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Bharat Doshi Project Manager (ITER-India) Institute for Plasma Research,Gandhinagar,India

Materials & Manufacturing Technologies requirement for Cryostat & Vacuum Vessel In-wall shield System of ITER. Bharat Doshi Project Manager (ITER-India) Institute for Plasma Research,Gandhinagar,India. WSFT-IPR-Gandhinagar. 23 rd July 2008. Out line of the Presentation.

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Bharat Doshi Project Manager (ITER-India) Institute for Plasma Research,Gandhinagar,India

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  1. Materials & Manufacturing Technologies requirement for Cryostat & Vacuum Vessel In-wall shield System of ITER Bharat Doshi Project Manager (ITER-India) Institute for Plasma Research,Gandhinagar,India WSFT-IPR-Gandhinagar. 23rd July 2008

  2. Out line of the Presentation • Introduction to ITER & ITER Systems • Cryostat & In-wall Shield System description • Material requirements for Vacuum Vessel In-wall shield system • & Cryostat System • Manufacturing Technologies needed for Cryostat System • & Vacuum Vessel In-wall shield system • Summary 2 WSFT-IPR-Gandhinagar.

  3. INTERNATIONAL THERMO-NUCLEAR EXPERIMENTAL REACTOR (ITER) ITER is “one of its kind”, and it will be the first biggest nuclear fusion facility to be licensed in cadarache, France. • Major systems includes…….. • Super conducting Magnets (CS,PF &TF) • Vacuum Vessel (plasma chamber) • First wall (Blanket modules, Divertor cassettes,Limiters etc.) • Cryostat,VVPSS & Thermal shields • Vacuum Pumping systems • Heating & current drive systems • Diagnostics • Cryoplant & Cryodistribution • Cooling water system • Tritium plant • Power supplies • CODAC Fusion Power: 500 MW Plasma Volume: 840 m3 Nominal Plasma Current: 15 MA Typical Density: 1020 m-3 ITER construction is multidimensional, multicultural and spread across many time zones 3

  4. INDIAN CONTRIBUTION (9- PROCUREMENT PACKAGES) Diagnostic Neutral Beam (WBS : 5.3.7) RF sources & monitoring and control for IC H&CD (WBS : 5.1.3) Gyrotrons for plasma start up(WBS : Power supplies for DNB, RF, Gyrotrons (WBS : 5.1.4, 5.2.4, 5.5) Cryostat WBS : 2.4 Diagnostics (3.5%) WBS : 5.5 Industrial Projects Vacuum vessel in wall shields WBS : 1.5 Cryo distribution & cryo line system (WBS : 3.4) ITER heat rejection, component cooling and chilled water system WBS : 2.6 R & D Projects 4 WSFT-IPR-Gandhinagar.

  5. ITER Cryostat System Cryostat WSFT-IPR-Gandhinagar.

  6. Cryostat System Functions • Cryostat shall form a vacuum tight container, surrounding the entire Tokamak Basic Machine. It shall provide the vacuum for the super-conducting magnets, and shall form part of the secondary confinement barrier for radioactive inventory inside VV. The cryostat shall include overpressure protection for itself. • Cryostat allows passive removal of decay heat, from VV & In vessel components. • Cryostat has penetrations for magnet feeders, water cooling pipes, instrumentation feed-through, cryostat pumping systems etc. • Cryostat has penetrations for access to the VV ports (45 ports). • Cryostat has penetrations for access, for maintenance equipment, into the cryostat. • Cryostat has penetrations for access to the CS & PF coil, for possible removal. • Cryostat shall transfer all the loads that derive from the tokamak basic machine, & from the cryostat itself, to the floor of the tokamak pit through its support structures (during the normal & off-normal operational regimes, and at specified accidental conditions). WSFT-IPR-Gandhinagar.

  7. Cryostat System configuration • Cryostat is a cylindrical pressure vessel, with its axis vertical, and with a flat bottom and a tori-spherical top. • The maximum diameter of the outer cylindrical part shall be ~ 29 m. • The diameter of outer cylindrical part shall reduce to ~19 m below the VV divertor ports. • These two cylinders of different diameters shall be connected to a horizontal ring, which shall be the platform to cater for the TF magnets and the vacuum vessel. • The horizontal ring shall be supported by 18 pillars installed on the pit floor. • The port penetrations shall be connected to VV port ducts and bioshield port cells by metallic bellows to compensate all relative movements. • Cryostat bottom end shall be just above the pit floor level. • Cryostat shall be connected to vacuum pumps and the vacuum monitoring system. WSFT-IPR-Gandhinagar.

  8. Design & Performance Requirements WSFT-IPR-Gandhinagar.

  9. Cryostat Performance Requirements WSFT-IPR-Gandhinagar.

  10. Deliverables • One Full Cryostat • Factory fabrication + ITER Site • fabrication • + Tokamak hall installation • Top dome shaped upper head • Upper Cylinder • Lower Cylinder • Base Section • Cryostat penetrations • Cryostat support structure • Gravity support columns • Cryostat venting & overpressure • protection system 580.495 MT 616.037 MT 654.002 MT 1384.347 MT WSFT-IPR-Gandhinagar.

