The application of advanced Main Control Room(MCR) is accompanied with lots of changes and different forms and features through the virtue of new digital technologies. The characteristics of these digital technologies and devices give many opportunities to the interface management, and can be integrated into a compact single workstation in advanced MCR so that workers can operate the plant with minimum physical burden under any operation conditions. However, these devices may introduce new types of human errors and thus a means to evaluate and prevent such errors is needed, especially those related to characteristics of digital devices. This paper reviewed the new type of human error hazards of tasks based on digital devices and surveyed researches on physiological assessment related to human error. An experiment was performed to verify human error hazards by physiological responses such as EEG which was measured to evaluate the cognitive workload of operators. And also, the performances of four tasks which are representative in human error hazard tasks based on digital devices were compared. Response time, β power spectrum rate of each task by EEG, and mental workload by NASA-TLX were evaluated. In the results of the experiment, the rate of the β power was increased in the task 1 and task 4 which are searching and navigating task and memory task of hierarchical information, respectively. In case of the mental workload, in most of evaluation items, task 1 and 4 were highly rated comparatively. In this paper, human error hazards might be identified by highly cognitive workload. Conclusively, it was concluded that the predictive method which is utilized in this paper and an experimental verification can be used to ensure the safety when applying the digital devices in Nuclear Power Plants (NPPs).
The purpose of this study is to develop an active group-view display and evaluate the effectiveness of the prototype to cope with team errors in terms of shared situation awareness. The results of this research provide effective countermeasures that can be used to cope with team errors from the perspective of team communication and contextual situation sharing. To develop the active group-view display, we first investigated hazardous factors that could cause team error based on the team error process; we determined countermeasures to cope with these hazardous factors, validated the countermeasures by scenario-based analysis, developed an active group-view display that adds the function of interaction among operators in nuclear facilities and, finally, validated the effectiveness of the active display in terms of team situational awareness. Based on the team error process, we determined hazardous factors for team error that may occur in the process of using the group-view display. To prevent these hazardous factors, brainstorming with experienced operators is used to establish four countermeasures and three barriers against team error. A laser writing device with the function of pointing and marking information through gestures to the group-view display is proposed. An effectiveness test of team communication and decision making using the active group-view display device is performed using SACRI. The results of the test show a significant difference between active and passive displays. This study suggests that an improved interface using an active group-view display device can be utilized as a countermeasure against team errors. In order to cope with human errors that may occur in a digital control room, it is necessary to prepare countermeasures through systematic analysis of various interfaces such as computer-based procedures, digitalized alarm indicators, and mimic-based displays in nuclear power plants.
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