A standby gas treatment (SBGT) system is part of the secondary containment system of a nuclear power plant. When called upon to operate, the SBGT system filters and pumps air from secondary containment to the environment and maintains a negative pressure within the secondary containment in order to limit the release of radioactive material.
Each SBGT train generally consists of a mist eliminator/roughing filter; an electric heater; a prefilter; two absolute (HEPA) filters; an activated charcoal filter; an exhaust fan; and associated valves, ductwork, dampers, instrumentation, and controls. The signals that trip the SBGT system are plant-specific; however, automatic trips are generally associated with the electric heaters and a high temperature condition in the charcoal filters.
Read more about this topic: Nuclear Reactor Safety Systems
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