  11. Factory Fabrication Maximum size of 60degree segment. ·      Length : 10189.89mm ·      Width : 14520mm ·      Height : 3750mm  Material: SS304L Weight: 75496Kg Maximum size of 60 degree segment. ·      Length : 14600mm ·      Width : 9085mm ·      Height : 2375mm Material: SS304L Weight: 88436Kg Maximum size of 60 degree segment. ·      Length : 14600mm ·      Width : 9867.5mm ·      Height : 2375mm  Material: SS304L Weight: 88436Kg ·      Length : 4320 mm ·      Width : 1350 mm ·      Height : 1350 mm Material: SS304 Qty. :18 Maximum size of 60 degree segment. ·      Length : 12639mm ·      Width : 14650mm ·      Height : 6155mm Material: SS304L Weight:183276 Kg WSFT-IPR-Gandhinagar.

  12. Site Fabrication Lower Cylinder Assembly Upper Cylinder Assembly Base Section Assembly Top Lid Assembly 12 WSFT-IPR-Gandhinagar.

  13. Site Assembly in ITER hall Each assembly being moved in ITER hall Field weld Joint in ITER hall & NDT (~ 300 m) ITER Tokamak building With Cryostat Assembled 13 WSFT-IPR-Gandhinagar.

  14. R&D in Welding Technology 3A. Hybrid Welded 316 LN 20 mm thick plate 1. NG-TIG weld in 40 mm thick SS316L plate Hybrid Set-up Hybrid Configuration 3B. 316 LN Tube Hybrid welded 4A. RPEB weld in 60 mm thick 316L 2B. Laser weld 20 mm AISI 304L plate 4B. RPEB welds 2A. Laser weld 60 mm SS in 13 passes 14

  15. WELDING REQUIREMENTS • Total length of full penetration weld joints of 60 mm thick plate for site assembly ~ 350 m • Total weight of deposited metal during site assembly ~1200 Kg. • Many welding machines to operate in synchronization for these joints • Total length of full penetration weld joints of 60 mm for sub-assemblies = 700 m (approx.) • Total weight of deposited metal for sub-assemblies ~ 2100 Kg. • Requirement for welding automation (TIG, MIG, SMAW) • Various new welding technology like RPEBW, NGTIG needs to be developed. WSFT-IPR-Gandhinagar.

  16. ITER VV-IWS BLOCKS • To stop energetic neutron within vessel boundary and to reduce TF ripple. • ITER vacuum vessel is double wall construction. Space between outer shell and inner shell is used for placing VV-IWS Blocks. Typical in-board VV-IWS Block Out-board VV-IWS Blocks assembled WSFT-IPR-Gandhinagar.

  17. ITER VV-IWS BLOCKS ASSEMBLY Shield block assembly ITER VV SECTOR ITER VV ASSEMBLY VV In-wall shield segmentation

  18. Material Requirements • ~ 6000 blocks for VS and VS joints. Total weight of fabricated blocks is approximately 1777 t. • Following different materials are required for VV-IWS blocks • SS 304B4 (40 mm thick plates) : 1735 t • SS304B7 (40 mm thick plates) : 0134 t • SS430 (40 mm thick plates) : 350 t • SS 316 L(N)(IG2) (40-60 mm thick plates) : 100 t • XM-19 (30 – 50 mm diameter round bars) : 50 t WSFT-IPR-Gandhinagar.

  19. SS304 B4 • 304B4 type, Grade B austenitic stainless steel plates for neutron shielding inserts in the inboard region in the ITER Vacuum Vessel, conform to ASTM A 887-89 (2004). WSFT-IPR-Gandhinagar.

  20. SS304 B7 • 304B7 type, Grade B austenitic stainless steel plates for neutron shielding inserts in the inboard region in the ITER Vacuum Vessel, conform to ASTM A 887-89 (2004). WSFT-IPR-Gandhinagar.

  21. SS316LN (IG2) Unspecified elements contents as low as possible and not exceeding trace element level. Ta + Nb + Ti 0.15 % WSFT-IPR-Gandhinagar.

  22. SS430 Chromium stainless steel plate type 430 (UNS S43000) for ferromagnetic inserts for the ITER Vacuum Vessel. WSFT-IPR-Gandhinagar.

  23. Summary Material required for Vacuum Vessel In-wall Shield System & Cryostat of ITER WSFT-IPR-Gandhinagar.

  24. Summary Manufacturing Technologies required to be developed for Cryostat & Vacuum Vessel In-wall Shield System of ITER • Advanced Cutting • Plasma • YAG Laser • Water jet • Welding Technology • NGTIG (Hot wire NGTIG) • MAG • RPEB • YAG LASER • (Wire-fill Laser without shielding gas/with shielding gas) • Laser-MIG Hybrid • NDT technology (RESTRICTED ACCESS) • UT(Augur, Phased Array, TOFD) • RT • PT WSFT-IPR-Gandhinagar.

  25. Thank you for your attention 25 WSFT-IPR-Gandhinagar.

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