Laser cutting system for nuclear fuel disassembly Page: 17 of 24
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head feature allows the laser focusing head to be driven parallel
to the assembly for lengthwise slit cuts and then rotated for
circumferential and crop cuts. A gas jet is provided to remove the
molten kerf during cutting. A debris collection system consisting
of a gravity settling section for large particles and a gas-jet
aspirator/filter for all but subnicron-sized particles is attached
to the laser focusing head.
ALIGNMENT AND MAINTENANCE
To facilitate remote alignment of the laser system optics, all
mirror mounts inside the hot cell are motorized and equipped with
prealigned targets that can be rotated into position remotely
during the alignment procedure. To align the optics, the visible
HeNe laser and invisible carbon dioxide laser are first made
coincident by using Lucite burn patterns in the near and far field
regions outside of the hot cell. Once coincident, the HeNe laser
beam is progressively used on each mirror target down the beam path
until all optical components are aligned. A telescope or remote
television cameras are used to observe the mirror targets during
remote mirror alignment. The final alignment of the focusing
mirror and the gas-assist jet is verified by remote television
cameras and cutting tests.
All maintenance performed on equipment in the hot cell must be
performed with an overhead crane, power manipulator, or teleoperated
servomanipulator. For this reason, the entire in cell portion of
the laser cutting system has been designed into modular packages
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Weil, B.S. Laser cutting system for nuclear fuel disassembly, article, January 1, 1985; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1060470/m1/17/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.