1. 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 ‣ AHU’s 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

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

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

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

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

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)