review of actions from 2 last reviews · •double shunt on quadrupole bus •insulation system...
TRANSCRIPT
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Third LHC Splices Review
Review of actions from 2 last reviews
•Double shunt on quadrupole bus
•Insulation system
•Spiders and lyras electrical insulation
•DFBA consolidation
•Actions covered by TE-MPE
•Technical aspects
•Management aspects
•Other
NB : 33 actions from first review, 15 non-closed ones
18 actions from second review
13th of November 2012 Third LHC Splice Review
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13th of November 2012 Third LHC Splice Review
Review I: II.3 1) p7/14 : Double shunt on the quadrupole bus The Committee recommends that a double shunt be applied to the quad bus.
Third LHC Splices Review
Double shunt on quadrupole bus
See presentations by F Savary, C Scheuerlein, Knud Dahlerup Petersen,
and other ones
Review II: 1 II.1 p4/11/14 : Criteria for single shunt on quad bus The following criteria must be met, if a single shunt is to be used on the quadrupole bus:
- The rebuild criteria presented in Christian Scheuerlein’s talk must be applied rigorously.
- The insulating cover must be effective in limiting the deflection and stress on the splice,
to prevent the future degradation of the copper stabilizer connection.
- The energy extraction time constant must be reduced to ≤ 20 sec.
- The shunt must be soldered properly and QC of the shunt must be done correctly. The
soldering procedures and QC plans should be presented at the next review.
2nd Review: The Task Force has not found a satisfactory way to implement this
recommendation. We believe that the single shunt can be acceptable if certain
other conditions discussed above are met. This cannot be closed until the
insulating cover design is complete and shown to provide adequate mechanical
constraint, and the other criteria cited in recommendation (n) above.
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13th of November 2012 Third LHC Splice Review
Review I: II.3 4) p7/14 : Mechanical calculations Make mechanical calculations for the shunt design and the insulating part (3D stress analysis including fatigue
and thermal stresses) and document them to support the final design. All the new model calculations need to
incorporate shunts in the most severe conditions assumptions (for example no mechanical connections internal to
the original splice due to the lack of soldering).
Third LHC Splices Review
Consolidated insulation system
2nd Review: Much of this has been accomplished, but the current model for the
insulation box is not fully adequate
Review I: II.3 6) p8/14 : Clamping system Continue the development of the design for a clamp that would hold together the shunt and splice in the absence
of solder, to help limit the damage during the time of an energy extraction, and implement the chosen design.
2nd Review:Good progress, but design is not yet final
Review II: 2 II.1 p4/11 : Insulation cover modelling Review the design and the modelling of the insulation cover to show that it is effective in reducing the mechanical
stresses on the splice and shunt, for both dipole and quadrupole connections
See presentations by F Savary
Review I: II.4 1) p9/14 : Industrialize manufacturing procedures The Splice Task Force needs to work on improving the manufacturing procedures and the tooling in such a way
these are reproducible and not depending on the individuals doing the work. This includes developing adequate
QC plans. The review committee recognized the fact that, at this stage of the consolidation programme, this is
more important than working out a detailed schedule.
2nd Review:Excellent progress overall, but cannot be completed until the design is
complete, particularly of the insulation box
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13th of November 2012 Third LHC Splice Review
Review II: 12 II.3.3 p6/11 : Spiders insulation Continue to explore ways
to insulate the spider from ground potential
and to increase the creep path of the buss to metal support of the spider.
Third LHC Splices Review
Actions from second review
Review II: 13 II.3.3 p6/11 : Lyras insulation Continue to explore external methods to insulate the lyras from ground potential. Even if a solution
cannot be found for all case where these two electrical insulation problems are in issue it would still
be best to repair what is readily accessible.
Triggered by: Screening for Defects in the LHC Magnets Electrical Circuits (Mar2010-Jun2011), Final Report,
Conclusions and Recommendations [EDMS 1176186]
Presented at the Review by H Ten Kate
Working method 1. The screening person prepares a presentation with supporting documents and raises a list
of risk issues he or she thinks are relevant.
