1. Atlas standard opening ATLAS Project Document N°: ATL-HT-OP-0014 EDMS id. 983012 Created : January 13 th, 2009 Modified : Main document Overall view of the opening sequence List of procedures to be applied at each step Prepared by : Michel RAYMOND Checked by :Approved by :

2. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide CSide ASide C Run configuration In run, the components dedicated to the movement of the detectors are stored at surface. The first operation, as soon as shaft C is opened, is to lower these equipments and to connect them. The heavy trucks are compressed and used to support JFS shielding. The light trucks are at surface, ready to be lowered and used as support structure for the Toroid end caps. 2

3. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide CSide ASide C Step 1 : shielding removing Day 1 Lifting of Top JFS – side A Lifting of Top JFS – side C Connection of Movement system Side A Day 2 Day 3 X-movement of JFS - A Lifting of JFS - AConnection of Movement system Side C Day 4 Lifting of JF table - A Lifting of compressed truck - A 3

4. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide CSide ASide C Step 1 : shielding removing (2) Day 5 BW-A opening & tilting Rails re-arrangement Trench A Rotation of traction cylinders Mounting of JF table (A) Day 6 Lowering of compressed truck – AX-movement of JFS - C Lowering of JF table - ALifting of JFS - C Day 7 Truck A connectionLifting of JF table - C X-movement of truck ALifting of compressed truck - C 4

5. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide C Side A Step 1 : shielding removing (3) Day 8 JFC2 & JFC3 to surface (A)BW-C opening & tilting Rails in trench C Rotation of traction cylinders JFC1 platform installation (A) Mounting of JF table (C) Day 9 X-movement of truck & JFC1 (A) Lowering of compressed truck (C) Lowering of JF table - C Day 10 Lifting of JFC1 (A)Truck C connection Lifting of JF table (A)X-movement of truck C 5

6. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide C Side A Step 1 : shielding removing (4) Day 11 JFC2 & JFC3 to surface (C) JFC1 platform installation (C)Lifting of compressed truck (A) Day 12 X-movement of truck & JFC1 (C) Removing of A-frame (A) Light truck lowering (A) Day 13 Lifting of JFC1 (C)Light truck positioning (A) Lifting of JF table + truck (C) Movement system connection (A) Day 14 Removing of A-frame (C)Lowering of folding bridges Light truck lowering (C)ECT-A opening 6

7. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide C Step 2 : Barrel opening - A side Day 15 Light truck positioning (C)Release of JD locking devices (A) Lowering of Round scaffolding (A) JD-A connection Day 16 JD-A opening Day 17 EB-A connection Movement system connection EB-A opening Day 18 Installation of folding bridges ECT-C openingRound scaffolding installation Side C Side A 7

8. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Side ASide C Step 3 : Barrel opening - C side Day 19 Release of JD locking devices (C) Round scaffolding installation (A) Lowering of folding bridges JD-C connection Lowering of Round scaffolding (C) Day 20 JD-C opening Day 21 EB-C connection EB-C opening Installation of EB-A or JD-A access Day 22 Installation of folding bridges (C) Round scaffolding installation (C) Side C Side A 8

9. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 Step 4 : Access completion Day 23 Round scaffolding installation (C) Day 24 Installation of EB-C or JD-C access Day 25 Side ASide C Side A 9

10. ATL-HT-OP-0014EDMS id : 983012Atlas standard opening : Main documentPage / 10 List of procedures List of tooling for shielding removingATL-HT-OP-0010, EDMS Id 970117 JFS3 Removing using compressed truckATL-HT-OP-0009, EDMS Id 969888 BW movementATL-HT-OP-0012, EDMS Id 972580 JFC2 & JFC3 removingATL-HT-OP-0009, EDMS Id 969888 JFC1 removing using compressed truckATL-HT-OP-0009, EDMS Id 969888 Truck lowering and connectionATL-HT-OP-0011, EDMS Id 971453 TE movementATL-HT-OP-0011, EDMS Id 971453 JD/SW movementATL-HT-OP-0011, EDMS Id 971453 AE movementATL-HT-OP-0011, EDMS Id 971453 PPSPS for ATLAS opening operationATL-HT-EY-0003, EDMS Id 971452 PPSPS for Shielding removingATC-TY-EY-0116, EDMS Id 971609 PPSPS for Big Wheels movementATC-TY-EY-0115, EDMS Id 971615 10