Structural Material Anomaly Detection System Using Water Chemistry Data, (VIII). Water Chemistry Simulator and Its Application to Resin Intrusion.:Water Chemistry Simulator and Its Application to Resin Intrusion

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A water chemistry simulator has been developed for quantitative evaluation as one function in a water chemistry diagnosis system. The primary cooling system is divided into 18 regions. The model can handle 29 species. The simulator makes it possible not only to evaluate the short term effect of an anomalous event on water quality, but also to evaluate the long term effect on dose rate around primary cooling pipings. Cation resin intrusion was evaluated as an application of the water chemistry simulator. The decomposition rate constant for the cation resin was experimentally evaluated. When cation resin intrusion of 10 ppb from the condensate demineralizer was assumed, reactor water pH decreased from 7.01 to 5.75. Lowered pH during the following 5, 000 EFPH operation without' corrective actions led to about a 50% increase in the <SUP>60</SUP>Co amount on PLR piping as a long term effect.