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Main Steam

Main Steam


The Main Steam System transports high pressure, superheated steam from the NSSS to the Steam Turbine. The piping and valves are sized and routed in such a manner that there is minimal pressure loss but flexibility to compensate for expansion due to the heat added from the steam’s operating temperatures. This includes a bypass system that routes the steam directly to the condenser during startup and to permit the reactor to maintain load for an indefinite amount of time in the event of a turbine trip.



Design Pressure: 475 psig
Design Temperature: 600 deg F
Design Flow Rate: 1,450,000 lb/hr
Material: A335 GrP11
Size: 24 inch NPS

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