An application of dynamic safety system to pressurized water reactor

Abstract-The dynamic safety system (DSS) is a computer based reactor protection system that has dynamic self-testing feature and fail-safe nature inherently. The dynamic self-testing and fail-safe features provide a high level of reliability and low spurious trip rate. The time and human efforts maintaining the system can also be reduced by virtue of those features. In order to apply the DSS for PWR, however, some modification is required because there exist many differences between PWR and AGR for which the DSS was first tested and installed. These differences are trip algorithms, monitored parameters, trip logics, and other conditions. In this work, the DSS algorithm is modified for PWR. The modified DSS has several new features which are required for applying DSS technology to PWR. Then, the modified DSS is implemented in a programmable logic controller (PLC) and tested. It is shown that, from the results, the modified DSS generates correct output in all test cases