Mid-Year Client ReviewNovember 30, 2010
Joseph SeegmillerAlan Chatterton
Doug SmithWalter Taresh
Apparatus for the
Removal of
Cadmium
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AGENDA
• BACKGROUND• PROJECT GOAL• SPECIFICATIONS REVIEW• CLEANING PROCESS REVIEW• MOCK-UP• CADMIUM BUILD-UP SIMULATION• MATERIAL REMOVAL METHODS
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MARK IV ELECTROREFINER
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BUILD-UP ON ANODE SHAFT
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ELECTRO MECHANICAL MANIPULATOR
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PROJECT GOAL
• Design of a semi-automated system capable of removing cadmium buildup from the electrode assembly shaft of the Mark IV Electrorefiner to prevent electrical shorting between the electrode and vessel.
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SPECIFICATIONS REVIEW• Incorporation without interference with existing operations• Cleaning cycle time of 2 hours• Apparatus life of 100 cleaning cycles• Operate in high radiation environment• Capture majority of removed cadmium• Setup and operation with Master-Slave Manipulators (MSM)• 15 Pound force limit for MSM• No petroleum-based lubricants• Vertical load limit 200 pounds• Remote replacement defective parts/subassemblies• Shaft capable of rotation and up and down motion
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CLEANING PROCESS REVIEW
Electrode assembly removed from chamber
Assembly brought to handling station
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Lower part of assembly removed
Heat shield is removed, shaft is exposed
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Cadmium removed using files, scrapers, etc.
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EXPLODED DRAWING FOR MOCKUP
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MOCKUP STATUS• CURRENT STATE
Mill Attachment Point Original Component
Added LengthBearing Retaining Sleeve
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MOCKUP STATUS• STILL TO MACHINE
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Drill and tap
Machine part
Choose material and machine
SHAFT MOUNTED IN MILL
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CADMIUM BUILD-UP SIMULATION• SURRAGATE MATERIALS
• Brass – soft, comparable to cadmium
• Aluminum – harder than cadmium, but still relatively soft
• Silver Solder – soft, though difficult to solder to SS
• Wax – much softer, though easy to work with
• Spray foam – hardens to solid, easy to use
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SILVER SOLDER ON SS ROD
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• Benefits• Similar to Cadmium
• Difficulties• Will not lay down thick
MATERIAL REMOVAL METHODS
• FINE, COURSE AND MILLED TOOTH FILES
• Fine file - gummed easily, removed 0.006” from diameter in 2 minutes*
• Course file - did not gum as easily, removed 0.040” from diameter in 2 minutes
• Milled Tooth file - did not gum, removed 0.100” in 1-2 minutes
*Amount of material for one file blade width (app. 1.25”)
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FINE TOOTH FILE
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• Gummed easily, removed 0.006” from diameter in 2 minutes
COURSE DOUBLE-CUT FILE
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• Did not gum as easily, removed 0.040” from diameter in 2 minutes
MILLED TOOTH FILE
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• Did not gum, removed 0.100” from diameter in 1-2 minutes
SINGLE POINT TOOL BIT
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• More rugged than three point insert
THREE POINT INSERT TOOL BIT
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• Three separate cutting teeth for potential ease of tool replacement.
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WORK PLAN• By December 17th:
• Finish machining the mockup
• Provide mid-year report detailing current status
• Choose best material removal method
• Spring semester:
• January 12th: Begin system-level design with best cutting method
• February 21st: Interim report outlining system-level design
• April 4th: Completion of prototype
• April 29th: Demonstrate apparatus at Design Expo
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QUESTIONS?
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