Method for repairing guide rails of an assembly radially maintaining a support plate of a pressurized water nuclear reactor core
AssigneeAreva Np
InventorsStephane Guironnet, Daniel Grypczynski, Mirco Fabris
Life of this patent
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Abstract
The invention concerns a method for repairing guide rails (27) of an assembly (10) radially maintaining a core supporting plate (5), which consists in measuring the spacing between the spans of the lateral branches of the guide rail (27) to be repaired, cutting and removing at least one lateral branch of said guide rail (27) to be repaired, measuring the dimensions of said lateral branch and machining with identical dimensions at least one substitution lateral branch, mounting and fixing said substitution lateral branch and measuring the spacing between the spans of the lateral branches of the repaired guide rail.
Claims7
Method for repairing the slides (27) of a radial support assembly (10) for a pressurized water reactor core support plate (5), each slide (27) of U-section being fixed in a housing formed in a side support (26) integral with the reactor vessel (1) and comprising two essentially parallel lateral branches (27b) equipped with opposing bearing surfaces (27c) designed to collaborate with the lateral faces of a radial support key (15) fixed to the core support plate (5), wherein:
- the separation between the bearing surfaces (27c) of the lateral branches (27b) of at least one slide (27) that is to be repaired is measured,
- a relative measurement of the position of the said at least one slide (27) that is to be repaired with respect to the other slides (27) of the support assembly (10) is taken,
- at least one lateral branch (27b) of the said at least one slide (27) that is to be repaired is cut off and removed,
- the dimensions of the said at least one lateral branch (27b) are measured and at least one replacement lateral branch (37b) is machined to identical dimensions,
- open-ended holes (43) intended to accept screw fasteners (44) for screw-fastening the said at least one replacement lateral branch (37b) are pierced in the solid support (26),
- holes (45) are pierced in the said at least one replacement lateral branch (37b) and these holes (45) are tapped to accept the screw fasteners (44),
- the said replacement lateral branch (37b) is fixed in the housing of the solid support (26) using the screw fasteners (44),
- the separation between the bearing surfaces (37c) of the lateral branches (37b) of at least one repaired slide (27) is measured,
- a relative measurement of the position of the said at least one repaired slide (27) with respect to the other slides (27) of the support assembly (10) is taken,
- holes (40, 42) are pierced in the solid support (26) and in the said at least one replacement lateral branch (37b) for positioning and load-reacting pins (41), and
- the said pins (41) are fitted.
Dependencies are inferred from the claim text.