Natural circulation heat transfer model development over vertical tube bundle in the condensate heat exchanger

Highlights: • SMART plant and TASS/SMR code have been developed by KAERI. • Capability of TASS/SMR code is validated using POSTECH and ITT experimental results. • The code predicts well heat transfer for a vertical tube bundle under natural circulation. • The correlation considering the tube bundle effect improves the prediction of the heat transfer. - Abstract: A 330 MWt integral type nuclear power plant, SMART, was developed for electricity generation and seawater desalination. Advanced design concepts were adopted such as an integral arrangement of the major components, and a passive residual heat removal system (PRHRS) to enhance the safety capability. The TASS/SMR code was developed using various thermal-hydraulic models reflecting the design features of SMART, such as the condensate heat exchanger in the passive residual heat removal system. The development and validation of the condensate heat exchanger model were performed using POSTECH and IIT heat transfer test results. The TASS/SMR code predicted well or slightly under-predicted the heat transfer coefficient at the condensate heat exchanger shell side compared with the experimental data. The heat transfer correlation considering the tube bundle effect improved the prediction of the heat transfer for a vertical tube bundle geometry.