Apparatus for emergency cooling of the steam generator unit of a nuclear power plant
AssigneeBabcock-Brown Boveri Reaktor GmbH
InventorMax Stiefel
Life of this patent
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Abstract
An arrangement for the emergency cooling of the steam generator unit is of a pressurized-water nuclear power plant is disclosed. Steam is passed through a blow-off pipe (11) into a closed vessel (14) having a water space (12) and a gas space (13). A nest of heat exchanger tubes (15) extends through the water space (12) in a heat transfer relationship to cool the water space. Steam is dumped under emergency conditions into the vessel via a steam distributor nozzle (18) operatively connected at the end of the blow-off pipe and is condensed in the water space. The steam distributor nozzle is arranged essentially below and to the side of the nest of heat exchanger tubes to enhance mixing heat transfer. The resulting condensate is returned to the steam generator as condensate.
Claims8
An apparatus for emergency cooling of the steam generator unit of a pressurized-water nuclear power plant in which steam is passed through a blow off pipe into a closed vessel free from constant make-up water feed lines and wherein the blown off steam is condensed in a closed circuit and the resulting condensate is returned to the steam generator as feedwater, comprising, in combination, a vessel having water space and a gas space;
- a nest of heat exchanger tubes extending through the water space of the vessel;
- a steam distributor nozzle at the end of the blow-off pipe submerged in the water space having an angularly bent end operatively connected to the blow pipe having nozzle openings therein;
- the steam distributor nozzle is arranged essentially below and to the side of the nest of heat exchanger tubes a flap is rotatably disposed in a holder connected to the steam distributor nozzle in the region of the nozzle openings.
Dependencies are inferred from the claim text.