Euratom Mechanical operation on the TPL sector E.Delmas – December 8th 2006 1/13 Disassembly and reassembly of a sector of the Toroidal Pumped Limiter.

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 1/13

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Disassembly and reassembly of a

sector of the Toroidal Pumped

Limiter

Technical procedure

Difficulties during operation

Task schedule

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Double ring assembly of twelve 30° sectors (5m diameter, 1.6m height)

Upper ring actively cooled with water (3.5MPa, 120°C)

Hydraulic connection(Helicoflex seals)

Mechanical connection between sectors

Welded connection for plate’s pipes

30° sector

Mechanical connection with

plate

Mechanical connection with column support

Technical procedureGeneral concept and interfaces of the TPL

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 3/13

EuratomTechnical procedureOpening of the torus for extraction

FCI antenna removal necessary in order to take out

the sector

ICRH Port

TPL Sector

Torus

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 4/13

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ICRH Port

Upper circular rail and lifting gear for TPL sectors handling

Rail for extraction from the vacuum chamber

Technical procedureLifting and Handling tools

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 5/13

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Torustesting hall

Technical procedureTransfer and radiation control

Sector transferred to a temporary storage zone

Radiation control of the components

Safety authorization granted to work on the part

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 6/13

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Torus Testing hall

Transfer and initiation of the work

Sector transferred to the workshop area

Technical procedure

Workshop

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 7/13

EuratomTechnical procedureHandling tools

Placing the sector on the handling tools

Physical studies can now begin

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 8/13

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Welded connections for cooling

Mechanical connections of fingers with TPL’s structure

Technical procedureFinger disassembly

Removal of water cooling pipes and connectors

Assembling the new fingers (verified)

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Maximum allowed leak rate is :

• 5.10-10 Pa.m3.s-1 at 20°C

• 5.10-9 Pa.m3.s-1 at 200°C.

0

50

100

150

200

250

1 2 3 4 5 6 7 8 9 10 11 12 13 14

days

cooling circuit up to 40 bars

cooling circuit up to 60 bars

tem perature °C

Technical procedureLeaktightness Test

Carried out in a vacuum vessel

Thermal cycling of the components (20 to 200°C)

Cooling circuit is pressurized with helium (6MPa at 20°C and 4 MPA at 200°C)

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 10/13

EuratomTechnical procedure

Reversed operation for

the disassembly

Sector insertion

Re-installation

Reassembling of the ICRH antenna

Reassembly

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 11/13

EuratomDifficulties

Difficulties:– Limited working area– Fragile components nearby– Heavy and fragile components– Delay in case of difficulties– Tore Supra cannot restart without the sector

Our advantages:– Well-known and perfected procedures– An experienced and competent personnel– Mastered intervention procedures on low level radioactive parts– Available tools– Experience gained from the operation in 2000 and 2002

Mastering a complex and delicate operation

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 12/13

EuratomScheduleFitting this work into the operation of Tore Supra

Need to remove an ICRH antenna (May 2007)

Need to remove an antenna in order to take out the sector

May 2007 is the best time to carry out the operation

Mechanical operation on the TPL sector E.Delmas – December 8th 2006 13/13

EuratomScheduleTask Schedule

2 weeks of plasma

Radiation control

PhysicalMeasurements

Disassemblyof fingers

Assemblyof spare fingers

Qualificationtest

6 weeks