engineering operations
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
OH water leak repair preparation:• The upper TF hub disassembled to provide access.
•Repair Area
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.
0.638”
0.394”
•OH Conductor
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
Engineering Operations
OH Lead mechanical support:• A G-10 block added to support vertical and twisting loads.
Engineering Operations
Insulation repair:
•Epoxy/glass ground wrap around both conductors
•Turn insulation on lower conductor untouched
•Kapton insulation added to repaired conductor
•G-10 spacer between conductors
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.
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.
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 scope of the upcoming outage. A timely start to the FY11 run is needed to support an aggressive NSTX upgrade schedule.