HFC-6000 Automatic Seismic Trip System (ASTS)

摘要

The aftermath of the accident at Fukushima, Japan sent Shockwave to the world. Safety trip systems responding to natural disasters such as earthquakes and tsunamis had quickly become applications with the highest priorities for nuclear power plants in many nations. In South Korea, Automatic Trip Seismic System (ASTS) for all operating power plants were demanded to be commissioned as soon as possible. The objectives for installing these ASTS are two-fold: to provide automation of trip operation, therefore, to enhance the safety operations of nuclear power plants and to improve public acceptance of nuclear power plants. In this paper, the implementation of such a typical ASTS is described including the non-safety seismic class I hardware and the two channel 2oo4 energized actuation application. Background of seismic trip system is discussed in the beginning of the paper. In the system section of the paper, the major units of the ASTS: typical seismic sensors, HFC-6000 controllers, I/O modules, monitoring tools and other supporting software are discussed. The HFC-6000 architecture is consisted of redundant controllers over a set of redundant communication links accessing the I/O modules. Some key design aspects are also discussed. Implementation considerations for these systems by regulatory agencies such as IAEA are discussed. In a conclusion, HFC-6000 ASTS implementation is qualified as Class IE safety system and can be applied to other nuclear power plants as needed.