Abstract
The major functions and architectures of Computer Based Protection and Control Systems for Nuclear Power Plants are designed nowadays taking into account the following basic ideas:•defense in depth. That is independency, redundancy and diversity. To provide several levels of defense so that failures in equipments and mistakes by people will be covered;•distributability, modularity and flexibility. To cut down the construction costs, provide significant installation time saving and reduce spare part inventory;•fault tolerance, self diagnosis and graceful degradation. To face faults, errors and other anomalous or unexpected behaviours and give practically one hundred percent availability.The functions and the architectures presented in the paper, related to the development of distributed microcomputer based Protection and Control Systems for application to Nuclear Power Plants, are especially tailored for the Italian plants. The project, which is under the responsibility of WESTINGHOUSE, has the participation of various Italian organisations, led by ANSALDO S.p.A./Div. NIRA.
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