S. Evrard EN/MEF IEFC Workshop, March 08, 2012 TCC2/TDC2
Shutdown Activities and Consolidation Plans
http://cern.ch/tcc2tdc2WG On behalf of the TDC2/TCC2 WG team
Slide 2
S.Evrard IEFC Workshop, 08.03.2012 Agenda 1.Planned works for
TAX repair 2.Other shutdown activities in the cavern: targets,
magnets, infrastructure improvements 3.List of activities for LS1
in view of operation in 2014 2
Slide 3
S.Evrard IEFC Workshop, 08.03.2012 Repair and review the North
Area TAXs TAX motor failure The TAXs, installed downstream of the
primary targets of the North Area, are made of massive blocks put
on motorized tables that can move up/down. High radiation
environment The TAX blocks intercept about 10 19 protons/year about
6 mSv/h outside the shielding and probably 30 to 40 mSv/h at the
blocks and even higher near the beam impact point 3
Slide 4
S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area
TAXs: Scope of work XTAX Repair 8 out of 12 TAX tables to be
repaired in the 2011/2012 shutdown T2, T4 TAXs : avoid compromises
to physics program as in 2011 T6 TAXs : present situation has no
impact to physics of COMPASS T6 TAXs to be repaired in LS1 Adopted
solution replace existing motors with spare ones motors showed a
rather long lifetime (10 years) they are as RADHARD as we can
presently get search for new ones ongoing but longer delays
maintain existing location underneath the TAX blocks investigated
other options but rejected due to space limitations optimize
exchange procedure for motor itself but also for the area in
general fully remote exchange using robotic manipulators under
investigation 4 T2 H2 H4 T4 H6 H8 P0 T6 M2 TT20
Slide 5
S.Evrard IEFC Workshop, 08.03.2012 5 Repair of the North Area
TAXs: scenario S. Girod EN-MEF Telescopic spring Access for
greasing screw
Slide 6
S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area
TAXs: WDP & DIMR A detailed repair procedure and a risk
analysis are prepared Major remaining risk: PR537 reliability
Technical measures taken: extensive maintenance and spare parts
Optimization steps WDP and DIMR preparation DIMR linkDIMR link
Design Review: reduce the dose in future interventions Handle TAX
assembly (blocks + table) as a set: no access to most activated
part PR537 remote control: reduced presence in TCC2 Increase PR537
lifting height: lateral shielding stays in place Bunker for
mechanical work: operators well shielded Tailor made shielding (100
mm thick steel plate + lead 50mm): dose reduction /80 Optimize
table repair sequence: # movements, start with least activated
first Extensive dry run tests in EHN1: train technicians Extensive
dry run tests in TCC2 : train crane operators 6
Slide 7
S.Evrard IEFC Workshop, 08.03.2012 7 Repair of the North Area
TAXs: dry run tests Check and validation of: Work breakdown Time
estimate & allocated resources Tooling Training sessions were
organized for each stakeholder
Slide 8
S.Evrard IEFC Workshop, 08.03.2012 8 Repair of the North Area
TAXs: DIMR detail Work breakdown & planning Dose estimateRisk
analysis Personnel involved, statistics
Slide 9
S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area
TAXs: Work Dose Planning 9 Collective dose (uSv) Individual dose
(uSv) M1: mechanics (8) M2: mechanics expert (8) T: transport (6)
RP: Radiation protection team (4) S: survey (2) Collective dose:
8.4 mSv, 36 people involved, max individual dose: 436 uSv
Slide 10
S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area
TAXs: Work Dose Planning 10 Work near the hot elements Reminder TAX
renewal in 2002: collective dose 23,9 mSv, Max individual dose 4.2
mSv
Slide 11
S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area
TAXs: Work Dose Planning 11
Slide 12
S.Evrard IEFC Workshop, 08.03.2012 Overhead crane PR532 built
in 1976 Logbook not frequently used (2001-2003: XTAX, 2006:
Shielding, 2011: Lighting renewal) Failure modes investigated
(experiences from ECN3 crane, same generation) speed variators are
the weak link. Thorough preventive maintenance and load tests
including motor electrical isolation measurements and cable
connection check. 3 speed variators were sent to and inspected by
the supplier. Auxiliary motors are available in case of motor
failure No embedded electronics (located in electrical cabinets in
safe area TA801) A remote handling controller is now installed and
new lifting jigs are available Intensive crane training with dummy
load in TCC2 is ongoing 12 Other Shutdown activities: overhead
crane upgrade
Slide 13
S.Evrard IEFC Workshop, 08.03.2012 13 Other shutdown
activities: TCC2 Targets Review of failure modes and of the
procedures to recover from each failure. Mobile shielding motor
