Fault tree synthesis for sequential control circuit based on automatically searched signal path --application of the fault tree synthesis system to complex system--

摘要

Chemical plants and nuclear power plants have been safeguarded hy protective instrumentation systems which are usually equipped with sequential control circuits. The control circuits in automatic protective system are required to achieve theobject in case of emergency that will occur in plants. And sequential control circuits play a very important role in system which deal with the complex signal such as stand by safety system.In last paper, we have proposed the basic algorithm which searches signal path for sequential control circuit and constructs the fault tree and developed the fault tree synthesis system. In this paper, this system is illustrated for more complex systemand clarified the effectiveness and the applicability of proposed method. This system is applied to Core Spray System Auto Initiation Circuit in the Browns Ferry Nuclear Plant and is shown to he successfully applied to the synthesis of fault tree forcomplex system.