Water-cooled nuclear reactor

US4277310A · kind A · utility

Assignee

• Kraftwerk Union Aktiengesellschaft · DE

Inventors

• Wolfgang Braun · Ditzingen, DE
• Leonhard Irion

Key dates

• Filing date: May 15, 1975
• Grant date: Jul 7, 1981
• Expiry date: May 15, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7839
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A water-cooled nuclear reactor pressure vessel is internally provided with a check valve assembly for the inner end of a coolant inlet nozzle to prevent immediate loss of the coolant from the vessel by backward flow in the event the pressure of the coolant supply through the nozzle, drops below the pressure inside the vessel while the reactor is operating. The valve assembly includes a plurality of flap valves working in parallel so that if one fails to close when required, the balance of the flap valves remain operative to check the discharge of the coolant.