Background: Only the reliability of Rapid Spanning Tree Protocol (RSTP) and some other redundancy protocols is improved when a single-point failure occurs in the network

then the RSTP might be applied to control network of reactor’s digital instrumentation and control system (I&C). The Parallel Redundancy Protocol (PRP) released in standard IEC62439-3 and applied to the intelligent power transducing station is proposed as a possible solution to provide completely seamless switchover in case of a single-point failure. Purpose: In order to fulfill all the high-reliability requirements of redundancy control network

the PRP is applied to the digital I&C of nuclear reactor. Methods: The principle of achievable high reliability and high availability based on PRP are analyzed in detail

and a software implementation of PRP protocol has been developed based on TCP/IP over Linux in the application layer. Results: Test results show that the high reliability requirements of zero self-healing time and zero packet loss can be realized during the simple data transmitting experiments across the various network nodes. Conclusion: The PRP and the peoposed implementation plan can be employed to achieve high reliability control network for nuclear reactor’s I&C system. Abstract