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Evaluation of operator support system from the perspective of reducing human error probability   ZHANG Yuxin1, and YANG Ming1,2   1. College of Nuclear Science and Technology, Harbin Engineering University, No.145 Nantong Street, Harbin 150001, China (zhangyuxin@hrbeu.edu.cn) 2. School of Electric Power, South China University of Technology, No.381 Wushan Road, Guangzhou 510641, China (corresponding author: myang.heu@gmail.com)   Abstract: Human error is considered as a major contributor to the historical events and accidents in nuclear power plants. Various operator support technologies have been proposed and developed so far, however, only a few of them have been applied in practice because nuclear industries hold a conservative view on the introduction of intelligent technologies into main control rooms to aid decision-making of operators. Since the development of a fault-free software product is impossible, the most basic requirement for the application of a theoretically imperfect operator support system is expected so that further increase of the possibility of human error occurrence should be avoided. This paper takes the operators starting Chemical and Volume Control System (RCV or CVCS) by soft controls in advanced main control room as an example to demonstrate the role of an Operator Support System (OSS) in human error reduction and the its potential problems in misleading operators. The analysis results show that a systematic trade-off analysis should be made for an OSS before it is introduced into the main control room and human error analysis technologies can serve for this purpose.   Keyword: advanced main control room; soft control; operator support system; human error; nuclear safety
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