F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF, TF, & Trim Coil Supports (WBS-15) Core Base Support Structure (WBS-17) F. Dahlgren NCSX Coil.

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Presentation transcript:

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF, TF, & Trim Coil Supports (WBS-15) Core Base Support Structure (WBS-17) F. Dahlgren NCSX Coil & Core base support structures

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Requirements: PF, TF, Trim Coil Supports The coil support structure provides the means for accurately locating and supporting the TF, PF, & Trim coils. It must provide adequate support for the EM loads arising from the coil operational scenarios and fault conditions. It must have sufficient compliance to accommodate cooldown from room temperature to 77 deg.K It must be sufficiently rigid to limit coil deflections to acceptable values per field error criteria. It must have a relative magnetic permeability less than 1.02 It must limit eddy currents to effectively limit field errors at the plasma boundary. It must meet the NCSX seismic & Structural Design Criteria.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Requirements: Base Support Structure Functional requirements: Provides the gravity load path from the NCSX core to the test cell floor. It must not exceed the maximum test cell floor loading of 4,500 lbs/sq.ft. It must have a relative magnetic permeability less than 1.05 It must meet the NCSX Structural Design & Seismic Criteria. It must provide support & clearance for the three period assembly tooling.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Interfaces PF,TF, & Trim Coil Supports The coil supports interface with the MCWF shell which provides the load path to react all coil EM and gravity loads. It will also interface with the mounting hardware for supporting the coil buswork, cryogen lines & cryostat. PF5 PF6 TF Coils MCWF Base Supports Assembly cart

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Interfaces PF5 & 6 support brackets are cantileverd off the TF outer brackets PF5 PF6

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Interfaces The interface between the MCWF and Base Support columns Spherical Bearings provide translational connections and avoid introduction of rotational moments on the MCWF shell. Low friction PTFE sheets provide a low compliance radial interface to allow for differential thermal contraction from room temperature base supports to 77 K core. TF Coil bracket & clamp interface PF4 Coil bracket & clamp interface Lateral TF coil clamp

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Interfaces Base Support Structure The base support structure interfaces with the test cell floor, and TF support brackets. It also provides the mounting pads for the three period assembly fixtures. Mounting pads for 3-period assembly cart rails Test cell floor psf) Spherical bearing Housings

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Design Status PF,TF, & Trim Coil Supports Peer review held on 01/18/07 PDR held on 07/20/07 FDR scheduled for 06/16/08 Pro-E design integration complete. Preliminary drawings issued for review. Minor revisions being implemented to accommodate trim coil support mounting hardware. Design in final detailing awaiting interface information for buswork, cryogen lines, and cryostat mounting hardware. FEA modeling utilizing a single period fully integrated model is complete. FEA analysis of various EM and fault loading conditions is underway (~ 30% complete) with the fully integrated FEA model.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Design Status Base Support Structure Peer review held on 01/18/07 PDR held on 03/06/08 FDR scheduled for 04/30/08 Pro-E design integration complete. Preliminary drawings issued for review. Minor revision to accommodate cryostat interface underway. FEA modeling (w/testcell floor & structure) complete. FEA analysis complete.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Procurement Plans PF,TF, & Trim Coil Supports Current plan for a fixed price subcontract. At least two potential vendors have been identified and budgetary estimates have been received. RFQ & CSPEC are being prepared, with a projected procurement cycle of 6 weeks starting mid-July ‘08 (subsequent to FDR). Base Support Structure Procure main columns & beams from Stainless Structurals, LLC (~ 13 weeks) Fabricate parts in-house (welding, drilling, & assembly).

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Cost & Schedule - Coil Supports PF,TF, & Trim Coil Supports - Design PF,TF, & Trim Coil Supports - Fabrication/Procurement Total: 1,439k$ (FY’09)

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Cost & Schedule - Base Support Structure Base Support Structure - Design Base Support Structure - Fabrication Total: k$ (FY’09)

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Risks & Mitigation PF,TF, & Trim Coil Supports & Base Support Structure Both these jobs are comprised of conventional weldments and bolted assemblies. As such they are classified as relatively low risk components with minimal probability of cost escalation or scheduler delay associated with their procurement and fabrication. Risk: The main source of cost escalation would be tied to increased commodity prices for Nickel and Molybdenum and the weakening value of US dollar vs. the Euro. Mitigation: Expedite procurement of stainless structurals and Inconel hardware. US Dollar vs. Euro Nickel Price Since January

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Backup slides

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Strip heaters (4 per column) will be used to maintain R.T. (40 to 60 F) of columns

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Bottom surface slides on Teflon sheet

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Inner TF coil mtg. brkts. Outer TF Coil mtg. brkts. PF4 Coil Mtg. off inner TF brkts.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF Coils are shimmed & clamped to the support brackets PF5&6 are shimmed & clamped. Brackets are cantilevered off the outer TF bracket assembly. All bolted Joints on bracket bracing are now welded.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 Trim Coils are shimmed & clamped to the support brackets Trim coils mount to PF5 &6 cantilevered bracket assemblies. Vertical channels provide additional support between the top and bottom brackets. Inbd.Trim coils mount to TF-bracket assemblies.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF-TF Coil Supports -Cost estimate breakdown

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF-TF Coil Supports -Cost estimate breakdown -con’t. Supplemental parts Inner & Outer TF Lateral Pre-load: $125,876

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF-TF Coil Supports -Cost estimate breakdown -con’t.

F. Dahlgren -SC Project Review of NCSX, April 8-10, 2008 PF-TF Coil Supports -Cost estimate breakdown -con’t. Cost estimates are based primarily on budgetary quotes from prospective vendors: