Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (4): 40401-040401.doi: 10.11889/j.0253-3219.2015.hjs.38.040401


EPICS redundancy technology based on PRP

LIU Shaohai1,2 CHEN Yongzhong1,3 HAN Lifeng1,3   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China) 3(Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China)
  • Received:2015-01-19 Revised:2015-03-02 Online:2015-04-10 Published:2015-04-09
  • Contact: Yongzhong Chen

Abstract: Background: Redundancy technology can be used as an effective solution to improve the reliability of Experimental Physics and Industrial Control System (EPICS) applied to nuclear reactor, and the most popular redundancy method is a standby mode with the switching time less than 1 s. Meanwhile, the Parallel Redundancy Protocol (PRP) released in standard IEC62439-3 is proposed as a possible solution to provide zero switching time in case of a single-point failure. Purpose: In order to further improve the reliability of EPICS to fulfill the high-reliability requirements of the redundancy control network in nuclear reactor, the "parallel" redundancy mode elaborated in PRP is applied to the nuclear reactor. Methods: The feasibility of EPICS achieving a high reliability based on PRP technology is analyzed, and a software implementation example of Channel Access (CA) protocol of EPICS has been developed over Linux based on PRP which implemented on the application layer. Results: Test results show that the high-reliability requirements of completely seamless switchover can be realized when a single-point failure occurs in the redundant network. Conclusion: With the proposed implementation plan, the redundant EPICS can be employed to achieve a high-reliability network for nuclear reactor.

Key words: Parallel Redundancy Protocol (PRP), Nuclear reactor, Experimental Physics and Industrial Control System (EPICS), Network redundancy, Reliability