2. The experts group defines (a list of) practical recommendations for the system under
study…
3. A group (TE-MSC-LMF) documents a detailed analysis, design and engineering solution.
4. CERN management decides to execute or not the engineered solution following the
recommendation
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
The consolidated electrical insulation (H Prin) https://indico.cern.ch/getFile.py/access?contribId=40&sessionId=4&resId=1&materialId=slides&confId=157231
Presentation of a first concept, only partial and not finalised
Implementation
Heating during welding (~300°C)
Friction during cooling
Fixation to the flange
Behavior during quench
Reliability in time
Remnant in the cryogenics filters
A lot of work was
accomplished
(solution, tests,…)
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
Available partial solution H Prin :SMACC Meeting 11.07.2012 [EDMS 1232922] / LHC splices TF 12.09.2012 [EDMS 1241232]
Rolled sheet of fiber glass impregnated with EPOXY (0.25mm)
Fixation to the insulation box (Stainless Steel)
Flange aperture not covered to avoid degradation during welding
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
Available partial
Solution implemented on the
Q8-Q9 test in Sm18 on both
M1 & M3 lines
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
Experience: Spiders: Only one NC [EDMS 831608]
Bellows was cut, insulation reinforced and spider was
corrected
A corrective procedure is available and mastered
Was detected during standard ELQA test during
assembly, prior to operation
Likely generated by assembly work (surface or
interconnection in the tunnel)
This kind of defect (if any) will be detected during
the ELQA test during splices consolidation
Present ELQA diagnostics guarantee that there is
no such defect in the LHC
QPS diagnostics will likely be improved
(amplitude to be defined)
The PAQ HV test of the half-cell 23R6 not passed. Short between the main BB M3 ext.
and the ground.Resistance main BB M3 ext. versus ground is 0.3 Ohm (measured at
QBQI.22R6) and 5.3 Ohm (measured at QBQI.23R6)
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
Experience: Lyras: [LMC 22.09.2009]
Was detected by ELQA monitoring during cool-down, prior to operation
Generated by motion during thermal contraction
This kind of defect (if any) will be detected by the ELQA diagnostics
Present ELQA diagnostics guarantee that there is no such defect in the LHC
QPS diagnostics will likely be improved (amplitude to be defined)
After 3 day of cool-down, a short circuit to ground was detected on the MBA.A67 line of
the main dipole circuit. After diagnostic, the defect is localized at the level of dipole 3287
at the position A12R6. The warm-up is launched for repair.
Sleeves and bellows were cut and insulation reinforced
Corrective procedure available and mastered
No preventive action recommended (LMC)
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
Actions from second review
Experience: Lyras: Repair procedure
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Third LHC Splices Review
Actions from second review
INVENTORY OF THE SINGULAR POINTS AND FIRST RISK ASSESSMENT FOR THE LHC 13 KA
CIRCUITS [EDMS 1144154: 267 pages]
Risk index = (Technical) ( Criticality + Sensibility ) Frequency
Technical : mechanical aspects, cu-cu joint, SC splice,
insulation concern [4 to 12]
Criticality : quality of the construction process : Sum of
construction difficulty and access difficulty [0 to 5]
Sensibility : consequences of a failure : Sum of failure
detectability and failure consequences [0 to 5]
Frequency : Recurrence of each singular point / Total
number of Singular Points [X / ≈ 22 500]
Singular points are : every splices in the cold mass, lyras,
fixed points, diodes connections, ….
For the spiders : RI =
6 * (1 + 3) * 0.064 = 1.54 (dipole circuit)
6 * (1 + 3) * 0.032 = 0.768 (quadrupole circuits)
For the lyras/sextupole corrector supports : RI =
7 * (3 + 4) * 0.064 = 3.144
13th of November 2012 Third LHC Splice Review
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Third LHC Splices Review
Actions from second review
13th of November 2012 Third LHC Splice Review
Aren’t we contaminated by the lamppost syndrome ?
Ex 1. Splices inside the cold masses have a higher risk index
Corrective actions for the more critical cases
8 dipoles and 1 SSS replaced
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Third LHC Splices Review
Actions from second review
13th of November 2012 Third LHC Splice Review
Ex 2. BUS BAR – HEAT EXCHANGER CONTACT
No systematic preventive action
Reinforced on cold masses installed during LS1
A corrective procedure is available and mastered
Other cases for which no systematic
action is planned because not
pragmatically feasible.
The best solution would be to redesign the spiders and other weak components
• Not pragmatically feasible
schedule [many months], budget [several MCHF]: in the best cases
• Not riskless operations
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Third LHC Splices Review
Actions from second review
13th of November 2012 Third LHC Splice Review
Our approach is to carry out corrective
interventions complemented by
systematic inspection of new magnets
and random partial inspections in the
LHC tunnel because:
Corrective procedures are available and mastered
No failure occurred during operation
Diagnostics efficiency for this kind of issue is proven
LHC machine can tolerate one fault to ground per sector
Systematic preventive interventions are not pragmatically feasible and are
not riskless
In the unlikely case of failure, the extent of the damages will be limited thanks
to finalisation of consolidation measures (Safety relief devices, SSS
anchoring to ground)
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13th of November 2012 Third LHC Splice Review
Third LHC Splices Review
DFBA consolidation
See presentation by A Perin
Review II: 10 II.3.3 p6/11 : Initiate design for DFBA splices consolidation Initiate the design for the DFBA splice repair immediately
Review II: 11 II.3.3 p6/11 : Study methods to lower risks for specific DFBAs Investigate methods and/or procedures that would lower the risk of repair of the two DFBAs that
require re-location to perform the work.
