1. Proposal for rerouting of buried electrical networks and optical fibres at Point 1 LS2 Committee meeting S. Bertolasi on behalf on EN/EL WP17.2 HL-LHC 1 April 2016

2. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

3. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

4. Geographical overview

5. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

6. Location of power lines and optical fibres Loop BA5–BA6 (2 cables 18 kV) out of service Telephone line IT-CS-CE ? Main supply Meyrin site + machine loads LHC1 (cable 66 kV from Prévessin) Retaining wall proposition from SMB Main supply LHC loop (30 MVA cable 18 kV MP7 from Prévessin) 1 120 optical fibres (3x50mm ducts) Supply LHC1.8 (3 cables 18 kV) Supply BK6/7 (2 cable 18 kV) 23 4 56

7. Displacement proposition Power lines and OF to be displace on the other side of the retaining wall New power lines and OF routing 3 new junction chambers New trench ~85 m 1 23 4 56

8. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

9. Power lines 18 kV: users LHC1 incomer for General Services (GS) network : LHC GS loop LHC1.8 incomer for Machine net.: SHM18 (cryo for sector 1-2) + PM18 + SM18 hall LHC1.8 incomer for GS net: SHM18 + LHC1.8 LHC1.8 incomer for safety network (diesel backup) BA7 + BA6 incomer for safety network (diesel backup) LHC1.8 LHC1 Prevessin BA7 LHC1 18 kV - General Services and machine network 18 kV – Safety network (diesel back-up) LHC1.8 1 2 3 4 5 1 2 3 4 5 6 BA6 6

10. Optical fibres: users Optical fibre trunk: SR1/SM18/A (24MM) Optical fibre trunk: SR1/SM18/B (24MM) Optical fibre trunk: SR1/SM18/C (72SM) Impacted systems: -TETRA -GSM-MMC -IT network -CSAM -LASS -BIC Local permit -Timing SPS (GMT, REV) -Timing LHC -BE-BI BST -Video -White Rabbit -5 Unknown fibres / systems Total: -Total fibres: 120 -55 fibres not in use -5 fibres/systems not identified Fibres to interrupt and relocate: 65 (approx. 10 systems)

11. Impact on users and services 1 2 3 4 5 Power lines: “no impact” – resupply from LHC1 Machine net “no impact” – resupply from LHC1.8 GS net “no impact” – resupply from LHC1.8 Machine net no secured net, resupply from GS net  Estimated total intervention time : 4 weeks (not including the trenches) Optical fibres: TETRA, GSM-MMC, IT network, CSAM, LASS, BIC Local permit, Timing SPS, Timing LHC, BE-BI BST, + Unknown users Estimated services interruption: 2 days (if all the services can be interrupted at the same time and to be validated for compatibility with civil engineering and the electrical service) Estimated total intervention time : 2.5 weeks (not including the trenches) Intervention period: to be checked impact on services and LHC coordination 6 no access to underground for 7 days

12. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

13. Power lines: resources HV cables (95 m): -2x[3x1x630 Al]  48 kCHF -3x[1x400 Cu]  32 kCHF -3x[1x240 Cu]  27 kCHF -2x[3x1x70 Al]  17 kCHF -3x[1x50 Cu]  8 kCHF Accessories HV cables -6 sets (3 termination/set)  45 kCHF -21 joints  70 kCHF Trench (for power lines + OF): ~ 85m -( 1.2m deep x 2m width x 85m) 0.5 to 2 kCHF/m  170 kCHF 2 Junction chambers -2 x 25 kCHF Works supervision -1 person 5 weeks 14 kCHF Notes: Values estimated from other ongoing projects (in particular the trench, to be verified with SMB) Removal of buried ducts cables not included Holes in SE1 concrete wall and waterproofing not included Sub-TOTAL 482 kCHF 1 2 3 45 6

14. Optical fibres cables: resources 3x50mm Ducts: -Re-routing 2 empty ducts -Re-routing 1 duct in service: -3x Microduct optical fibre cables (120 optical fibres) Optical fibre installation works cost  53 kCHF Junction chamber  25 kCHF Sub -TOTAL 78 kCHF Not included: - Trench (included in the power lines estimation) -Making accessible the buried ducts next to the location of the new pulling chamber. -Removal of buried ducts and fibre cables Power lines and Optical Fibres cables, total estimated cost : TOTAL 560 kCHF

15. Agenda Geographical overview Location of power lines and optical fibres Displacement proposition Users and impact Resources Summary and EN-EL recommendations

16. Total duration of the works 4 weeks. Phase of the works with major impact on users: at least 7 days for power lines and 2 days for OF. Can be longer, in case of adverse climatic conditions. Delays might impact accelerators planning. During EYETS, these works present bigger risks Cryogenics for sector 1-2 in service, but can be resupplied Works will be done by powering off in two stages (power line 1 first, then 2/3/4/5/6) Intervention period to be defined by HL-LHC project + LHC coordination + SM18 coordination: For fibres optics services interruptions  for 2 days simultaneous interruption of all services BA6/BA7/PM18 underground  no access during power off for at least 7 days Other EL activities planned for EYETS, priority to be defined (other activities already planned to be dropped) EL recommends to execute these works during LS2, if necessary

18. Additional slides

19. LHC1 - Pictures

20. Optical fibres list of users