In-core guide tube restraint for a boiling water reactor

Details In-core guide tube restraint for a boiling water reactor In-core guide tube restraint for a boiling water reactor

1998-02-02

1999-11-30

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Core restraint means

376286, 376277, G21C 900

Patent

active

059955759

ABSTRACT:
A restraint assembly which is a bolted lattice structure for preventing the in-core guide tubes from experiencing excessive flow induced vibrations is described. In one embodiment, the restraint assembly includes upper and lower restraint brackets secured to an in-core housing and in-core guide tube assembly. The restraint brackets are located approximately equal distance from the end supports of the in-core guide tube and in-core housing assembly. The upper restraint bracket is welded between sections of the in-core guide tube, and the lower restraint bracket is welded between the in-core guide tube and the in-core housing. Each bracket includes four flanges, and each flange has tapped, or threaded, openings therein. Each bracket also includes cylindrical sections extending from the flanges, and in one embodiment, the cylindrical sections have inner and outer diameters which match the inner and outer diameters of the in-core housing and the in-core guide tube. The brackets are interconnected by plates and threaded bolts. More specifically, the brackets of each ICGT and ICH assembly are connected to brackets of adjacent assemblies by plates and bolts. The bolts are sized and torqued to ensure that a sufficient preload is maintained to prevent any slippage. The bolt heads are tack welded to the restraint plates after final assembly. The assembly also includes a shroud attachment plate and a restraint support bracket configured to be welded to a shroud.

REFERENCES:
patent: 3682774 (1972-08-01), Beyer
patent: 5912936 (1999-06-01), Charnley et al.

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