Review II: 9 II.3.3 p6/11 : Consolidate DFBA splices Apply shunts to the 13 kA splices in all DFBAs, including the most difficult circuits Repair these
joint up to the same standards and based on the same designs as in the magnet to magnet
interconnect. Splice repairs should be done by the same crew that repairs the magnet to magnet
interconnects.
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13th of November 2012 Third LHC Splice Review
Review I: II.7 3) p14/14 : Actual operating voltages Determine the actual operating voltages to judge required hipot levels
Third LHC Splices Review
Actions covered by TE-MPE
2nd Review: In progress, but new hipot voltages have not been formally established.
Review I: II.7 4) p14/14 : Proper dump voltages Check documented dump circuit requirements or redo quench calculations to assure dump voltage
levels are proper
2nd Review: In progress
Review I: II.7 5) p14/14 : Simultaneous hipots of different buses Consider simultaneous hipots of different buses to test bus-to bus withstand capability without
going to needlessly high hipot stresses
2nd Review: This technique seems not to have been considered as part of the re-
evaluation of hipot voltages. It should still be considered.
See presentations by K Dahlerup Petersen & R Schmidt
Review I: II.2 4) p5/14 : Ground current/voltage monitors. Make necessary changes so that ground current monitors are installed on all lower current circuits.
These ground current signals should be included in the control system to be logged and to be
alarmed when above a pre-set level. The alarm level should be ubstantially below the power supply
hardware interlock for high ground current
2nd Review: Closed, Implementing it
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13th of November 2012 Third LHC Splice Review
Review I: II.2 3) p5/14 : Hot spot calculations. Include in the integrated system surveys the temperature limits of the various components of each
circuit. Perform the calculations to determine the maximum temperatures for the components in the
different circuits. Check to see that there is an appropriate margin for the maximum temperature of
the circuit components and that the overall risk are balanced between voltage and temperature.
Third LHC Splices Review
TE-MPE
2nd Review: Work in progress. This analysis should be completed, at least for the more
critical elements, before LS1 to be able to profit from anything that is learned from the
analysis.
Review II: 8 II.3.2 p6/11 : IT and MS splices measurement Provide sufficient resources to make splice measurements on the inner triplet and matching section
circuits well before the beginning of the long shutdown.
Review II: 15 II.3.3 p7/11 : Documentation and modeling Supply the necessary resources to finish the documentation and modeling tasks. The Task Force
needs this information and tools to analyze the various electrical systems to better understand
potential failure mechanisms and to improve testing of various system
See presentations by R Schmidt
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13th of November 2012 Third LHC Splice Review
Review I: II.3 Com2 p6/14 : Document shunt testing The Committee finds results from high current shunt testing between FRESCA and SM18
confusing. Modelling of all test cases should be documented and qualified based on experimental
data, and then applied to the shunt design with worst case assumptions.
Third LHC Splices Review
Technical aspects
• Report was released on 20.01.2012
“Electro-thermal and mechanical validation experiment of the consolidation of the LHC
13 kA arc splices”
• See presentation by F Lackner & F Savary
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13th of November 2012 Third LHC Splice Review
Review I: II.3 3) p7/14 : Multiple samples to get experience Make multiple samples/trials of critical steps, as part of a qualification plan to be developed, to get a
statistically significant basis for assessing the risks of there being any important imperfections in the
machine after installation
Third LHC Splices Review
Technical aspects
2nd Review : Have done multiple tests on many variants of the splice repair
components. Once the design is completed, a statistically significant number of samples
of the final design still need to be tested
Review I: II.5 3) p11/14 : Lead containing solder The Splices Task Force should consider the potential hazards for workers associated to the
utilization of lead-containing solder, and work with the Safety Commission to plan the work to
minimize or eliminate this risk
2nd Review: Barely begun. This is important, since in the original design of the LHC the
use of lead-containing solder was rejected on safety grounds.
Review I: II.5 4) p11/14 : Tooling calibration plan A verification and calibration plan for the special tooling should be drawn up and implemented to
assure a constant quality of the work throughout the production
2nd Review: Nothing presented at this review.
