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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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S.Evrard IEFC Workshop, 08.03.2012 Repair of the North Area TAXs: Work Dose Planning 11

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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)