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Published in:
2017 | OriginalPaper | Chapter
Research and Improvement of TG Equipment Load Shedding Control Scheme in Nuclear Power Plant
Authors : Le-Yuan Bai, Xu-Feng Wang, Gang Yin, Bin Zeng
Published in: Nuclear Power Plants: Innovative Technologies for Instrumentation and Control Systems
Publisher: Springer Singapore
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Abstract
Once the emergency diesel generator in operation in CPR1000 nuclear power plant (NPP), the selected equipment reloads in the pre-specified sequence after load shedding, and the important equipment should reload preferentially and successfully. This paper finds that the load shedding command for turbine and generator (TG) equipment is from non-classified turbine control system (NC-TCS) to motor control center (MCC) in a CPR1000 NPP. There is a risk that the more important equipment might fail to reload if TG equipment load shedding fails in case TCS system out of order. This paper adds a new TG load shedding path from class 1E distributed control system (1E-DCS) to MCC, and realizes the hard priority logic of TG load shedding by MCC control loop, increasing the reliability of TG load shedding command and eliminating the influence on other more important equipment. The improvement scheme proposed in this paper enhances the safety of NPP and cuts the cost of nuclear power engineering.