Development status of reactor physics codes in cosine project

COre and System Integrated Engine for design and analysis (COSINE) is the newly approved NPP software R and D key project in China. This paper gives an overview of the COSINE code package, especially the reactor physics subsystem. The code architecture, the theoretical physics model and the current progress are introduced. A brief summary behind the code package is outlined. The detailed discussion here is limited to the lattice physics code (LATC), core analysis code (CORE) and neutron kinetics code (KIND) which are currently under development