Pressurized-water reactor with individually adapted pressure distribution in the coolant

US5617457A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Mingmin Ren · Erlangen, DE
• Jurgen Stabel-Weinheimer · Erlangen, DE

Key dates

• Filing date: Sep 18, 1995
• Grant date: Apr 1, 1997
• Expiry date: Sep 18, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E30/30
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pressure vessel of a pressurized-water reactor has an upper part in which coolant is collected in a plenum. The coolant enters the plenum through a grid plate on which tops of the fuel assemblies are supported and the coolant is removed from the plenum laterally. Support columns and control-rod guideways form obstacles to the flow of the coolant which can lead to damming-up below the grid plate with horizontal pressure differences and corresponding horizontal flows. Throttle plates inserted in the top of the fuel assemblies or throttle inserts in apertures in the grid plate produce a uniform pressure in the coolant below the grid plate so that it flows uniformly and in a vertical direction through the individual fuel assemblies.