Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (4): 40603-040603.doi: 10.11889/j.0253-3219.2015.hjs.38.040603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Redundant state monitoring of the HA devices in reactor I&C system

ZHANG Ning1,2 WANG Quanquan1,3 GUO Bing1,2 SUN Xuejing1,2 XU Haixia1,2 CHEN Yongzhong1,2   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China) 3(University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2014-11-26 Revised:2015-01-06 Online:2015-04-10 Published:2015-04-09

Abstract: Background: Redundancy configuration is widely adopted in the digitalized instrumentation and control (I&C) system of third-generation reactors. For further availability improvement, state monitoring method of redundant configured Programmable Logic Controller (PLCs) and Input/Output Controller (IOC) components in Experimental Physics and Industrial Control System (EPICS) based I&C system prototype was studied for the Thorium Molten Salt Reactor (TMSR) project. Purpose: In order to avoid serious consequence or potential risks caused by switch-over or redundancy failure, the running states of redundant units composed high availability (HA) devices in reactor I&C system are expected to be accessed in real-time in this study. Methods: By means of adding the unit state reporting channels which could be transferred into Process Variables (PVs) for the acquisition of EPICS upper tier application, a novel method of monitoring redundant states of device units was developed. Source code of redundant monitor task (RMT) was modified by adding a routine to record state-related information for the IOC pairs whilst a new state-read program block for local and remote units was developed for PLCs. All state monitoring related variables was acquired and passed into EPICS records by IOC driver. In terminal layer, a CSS (Control System Studio)-based OPI (Operator Interface) Plug-In was implemented for on-line state monitoring. Results: Redundant state-related information of each unit pair were successfully acquired as PV values and showed in the designed OPI interface by proposed method. Test proved it could achieve real-time monitoring of redundant state variation. Conclusion: By developing and modifying program for HA units, and designing OPI interface, reactor I&C system could monitor redundant unit state for a long-term with few additional system resources. It could provide technological support for further improvement of availability of the reactor I&C system.

Key words: Redundancy, Distributed Control Systems (DCS), Experimental Physics and Industrial Control System (EPICS), High availability, State monitoring