| 摘要 |
A method for removing a plug from engagement with a nuclear reactor steam generator tube within a tube bundle, which plug has a shell, an expander, and a plug top, by providing a drill bit having a pilot portion and a drill portion, where the pilot portion diameter is smaller than the drill portion diameter. Further, removing a portion of the plug shell and expander using the drill bit and leaving the plug top in the tube. The plug top may be removed by providing a gripper tool, inserting the gripper tool into the tube, urging the gripper against the plug top and removing the plug top by removing the gripper from the tube.
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