T Otto’s presentation
Started
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Review I: II.6 2) p12/14 : Optimize tooling and validated on mock-ups The Splices Task Force should draw out a work plan for redesigning and optimizing the various
tooling needed for the consolidation activities. These tooling should be validated on the surface
simulating as real working conditions as possible (e.g. space constraints)
Third LHC Splices Review
Technical aspects
2nd Review: Good progress. Potential still exists for improvement in some testing
fixtures and tooling related to installation of the insulating cover has not been finalized.
Review II: 4 II.1 p4/11 : Procedures for training Write detailed manufacturing procedures and QA procedures within the next few months in order to
be used for the training of the crews.
Review II: 5 II.1 p4/11 : Procure tools Start procurement of the M-line cutting machines, busbar machining tooling, shunt soldering tooling
and main splice tooling now in order to stay on schedule.
Review II: 6 II.2.2 p4/11 : Consolidated QC plan, clarify criteria Consolidate the QC plan, in particular on how to implement the plans and procedures and some of
the qualification criteria which have not yet been clarified.
Launched
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13th of November 2012 Third LHC Splice Review
Review I: II.4 2) p9/14 : Workplan, schedule, WBS It is necessary to have a preliminary work plan with its associated schedule and WBS
Third LHC Splices Review
Management aspects
2nd Review:In progress. No WBS exists yet.
Review I: II.4 3) p9/14 : Professional scheduler It would be advantageous for the Splice Task Force to work with an experienced/ professional
planner/scheduler. The planning needs to be integrated with the planning for other work that will be
done in the tunnel during the same shutdown.
2nd Review:This has begun, but most of the work still remains to be done
Review I: II.4 4) p9/14 : Contingency and extra resources The planning needs to take account of the possibility of unforeseen developments that will slow
down or disrupt the orderly work flow. For example, a larger number of splices than the currently
estimated 15% may be required to be remade, or problems with the machining of the copper
stabilizer could arise. Include schedule contingency into the baseline and ensure that additional
resources are available to able to maintain the schedule.
2nd Review: Little progress since last year
See presentations on SMACC Organisation and by K Foraz, M Pojer
The Organization, Scheduling and Safety section of EN-MEF was reinforced by M.
Bernardini (Work in close collaboration). See also K Foraz’s presentation
R Principe (MSC-LMF) is in charge of the detailed scheduling of the splices consolidation
See presentations on SMACC Organisation
Enough?
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Review I: II.6 1) p12/14 : Alternative scenario with unforeseen issues Study alternate scenarios in view of optimizing the utilization of the critical resources that will
certainly be limited (in terms of qualification and experience). Study unforeseen/unexpected
scenarios
Third LHC Splices Review
Management aspects
2nd Review: No evidence that this has started
Review II: 3 II.1 p4/11 : Ratio exp/non-exp staff Do not reduce the ratio of experienced staff to contract or other temporary labor below the currently
planned level, in order to maintain the required quality of the repairs
Review II: 16 II.4 p7/11 : Update plans, for work QC resources and schedules Update the plans for the work organization, the quality control, the resources and the schedules.
Make further updates once the designs are final.
Review II: 17 II.4 p7/11 : Resources loaded schedule for the preparation phase Prepare a detailed resource-loaded schedule of the work that remains to prepare for the shutdown.
This needs be developed within the next month to be an effective planning tool.
Not formally but through SMACC project and TF structures
See presentations on SMACC Organisation
Enough?
See presentations on SMACC Organisation
Enough?
See presentations on SMACC Organisation
Enough?
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13th of November 2012 Third LHC Splice Review
Review I: II.6 2) p12/14 : Risk analysis CERN should insure that enough resources are allocated to ensure that the risk assessment and
subsequent risk analysis can be executed on the planned time scale
Third LHC Splices Review
Other
2nd Review: Excellent work was done on the screening exercise, but it is important that
the recommendations that result be implemented. It should be the goal to complete the
critical ones before LS1
Review II: 7 II.2.3 p5/11 : CSCM to be considered for periodic requalification Consider the utility and practicality of utilizing the CSCM for periodic “requalification” tests of the
main quadrupole bus circuit.
Review II: 14 II.3.3 p6/11 : Diode joint resistance Continue working on determining the root cause of the measured increase in diode mechanical joint
resistance
See next presentation by F Savary
To be revisited by the splices TF
See dedicated session (H Thiesen)
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13th of November 2012 Third LHC Splice Review
Review II: II.4 p7/11 : Address the recommendations that remain open from the
previous review before the next review.
Third LHC Splices Review
Conclusion
This presentation in particular and more generally this review
?