A comparative study of the physics properties of a DAYA BAY like PWR model, with Uranium assembly, U Pu assembly or Th Pu assembly in it, has been made using CASMO4E and SIMULATE3 codes. The parameters such as the exposure of each assembly, the core average exposure, fuel temperature coefficient and its variation as a function of operation period have been investigated. Results show that the neutron properties of Th Pu core and Uranium core are similar, and the Th Pu core can burn numerous weapon grade Pu with higher efficiency.
