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XTAX table repair

XTAX table repair. 12 tables repaired 8 initially foreseen (T2+T4) + 4 repaired in addition (T6). Story-board (I). 1 Bunker assembly 2 shielding roof removal 3 service disconnection. 4 table handling ( see beam tracks ). Story-board (II).

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XTAX table repair

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

  2. Story-board (I) 1 Bunker assembly 2 shielding roof removal 3 service disconnection 4 table handling (seebeamtracks )

  3. Story-board (II) 5 springremoval 6 oldmotorremoval 7 new motor installation 8 table back handling

  4. New hardware implemented on this worksite • PR537 crane made remotely controlled • Vision system deployed (10 cameras) • New remote controlled lifting jigs (1 and 2 hooks) • Inspection & Remote RP surveytool • On-line dosimetry • Improved communication means (headsets, audio conferenceduringrepair) 2 4 3 5

  5. XTAX table routing in TCC2 Dry runwithdummy table  routingaccuratelydefined (X,Y,Z) and tested T2 T4 T6

  6. Encountered challenging situations

  7. Recoveryaction on 13/04/2012 • During its removal, one cup housing the downstream right foot of the 043018 table felt down and must be repositioned. • Once re-installed, the table 043018 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

  8. 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) H2 aval 021025

  9. Dosimetry stats

  10. Dosimetry stats

  11. Dosimetry stats Motorrepairprocedureverywellstudied and optimised real dose <<<< estimates Proximity intervention lessoptimised  real doses = estimates Ways of improvement : cold cell or new connection design

  12. Dosimetry stats Self-commitment of max 600 uSv/ personunder control

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