Device and method for repairing inside of reactor pressure vessel
AssigneesHitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha, Hestec Service Co., Ltd.
InventorsKouichi Kurosawa, Youichi Mahara, Toshiharu Nagashima, Kazuhiro Nitta, Shinji Go, Yoshitoshi Suzuki, Katsuhiko Hirano
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Abstract
An opening portion 3 is produced by cutting a recirculating piping 72 connected to a recirculating nozzle 2 of a reactor pressure vessel 1. A repairing device is brought into an annulus 10 of the reactor pressure vessel 1 from the opening 3, thereby repairing the annulus 10.
Claims7
A method for repairing the inside of a reactor pressure vessel for a boiling water reactor provided with a recirculating nozzle, said reactor pressure vessel and a core shroud disposed inside said reactor pressure vessel defining an annulus surrounded thereby, the method comprising:
- draining coolant in said reactor pressure vessel;
- cutting a recirculating piping connected to said recirculating nozzle to produce an opening connected to said recirculating nozzle;
- bringing a repairing device into said annulus in said reactor pressure vessel from said opening;
- and
- using said repairing device to repair the inside of said annulus.
Dependencies are inferred from the claim text.