Default value realization research of CPR1000 safety classified DCS platform

WANG Shaowei, LI Gongjie, SUN Wei, TIAN Yong

（China Nuclear Power Design Co.,Ltd.(Shenzhen), ShenZhen 518172, China）

Abstract: Aiming at the problems of the safety DCS used in CPR1000 nuclear power plants had no platform function of default value, the signal fault selfdiagnosis mechanism of MELTAC DCS platform was analyzed, signal quality transmitting management was researched, and default value switchover was established as a countermeasure to output disturbing. Meanwhile, because the risk of CPU over load, the scheme was adjusted, the default value realization location was changed from signal input cabinet to command output cabinet or NC DCS gateway. Finally, the scheme base on corporation of signal unavailable diagnosing, signal quality transmitting management and default value switchover was established. The scheme was tested and implemented in multiprojects. The results show that the default value scheme can avoid risk of CPU overload and meanwhile fulfill the requirement of default value function.

Key words: CPR1000; safety DCS; default value