The CORCA-3D software is an advanced nodal method core three-dimensional few group neutronics calculation software independently developed by Nuclear Power Institute of China.Improving the running speed of CORCA-3D software can improve the efficiency of reactor system analysis.At present,CORCA-3D software runs in a single thread mode and does not make full use of the multi-core hardware resources of computers.Through the performance analysis of the CORCA-3D software,it is found that there are hot functions with long running time and low CPU utilization.Therefore,parallel programming technology can be introduced to acceler-ate the calculation of CORCA-3D software.This paper applies OpenMP programming technique to the CORCA-3D software,and introduces the design and implementation of parallel optimization of CORCA-3D software.Through the test of the whole core of Unit 1 of Fangjiashan NPP,it is proved that the parallel programming technique can greatly improve the operation efficiency of the CORCA-3D software,the average acceleration ratio is about 2.The application of this parallel programming technique provides technical support for subsequent core numerical software applications.
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