Jet pump measurement pipe repair method
AssigneeKabushiki Kaisha Toshiba
InventorsYuki Minato, Toshihiro Yasuda, Kunihiko Kinugasa, Hajime Mori, Satoshi Yamamoto, Jun Suzuki, Tadahiro Mitsuhashi
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Abstract
In a jet pump measurement pipe repair method according to the present embodiment, a breakage part of a measurement pipe horizontally fixed to a lower part of a jet pump provided in reactor water in a reactor pressure vessel is repaired. The method has: a step of cutting and removing the measurement pipe including the breakage part; a step of retaining a connection pipe for connecting the remaining measurement pipe on the jet pump by means of a clamp; and a step of connecting ends of the remaining measurement pipe by means of the connection pipe.
Claims4
A jet pump measurement pipe repair method for repairing a breakage part of a measurement pipe which is horizontally fixed to a lower part of a jet pump provided in reactor water in a reactor pressure vessel, the method comprising:
- cutting the measurement pipe including the breakage part;
- cutting a support member supporting the measurement pipe to a diffuser of the jet pump;
- removing part of the measurement pipe and part of the support member;
- fixing, by a clamp, a spool piece having a tubular shape directly to part of the support member remaining after the removing, both ends of the spool piece being connected to connection pipes, for supplementing the measurement pipe having been cut and removed;
- deforming the spool piece having the tubular shape to match a shape of the breakage part;
- and
- connecting ends of the remaining measurement pipe to the connection pipes.
Dependencies are inferred from the claim text.