Failure analysis of dual redundant controllers and designs for high reliability
ZHOU Shuqiao, LI Duo
Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Abstract：Redundant controllers are widely used in control systems of nuclear-powered facilities requiring high reliability. The reliability of dual-redundant controllers is improved by analyzing the controllers' possible working states in a state transition diagram. The two critical circumstances where the reliability is impaired are failures caused by dual-master collisions and the loss of redundancy resulting from the failure of a stand-by unit. To avoid these critical circumstances, this paper presents a redundant controller scheme with dual dedicated communication paths using heartbeat double checking and slave reporting. A Markov-chain model was developed to evaluate the reliability of redundant controllers and the effectiveness of this scheme. The results show that this redundant controller design significantly improves the reliability with a three orders of magnitude reduction of the failure rate.
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ZHOU Shuqiao, LI Duo. Failure analysis of dual redundant controllers and designs for high reliability. Journal of Tsinghua University(Science and Technology), 2017, 57(4): 399-404.
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2017, Vol. 57 
