Conference Proceedings Paper
MODELLING OF THE CANDU PRESSURE TUBE DIAMETER EXPANSION
13th International Conference on CANDU Fuel - 2016 Aug. 15-18
J.Y. Jung (KAERI)
W. Hartmann (CANTECH)
Since the pressure tube diametral expansion affects critical channel powers, an accurate prediction of the pressure tube diameter is very important in assessing the operational margin to fuel dryout. This study has focused on the modeling of the pressure tube diameter expansion based on the operating conditions of the neutron flux and the temperature. It is well known that high temperature and neutron irradiation are main parameters affecting the pressure tube deformation. Accordingly, the pressure tube diametral expansion was modeled by using the flux data of each channel and each bundle as well as the measured diametral data of pressure tubes. From the measured data, a strain rate was derived for each measured channel. Specifically, it was derived by using the normalized flux and temperature data for each corresponding channel. Although the basic concept of the modeling is very simple, the developed model shows good agreement with the measured data.
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