Development of water chemistry data management system and its operational experience

The demands on the water chemistry data management in a nuclear power plant have increased every year to ensure the safe and stabilized operation of the nuclear power plant. To increase the reliability of the fuel and equipment, dose reduction, and reduce radioactive waste are some of its objectives. Chemical data evaluation and diagnosis have been conducted by personnel experienced in water chemistry management. In view of these, we planned the development of data processing system which diagnoses the plant by detecting minute indications at an early stage to support the plant operation division and the chemical engineering division. A prototype system has been introduced into Tsuruga Power Station No. 2 unit (PWR, 1.160 MWe), in 1986. Based on this experience, a new system has been developed for both Tsuruga Power Station No. 1 unit (BWR, 357 MWe) and Tokai Second Power Station (BWR, 1.100 MWe), which diagnose the plants by means of chemical symptoms in addition to the same functions as Tsuruga Power Station unit No. 2 has had. This system has been being under partial operation since Apr. 1993. The development and situation after the introduction are reported as follows. (authors). 1 fig., 1 tab., 2 refs