Summary of NCSX System Integration Team (SIT)
Meeting of Monday, April 12, 2004
1. Critical FDR
issues needing attention (Brad)
- Modular coil deflections:
Brad reported on the status of ongoing analysis
activities:
- Dennis Strickler is now
well positioned to take the deflection output from Myatt�s analysis and
evaluate the resulting islands. Dennis should be in contact with Art Brooks
to ensure that the project�s various approaches to this problem don�t
diverge.
- Len Myatt has calculated
localized deflections of about 1 mm for the strong winding-pack case in the
approximation that the pack is rigidly tied to the shell. Stresses were low.
The soft winding-pack case is in progress.
- Kevin Freudenberg�s model
allows the winding to slide with respect to the structure, modeled as a
stiff shell and deformable tee, and models the clamps. His Mechanica
results are consistent with ANSYS where they can be compared: stresses and
global strains. Deformations are of order 1mm.
- H.M. Fan�s global
modeling is slow. It may not produce results in time for the FDR, even with
more resources. Action: Wayne and Brad review analysis resource
assignments.
Current
assessment: Deflections are about 1mm and likely to be acceptable as they are
stellarator symmetric. There is the fallback possibility of pre-displacing the
coil if necessary. The pursuit of parallel approaches enhances the likelihood
of getting useful results even if some approaches fall short, and enhances
confidence in the results by providing
cross-checks.
- Material properties testing
and design criteria: The main issue now is cyclic testing to determine
the fatigue life of the coil. The test parameters and test program must be
carefully chosen due to the limited number of test samples and limited amount
of time remaining before the FDR. A meeting on Monday afternoon, April
12, made progress but did not result in a clear path forward. A follow-up
meeting is planned for Thursday, April 15.
Current
assessment: No information on fatigue life at this time. Though
cyclic testing will likely start soon there is a significant risk that we will
not get useful data in time for the FDR, or that we will get negative or
confusing results and not have enough time to follow up. The SIT needs
to stay on top of this issue.
- Machine geometry issues:
The assembly interference issue appears to be resolved. It will remain
on the critical issues list for awhile to make sure it stays resolved.
Action: Brad keep an eye on it.
- FDR deliverables:
Brad reported that a complete set of VV and MCWF models and drawings has
existed since the PDR. While they need to be updated for the FDR, they do not
need to be created from scratch. B-specs and C-specs are getting
written and peer reviewed in the current time frame.
2. Critical-path issues needing
attention (Wayne)
- Winding fabrication issues:
Chill plates and bolted joints may need some additional engineering to
come up with practical implementation concepts. Bob Parsells was recommended
but his availability is unclear. Action: Dudek follow up with Brad.
- Planar racetrack coil
tests: The planar racetrack will be the first article tested in the new coil
test facility. There is still much to be done to get the facility ready
for testing. Geoff Gettelfinger is on top of it. Test results are not expected
in time for the FDR.
- Weld joint R&D:
We will plan to complete the small-sample tests this fiscal year. We
will plan conservatively to complete the full-scate test next year, but try to
get it done this year if possible.
- VVSA Procurement: The
product spec was peer reviewed last week and the SOW will be peer reviewed
this week. We will miss the April 13 schedule for release of an advance Spec
and SOW to the suppliers by at least a week.
- MCWF Procurement: A
joint peer review of the product spec and SOW is scheduled for this Wednesday.
Next milestone is to release an advance Spec and SOW to the suppliers on
May 5. Action: Hutch follow up on SPEB-Project interface
issues.
3. Cost and schedule
- Ron reviewed changes in the
current estimates and management reserve spending decisions for FY-04.
- A transfer of an additional
$317k from PPPL to ORNL has been approved by PPPL and will be requested of
DOE.
- It was decided that ECP-6
will collect cost and schedule baseline changes only. A CCB is planned for
next week. The goal is to get ECP-6 approved by the end of April.
- ECP-7 will define the FDR
baseline and will include the technical, cost, and schedule changes associated
with the reconfiguration of the ports. ECP-7 will be prepared in draft
form for the FDR. After being revised to reflect any changes coming out of the
FDR, it will be approved before the Lehman review.
- Delays in the winding
fabrication preparations are pushing this activity onto the critical path and
threatening the overall schedule. A corrective action plan will be
needed for upcoming reviews.
4. NCSX Quarterly Briefing for OFES, April
15
- Hutch will update project
status, plans, and issues at the quarterly meeting. Actions needed to support
preparations:
- Vu-graph on research
preparation- Mike.
- Forecast of ECP-6 and
�7 contingency drawdown- Bob.
- Feedback on slides
when issued later this week- All.
5. Next SIT Meeting:
Monday, April 19 at 11:00 a.m. EDT.
Summary by:
Hutch Neilson