Patent ID: 11862355
Assignee: KOREA ATOMIC ENERGY RESEARCH INSTITUTE
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC G  Y | IPC G

Claim 4:
5. The method of claim 1, wherein
the performing the first drilling operation further includes,
installing the first drilling device in the drilling portion so that the first core bit of the first drilling device is installed in a parallel relationship with the radioactive structure based on an angle at which the radioactive structure is buried in the wall, and
driving the first drilling device so that the drilling portion is drilled to a first depth, and

the performing the second drilling operation further includes,
installing the second drilling device in the drilling portion so that the second core bit of the second drilling device is installed in a parallel relationship with the radioactive structure based on the angle at which the radioactive structure is buried in the wall, and
driving the second drilling device so that the drilling portion is drilled to a second depth.