Mounting method for core internals
AssigneeHitachi, Ltd.
InventorsMasataka Aoki, Junichi Kawahata
Life of this patent
Estimating the term…
Abstract
An old core shroud (11) and an old jet pump (16) received in a reactor pressure vessel (1) are cut and carried out. A module of core internals having a new core shroud (N11), a new jet pump (N16) and a new baffle plate (N29) integrated is carried into the reactor pressure vessel (1) in which an old baffle plate (28) and an old shroud support cylinder (13) welded and fixedly secured to the reactor pressure vessel (1), and an old shroud support leg (12) fixedly secured to said old baffle plate (28) and said old shroud support cylinder (13) are left. Then, the new baffle plate (29) is fixedly secured to the old baffle plate (28), and the new core shroud (11) is fixedly secured to the old shroud support leg (12).
Claims4
A mounting method for core internals, comprising the steps of:
- carrying an integrated module of core internals having a new core shroud, a new jet pump and a new baffle plate into a reactor pressure vessel in which an old baffle plate and an old shroud support cylinder welded and fixedly secured to the reactor pressure vessel and an old shroud support leg fixedly secured to said old baffle plate and said old shroud support cylinder are left;
- fixedly securing said new baffle plate to said old baffle plate;
- and
- fixedly securing said new core shroud to said old shroud support cylinder.
A mounting method for core internals, comprising the steps of:
- cutting an old core shroud and an old jet pump from an old shroud support cylinder and an old baffle plate and carrying the old core shroud and the old jet pump out from a reactor pressure vessel;
- carrying an integrated module of core internals having a new core shroud, a new jet pump and a new baffle plate into the reactor pressure vessel in which the old baffle plate and the old shroud support cylinder welded and fixedly secured to the reactor pressure vessel, and said old baffle plate and said old shroud support cylinder are left;
- fixedly securing said new baffle plate to said old baffle plate;
- and
- fixedly securing said new core shroud to said old shroud support cylinder.
Dependencies are inferred from the claim text.