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Published in:
2023 | OriginalPaper | Chapter
Study on High Flux at Shutdown Alarm Setpoint Automatic Update Logic
Authors : Wen-Qing Yang, Xiao-Fei Li, Wen-Qian Liu, Chao Wang, Bo Lv, Ji-Kun Liu, Hao Luo
Published in: New Energy Power Generation Automation and Intelligent Technology
Publisher: Springer Nature Singapore
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Abstract
The source range of the nuclear instrumentation system (RPN) is used to monitor the reactor neutron flux from shutdown to initial startup. When the count rate measured by source range detector is higher than the set value, a “high flux at shutdown alarm” will be triggered. This alarm alerts the operators that positive reactivity has been added to the core, such as unexpected dilution or control rods withdrawal. This paper analyzes the source range high flux at shutdown alarm setpoint update logic of a nuclear power plant. It is found that the setpoint will be updated to a low value after the source range is automatically put into operation, resulting in false triggering of the alarm. This paper discusses the avoidance measures of alarm false triggering from the perspective of operational administration and control logic optimization. The results show that both measures are feasible.