The CPR1000 is built and operated by the China Guangdong Nuclear Power Company (CGNPC). The flow features are very complicated and asymmetrical in three dimensions. In this study, we calculated the completed model without symmetry simplification using CFD method. 3-dimensional, global and localized flow distributions of full vessel of CPR1000 PWR including top plenum, upper plenum, lower plenum and flow features under different working conditions for safety analyses have been obtained. Unsymmetrical flow field indicates the necessarily of intact vessel mode calculation and simplifications of guide tubes and core make it possible under the condition of our lab. Thermal hydraulics characteristics are obtained to give reference to safety operation under various operating conditions.

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