ADAPTIVE DRILLING SYSTEM
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Jul 18, 2024
filing date -
Jul 18, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
An adaptive drilling device for extracting bolts from a control rod drive mechanism (CRDM) in a boiling water nuclear reactor includes a guide assembly configured to align and secure drilling activity, a drill assembly configured to drive a drill bit into a CRDM bolt, and a thrust assembly configured to linearly and bidirectionally drive the drill assembly. The guide assembly has three guide plates and a pair of guide rods. The drill assembly includes a gear reduction drive motor, drill bearings, a drill bit, and a securing subassembly configured to secure the drill assembly to a first guide plate. The thrust assembly includes a thrust handle connected to the drive motor, a central plate nut, a lead screw running through the central plate nut and connected to the thrust handle, and a feed wheel connected to the lead screw.
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