of the various reactor water impurities that damage the reactor internal structural materials, developed as its major configuration section. The water quality diagnosis system identifies the causes of abnormalities through early detection of minute changes in water quality and then offers countermeasures. The characteristic feature of the water quality diagnosis system is the two-stage inference process formed by the anomaly detection section and the detailed diagnosis section