A SCRAM is a rapid shutdown of a nuclear reactor whereby control rods are inserted between the fuel rods in the reactor core to discontinue the fission reaction. The SCRAM is actuated manually by an operator or automatically when parameters are exceeded. When control rods are inserted, radioactive coolant is displaced by the rods and routed to a storage tank. This "hot" coolant is later processed and routed back to the recirculation system.
Level instrumentation in the Discharge Volume Tank is an important control in the Reactor Protection System (RPS). The level controls must be approved for radioactive service in a steam environment. Conventional float switches are frequently specified as they meet these requirements with high reliability.
Consult factory for Nuclear Qualified instruments and specific model codes.