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Hot Rod Design Review for Fuel Element Separation in Hot Cell Environment

Review of various designs for a device to separate nuclear fuel elements from a hexagonal grid plate assembly in a hot cell environment. Tasks analyzed include securing, positioning, pin and fin removal, and element separation.

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Hot Rod Design Review for Fuel Element Separation in Hot Cell Environment

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  1. Team Hot RodDesign Review Andy Griff, Bill Crane & Jerrod Warner November 15, 2007 JEB 111, Moscow, ID

  2. Background • Idaho National Laboratory (INL) • Hanford fuel assemblies • Hot Cell environment • Fuel disassembly • Cut hex duct • Remove fuel elements • Containerize

  3. Problem Statement Design, build, and test a device for use in a “hot cell” environment that is capable of separating 169 fuel elements from a hexagonal grid plate assembly.

  4. Mock-Up

  5. Task Analysis • Five Tasks • Securing of fuel assembly • Positioning/alignment • Pin removal • Fin removal • Element removal

  6. Pin Removal (Design 1) • Lever Arm • Pros • Mechanical advantage • Simple operation (MSM) • Cons • Pin and linkage alignment • Size

  7. Pin Removal (Design 2) • Screw Punch (Manual/Pneumatic) • Pros • Ease of use (MSM) • Minimizes impact • Size • Cons • Alignment • Visibility

  8. Fin Removal (Design 1) • Gripper Rail System • Pros • Use of rod contour • Range of motion • Cons • Element spacing • Adjacent row alignment • Alternate gripping

  9. Fin Removal (Design 2) • Grip Fin Rail System • Pros • Balanced force • Existing surface area • Not cantilevered • Cons • Rod/Fin integrity • Precise movements (MSM)

  10. Fin Removal (Design 3) • Gripping Element Ends • Pros • Gripping area • Easy access • Cons • Row clearance • Slipping • Fin binding

  11. Element Removal (Design 1) • Waffle Maker • Pros • Elements secured rigidly • Use of existing fin holes • Cons • Element spacing • Positioning elements (weight)

  12. Element Removal (Design 2) • Fin/Element Combination • Pros • Combines processes • Elements held by contour • Cons • Element spacing • Binding

  13. Element Removal (Design 3) • Push Pin • Pros • Only hold one element • Minimal binding moment • Element spacing irrelevant • Cons • Removing push pin • Pin alignment Push Pin Element Holder

  14. Element Removal (Design 4) • Individual Element Removal • Pros • Eliminates steps • Easy motions • Compact size • Cons • Clearance issues • Rod end support

  15. Axiomatic Design

  16. Schedule/Work Plan • Senior Snapshot (Nov. 30th) • Final Design Chosen (Dec. 5th) • Semester Report (Dec. 7th) • Detailed Design (Jan. 9th-Feb. 15th) • Build Prototype (Feb. 15th-Mar. 28th) • Prototype Testing (Mar. 28th-Apr. 11th) • INL Presentation (Apr. ???) • Engineering Expo (Apr. 25th)

  17. Questions/Ideas (Tom & Jim) • Verify cut location • Pneumatic devices onsite (grippers, motors, etc…) • Table information (dimensions, etc…) • Clearance under sideback • Sideback dimensions • Positioning method/equipment (specific way?) • Fin material strength • Parts from dummy assembly • Positions/Securing ideas?

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