Reactor protective system
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A reactor protective system (RPS) is a set of components in a nuclear power plant designed to safely shutdown the reactor and prevent the release of radioactive materials. The system can "trip" automatically (initiating a Scram), or it can be tripped by the operators. Trips can occur for a wide variety of reasons, including strong vibrations and failure of critical sensors.
In non-Soviet plants, the reactor scrams automatically if the two redundant channels of the RPS are damaged or disabled.