October 13 th 2015 Year End Technical Stop YETS Meeting A Perin K Brodzinski TECRG with contributions from M Pezzetti N Vauthier C Fabre G Ferlin U Wagner S Claudet LHC ID: 781469
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Slide1
Slide2CRG activities for YETS 2015 update
October 13th 2015Year End Technical Stop (YETS) Meeting
A. Perin,
K.
Brodzinski, TE-CRG
with contributions from M. Pezzetti, N. Vauthier, C. Fabre, G. Ferlin, U. Wagner, S. Claudet
Slide3LHC cryo
YETS main strategy
Maintenance is needed on all cryoplants. Heavier maintenance and consolidation are needed in IP4 (A) & IP6 (A), heavy corrective maintenance (repairs) is needed in IP8 (B).
Cryostart / cryomaintain until 14 Dec (start of YETS).
Last cryostart back on 4 March (earlier in IP8 & IP4)
The organization of the schedule takes into account the maintenance of the cooling water systems, AUG tests, etc.
Instrumentation and control activities for the tunnel are all planned to be performed during
cold standby.
A dedicated coordination shall be organized to avoid interference with other activities like ELQA (meeting planned 19
th
Nov)
Slide4LHC YETS strategy and requirements
Baseline:
keep the helium in the arc magnets filled with LHe in cold standby at
3
.5 K – 4 K (~12 hours autonomy without loss of He).
LSS in GHe at 20 K, DFBs empty with current leads in cold standby.
Other
possible requirements like: emptying sectors, early ELQA
in sector
7-8: being
studied
.
Overall strategy
:
One of the two plants of the points/sectors operational
for cold standby of the sectors.
Perform maintenance taking into account cooling water
maintenance, etc..
Swap plants after maintenance.
Requirements for cold standby at 3.5 K – 4 K:
One cryoplant (LHCA or LHCB). Utilities are needed for one cryoplant! (cooling water!)
Cold compressors not needed (shutdown). One warm compression station needed.
One cryoplant is kept ready for quick startup (cold < 80 K or light maintenance) as backup in case of necessity.
During CERN 2 weeks closure: 1 cryoplant operational, 1 in standby below 80 K for quick backup in case of problems.
Exception
: IP8, repair of leak in cold box of cryoplant B (not light maintenance), no backup cryoplant during approx. 2 weeks in January.
Slide5LHC cryo YETS main sequence & heavy corrective maintenance.
sequence
Preparation for YETS: 1 week, from 14 Dec.
Maintenance window: 2 to 4 weeks depending on cryoplant (see below). All maintenance that could required stopping the cryoplant will be performed within this window.
Pumping (cooling to 1.9 K) + refilling of sectors: 3 days for 1 sector, 4 days for 2 sectors
If needed reconfiguring to bring two sectors on line 1 day.
Cryo-tuning before cryostart: 6 days.
Typical approx. 7 weeks duration for each cryoplant.
Planned heavy corrective maintenance & consolidationP8 QSRB (cold box): repair of leak requires warmup, 2 to 4 weeksP4 & P6 QSCA (compressor): replacement of adsorber charcoal + install an additional coalescer, 4 weeks
Slide6LHC cryo YETS specific points & questions
P18 & P2:
Underground water loop maintenance/ replacement. Confirmed no need of upgrade for HL-LHC.
Intervention date to coordinate
.
Maintenance sequence: P18 (B, 3 weeks) – P2 (A, 3 weeks).
Two sites: warm pumping system must be operational at the same time as the 4.5 K cryoplant.
Cryostart returns on 4
th MarchP4:Heavier corrective maintenance on QSCA (compressor station): replacement of the adsorber charcoal + consolidation with installation of an additional coalescer. Requires 4 weeks. Sequence: B (2 weeks) – A (4 weeks)Cryostart returns on
13
th
Feb (arcs only), 22
nd
Feb (all sectors), 4
th
March (RF)
Slide7LHC cryo YETS specific points & questions
P6:Heavier corrective maintenance on QSCA (compressor station): replacement of the adsorber charcoal + consolidation with installation of an additional coalescer. Requires 4 weeks
Sequence
:
A (4
weeks) –
B (3
weeks)
Cryostart returns on 4th March.P8:Heavy corrective maintenance on QSRB (cold box): repair of a leak inside of the cold box. Requires warmup of the cold box. Planned 2 to 4 weeks.During repair, no refrigerator for quick backup in case of problem with cryoplant A.
Sequence: B (4 weeks) – A (3 weeks)
Cryostart returns on
20
th
Feb.
Request for early ELQA on sector 7-8? Possibility early January… under investigation.
Slide8Detailed schedule of the sectors
MS Excel file of K. Brodzinski
Slide9Conclusions
Cryostart until
14
Dec
2015
.
Cryostart
for all sectors back on 4th March 2016. Earlier for IP8 & IP4.The baseline is to keep the LHC arcs at 3.5 K – 4 K filled with LHe. The LSS will be
emptied
and
kept
at 20 K, the
DFBs
will
be
emptied
with
the
current
leads in cold standby.
A maintenance
schedule
has been
defined
for the
cryogenic
systems
of LHC
within
the
specified
timeframe
and
constraints
of YETS 2015.
Repairs
of a
leak
are
planned
on the QSRB cold box of IP8.
Heavier
maintenance
is
planned
on the
compressor
stations A in IP4 & IP6.
Slide10Slide11CRG preparation of YETS2015
Internally in CRG activities classified in two categories:
Affecting
other
non-CRG
systems
(no CS/CM):
this is the main subject for coordinationCRG internal «transparent» for other systemsInstrumentation and control activities for the tunnel are all planned to be
performed
during
periods
classified
as Maintenance or standby
they
are in B
category
.
N.B.:
activities
are
also
planned
on
experiments
(
mainly
CMS)
Slide12Instrumentation
Catégorie A Mise en service des capteurs Basse Pression nécessitant les supports CRG-OA pour installation + support EN-ICE/BE-CO/CRG-CE pour Layout/FEC/PVSS
Installation
capteur de pression ATLAS UX15 nécessitant les supports CRG-ME pour installation + support EN-ICE/BE-CO/CRG-CE pour
Layout/FEC/PVSS
La
consolidation des EH 500W/100W dans les triplets nécessitant les CRG-OA pour installation + support EN-ICE/BE-CO/CRG-CE pour
Layout/FEC/PVSS
Catégorie BLes events concernant l’intrumentation cryogénique listés sur le logbook*: > 100 corrective actions foreseenEssentially in the shadow of other activities and when access is possible.
N. Vauthier, TE-CRG-CI
Slide13YETS Main activities
Cat
A
P18/P2 QURC consolidation
for VFD, equipotential (for ECM issues not yet solved);
P18
QSCB equipotential cabling for motor-compressor consolidations;
P6 QSCB equipotential cabling for motor-compressor consolidations;
P8 QSC surface 24 VDC redundant;
P8 QSCB equipotential cabling for motor-compressor consolidations;
Cat B
LHC sector redeployment for EH consolidations (see CI section) ( need 1/2 day control stop per sector)
Control & electricity
M. Pezzetti , TE-CRG-OA
Essentially in the shadow of other activities
with short and localized interruptions of cryo.