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Pump unit for nuclear installations

A technology for pumping devices and nuclear facilities, which is applied to components of pumping devices for elastic fluids, pumping devices, pumps, etc., can solve the problems that cannot be eliminated, and achieve the effect of avoiding material contact and minimizing half-frequency whirl

Inactive Publication Date: 2008-07-02
FRAMATOME ANP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the stated problem cannot be eliminated by this measure

Method used

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  • Pump unit for nuclear installations

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Embodiment Construction

[0013] In the pressurized water reactor 10, generally "light" water is used as both moderator and coolant. Therefore, the pressurized water reactor is of the type of light water reactor.

[0014] The pressurized water reactor 10 has two main cooling circuits, a primary cooling circuit and a secondary cooling circuit. The primary cooling circuit 14 is composed of a reactor pressure vessel 12 including a reactor core, a main coolant pump 16 , a steam generator 18 , and piping for connection. Furthermore, a pressure vessel 20 is provided in a known manner.

[0015] The main coolant pump 16 delivers the coolant (purified water, approximately 290° C.) into the thick-walled reactor pressure vessel 12 made of steel, where it flows initially downwards in an annular channel. The coolant is diverted at the bottom of the vessel and then flows from the bottom up around the fuel rods in the reactor pressure vessel 12 . Here, the coolant cools the fuel rods, whereby the coolant is heated...

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Abstract

A pump unit for a nuclear installation, for example a pressurized water reactor, contains a vertical shaft, which is guided through at least one journal bearing. The journal bearing or bearings is or are configured as a spiral groove bearing or bearings, to prevent shaft vibration caused by the bearings and to increase the service life of the pump unit. Preferred uses of the pump units include, for example, the coolant pump of a pressurized water reactor and the circulating pump of a boiling water reactor.

Description

technical field [0001] The invention relates to a pump arrangement for nuclear installations, in particular to such a pump arrangement with a vertically oriented shaft (vertical shaft). Background technique [0002] Different pump arrangements are required in nuclear installations, for example coolant pumps for pressurized water reactors or circulation pumps for boiling water reactors. Such pump devices are generally designed with large dimensions, have a vertically oriented shaft and must meet the highest quality requirements with regard to output power and durability, especially for reasons of technical safety. [0003] In machines with a vertically oriented shaft (the shaft is guided by plain bearings and on which, as is usually the case in axial and semi-axial pumps, there is low radial hydraulic force), the known It is the vibration of half-frequency whirl (Halbfrequenzwirbel) (also often called ω / 2 whirl). Such periodic excitations lead to rough running, which can al...

Claims

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Application Information

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IPC IPC(8): G21D1/04F04D29/04F16C33/10F16C17/14
CPCF04D29/0413G21D1/04Y02E30/40Y02E30/00Y02E30/30
Inventor 京特·舒尔茨海因茨·克特尔马克斯·黑勒
Owner FRAMATOME ANP
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