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Engineering Operations

Engineering Operations. OH water leak: Water leak is located ~ 4.5” into the upper OH lead. Leak location @ 2 o’clock. Cooling hole 0.188 in. dia. Engineering Operations. OH water leak:. Leak first seen between conductor & Insulation. Engineering Operations.

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Engineering Operations

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  1. Engineering Operations • OH water leak: • Water leak is located ~ 4.5” into the upper OH lead. Leak location @ 2 o’clock Cooling hole 0.188 in. dia.

  2. Engineering Operations OH water leak: Leak first seen between conductor & Insulation

  3. Engineering Operations • OH water leak repair preparation: • The upper TF hub disassembled to provide access. • Repair Area

  4. 0.394” 0.638” Engineering Operations • OH water leak repair options: • The mechanical and leak repairs will be addressed separately. • A pin-hole leak can be repaired with a leak sealer. For a crack, the cooling hole will be reamed to a larger diameter to accommodate a cooling sleeve. An O-ring at the end of the sleeve will be compressed at the end of the reamed hole. • OH Conductor

  5. Engineering Operations • OH stress crack repair (IF REQUIRED): • A copper bridge secured to the conductor and lead block using either clamping or a TIG-braze. • Stitch TIG- Braze 1/8 “ fillets around support block to lead block • TIG- Braze 1/8 “ fillets around support block to conductor • Copper support block fits snuggly around conductor and attaches to lead block • OH Center

  6. Engineering Operations • OH Lead mechanical support: • A G-10 block added to support vertical and twisting loads.

  7. Kapton insulation added to repaired conductor • Epoxy/glass ground wrap around both conductors • Turn insulation on lower conductor untouched • G-10 spacer between conductors Engineering Operations • Insulation repair:

  8. Engineering Operations • Post repair monitoring: • Sight tubes added to allow periodic (daily?) inspections w/boroscope. • Leads can be brought out to electrically monitor the resistance of the conductor or the flex link • A leak divertor with an electronic water monitor is possible.

  9. Engineering Operations • LLD Heating: • A “house air” heater to heat the 4th LLD plate has been assembled in the VPL and tested to 12CFM at 300C.

  10. Engineering Operations • Updated FY10 Schedule: • NSTX has completed 2 weeks of the planned 15 week run. • We expect to resume operations on May 24th, but could be ready a week earlier based on the scope of the repair. • Assuming a maintenance week each month, NSTX will need to run into September this year. • Need to determine the scopeof the upcoming outage. A timely start to the FY11 run is needed to support an aggressive NSTX upgrade schedule.

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