Feedwater and condensate flow measurements at Pickering Nuclear Generating Station

Feedwater and condensate flow measurements have been performed on Units 2 and 4 of Pickering Nuclear Generating Station as part of the program to explain a reactor thermal power discrepancy on Unit 2 and to optimize electrical output after Unit 4 retubing. Flow measurements have been carried out using the ultrasonic cross-correlation flow meter and the chemical tracing technique. Results of feedwater flow measurements are compared to station indications on Units 2 and 4 and to the deaerator mass-energy balance on Unit 4. Condensate flows are also compared to the values obtained from direct nozzle pressure measurements. Advantages and disadvantages of each technique are discussed an recommendations are made on improving accuracy of reactor thermal power monitoring and optimization of the electrical output. (author) 4 refs., 4 tabs., 5 figs