EMC test and design of I and C system in nuclear power plants

Based on wide application of digital Instrument and Control System (I and C) in nuclear power plants, the paper presents how to verify the electromagnetic compatibility (EMC) of digital I and C, and how to improve the EMC of digital I and C. After analyzing the disturbance of I and C in nuclear power plant environment, the paper firstly puts forward the correlative standards and test methods, and then based on the application in a NPP, it describes the synthetical methods to improve the EMC of digital I and C during product and engineering design, such as electromagnetic protection, interference filter, electromagnetic shielding, fault isolation, fault-tolerance design, and environment reforming. (authors)