S.Evrard - EN-MEF XTAX table repair 1 12 tables repaired 8 initially foreseen (T2+T4) + 4 repaired in addition (T6)

S.Evrard - EN-MEF Story-board (I) 2 1 Bunker assembly 2 shielding roof removal 3 service disconnection 4 table handling (see beam tracks )

S.Evrard - EN-MEF Story-board (II) 3 5 spring removal 6 old motor removal 7 new motor installation 8 table back handling

S.Evrard - EN-MEF New hardware implemented on this worksite 1.PR537 crane made remotely controlled 2.Vision system deployed (10 cameras) 3.New remote controlled lifting jigs (1 and 2 hooks) 4.Inspection & Remote RP survey tool 5.On-line dosimetry 6.Improved communication means (headsets, audio conference during repair)

S.Evrard - EN-MEF XTAX table routing in TCC2 5 Dry run with dummy table routing accurately defined (X,Y,Z) and tested T2 T4 T6

S.Evrard - EN-MEF Encountered challenging situations Date débutDate finDifficultéSolution Ven 02/03Ven 16/03 Personnel FSU et Altead pas conforme dosimétrie Formation PCR et commande dosimètre en urgence Lun 12/03Ven 16/03Vanne départ flexible cooling pas étanches Pose de nouvelles vannes supplémentaires étanches + aspiration eau répandue au sol et stockage dans container 1m3 Mar 13/03 Palonnier automatique : 1 axe se coince lors de lengagement ou lors du dégagement de façon aléatoire Remplacement de deux boites daxe automatique + tests concluants Mer 11/04 Retrait moteur et accouplement compliqué sur table avale XTAX Chauffer au chalumeau laccouplement et utilisation de vérin Jeudi 12/04 Casse embouts vis pression clavette au remontage moteur Pose pas de problème au démontage futur car retrait demi-coquille enlève toute pression sur clavette : laissé comme cela Jeudi 12/04Vendredi 13/04Mauvais positionnement table T4 amont P0 Repositionnement coupelle voir doc recovery action Jeudi 12/04Vendredi 13/04 Vis interface grille cassée. Morceau coincé dans taraudage Clamp ad hoc Lundi 16/04Mercredi 25/04 Depuis remise en eau XTAX T2 et T4 : fuite sur aimant MSN ligne H4 downstream XTAX Isolement, décapotage aimant, remplacement joint défectueux Mer 18/04 Retrait moteur et accouplement compliqué sur table avale XTAX 06 Arrache poulie utilisé 6

S.Evrard - EN-MEF Recovery action on 13/04/2012 During its removal, one cup housing the downstream right foot of the table felt down and must be repositioned. Once re-installed, the table turned out to be misaligned by 4 cm at the level of the positioning grid system Investigation on spare parts confirm our feeling of a wrong repositioning of the cup. Decide an inspection on site Dose rate estimate around 20 mSv/h shielding required Shielding installation ( L shape 4 cm thick lead dose rate reduced to 2.3 – 2.7 mSv/h) Removal of the felt down cup + 3 rollers & inspection of the 2 other cups Replacement by spare parts 7

S.Evrard - EN-MEF Quality Assurance plan One slip by repaired table Who did what, when, how,… Motor test report Test in laboratory (motor only) Test in the bunker (motor + gearbox) Final test in place (motor + load, full range tested) 8 H2 aval

S.Evrard - EN-MEF Dosimetry stats 9

S.Evrard - EN-MEF Dosimetry stats 10

S.Evrard - EN-MEF Dosimetry stats 11 Motor repair procedure very well studied and optimised real dose <<<< estimates Proximity intervention less optimised real doses = estimates Ways of improvement : cold cell or new connection design

S.Evrard - EN-MEF Dosimetry stats 12 Self-commitment of max 600 uSv/ person under control