Algorithm Research of the ICCMS for Qinshan Phase II NPP Based on FirmSys Platform

The ICCMS is a safety level system, which monitors the cooling state of reactor core and the water level of reactor pressure vessel. The ICCMS of Qinshan Phase II NPP has been running for over ten years since combined to the grid, and the algorithm of the original system is only for traditional simulation system. There is no algorithm for digital control system. So it needs to design and development new algorithm for new ICCMS system to solve it. This paper mainly introduces the design process of the algorithm in new ICCMS system; it has three parts which are core temperature measurement, core cooling monitoring, and the water level of reactor pressure vessel measurement. The overall algorithm is split into twelve subroutines which are called through a root program by modularization method. It is not only a suitable solution for ICCMS system of Qinshan Phase II NPP but also can be used for reference of the design of core cooling monitoring system for PWR nuclear power station under EOP regulations. At present, the modified ICCMS system is running well. It proves that the new algorithm designed is fully complies with the original operating procedures.