failure is the most important failure mode. Identification of
necessary urgent consolidation actions to be done during the
2011/2012 winter stop. Mobile shielding motor replacement test and
annual target stations maintenance Review of the design and
proposal of eventual modifications during LS1 Redesign based on the
same principles: no major change but replacement of existing and
aged equipment with new generation items Preparation of ALARA
meetings for clearly identified procedures. Done for mobile
shielding motor replacement To be done for LS1 activities
Slide 14
S.Evrard IEFC Workshop, 08.03.2012 Other shutdown activities:
Vacuum repairs 14 High radioactivity + high relative humidity + PVC
(Cl) Corrosions of stainless steel elements and deterioration of
polymeric gaskets (valves mechanism) Vacuum leaks and frequent
interventions General survey of the vacuum system Visual inspection
of all vacuum chambers and bellows Protect the existing vacuum
chambers from falling acid droplets with Kapton foil Removal of Al
foils (not suited for acid protection) Chambers and splitters are
covered by Kapton foils that are tighten by stainless steel wire
Detect and repair as soon as possible suspected leak Leak found on
the end window of sector 2020, new windows under construction, will
be replaced in week 12 Replacement of two sector valves
Slide 15
S.Evrard IEFC Workshop, 08.03.2012 Other shutdown activities:
Beam line maintenance Beam lines inspection & maintenance
Collimator XCHV058 and XCHV070 exchange Vacuum leak search and fix
(sector following TAX6 up to QWL080) Protective caps installation
on 3 XCSV collimators (H2 and H4 lines) beam
Slide 16
S.Evrard IEFC Workshop, 08.03.2012 Other shutdown activities:
Magnet, Cooling and ventilation, Survey Magnets Magnet patrol
carried out last Friday (02/03) 3 Magnets to be shimmed 1 magnet to
be replaced (QNL) Will be completed in the coming weeks Cooling and
ventilation AHUs maintenance completed Inspection of water circuit
valves in view of replacement of faulty ones in LS1 Laser scanning
TDC2 and TCC2 Will allow integration and 3D modelling works in view
of LS1 Directly readable via TRUVIEW Reduce need of visit on site
ALARA 16
Slide 17
S.Evrard IEFC Workshop, 08.03.2012 List of activities for LS1:
TCC2 Targets TBIU Monitor Target Box BAC TBID Monitor Mobile
shielding motor Patch Panel Fan Switchs EquipmentTo be installed
SpareTo be manufactured TBIU T2-T4-T6- T10 (+ TBID T6) 538 TBID
T2-T4224 BAC T2-T4224 BAC T6112 BAC T10112 Collimator T10112
Total121022 Courtesy of D. Grenier (EN-STI) Budget & resources
OK for consolidation during LS1
Slide 18
S.Evrard IEFC Workshop, 08.03.2012 List of activities for LS1:
Cabling campaign 18 Replace irradiated cables, avoid unnecessary
cable length if possible, eliminate cable with PVC if possible
Cable campaign foreseen end 2013 for 4 months Only signal and
control cables (not DC cables) between patch RAL and Patch RX 700
cables = 100 km in TCC2/TDC2 for the time being End user to fill a
DIC if additionnal request TCT: Top cable tray, AA: Almost All, R:
Rest, Part: Partial. Budget & resources OK for consolidation
during LS1
Slide 19
S.Evrard IEFC Workshop, 08.03.2012 List of activities for LS1:
Air handling unit and cooling circuit 19 Leaking valve replacement
foreseen in LS1 North Area AHU consolidation planned for 2017 and
cooling station for 2021 Should be re-considered in order to solve
beam pipe stress corrosion issue (add humidity control, make
controls reliable) Increase efficiency of air ventilation: at
present the TDC2 tunnel is a dead-end and no clear air flow is set
in the extremity toward TT20. No budget nor resources for
consolidation during LS1
Slide 20
S.Evrard IEFC Workshop, 08.03.2012 List of activities for LS1:
Magnet refurbishment 20 New cooling connection for all magnets
Global replacement of EPDM/Kevlar water hoses and gaskets in TDC2 /
TCC2 Interlock: Thermometer and Manometer contacts get corroded,
triggering inconsistent machine stops; Insulation of cables is
cracked in the patch panels, the magnet safety system could
malfunction Interlock systems will need consolidation in the
future. A more modern system should be defined and implemented at
the same time. No budget nor resources for consolidation during
LS1
Slide 21
S.Evrard IEFC Workshop, 08.03.2012 List of activities for LS1:
Other activities 21 Vacuum beam pipe consolidation: Budget and
resources TBC Replace damaged vacuum chambers and bellows, add new
ion pumps T6 XTAX repair Overhead crane PR537 revamping: only
possible during LS2 General infrastructure consolidation Maintain
drain network Lights upgrade (rad hard lights to be developed)