29th Symposium on Fusion Technology (SOFT 2016)

P2.026 Development of prototype elements for beamline components for ITER DNB and Indian test facility

6 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 26

Poster B. Plasma Heating and Current Drive P2 Poster session

Speaker

Chandramouli Rotti (Diagnostic Neutral Beam)

Description

The Beam Line Components (BLCs) for the ITER Diagnostic Neutral Beam (DNB) and Indian Test Facility (INTF) are mainly water cooled elements made from CuCrZr which are designed to absorb heat flux up to 10MW/m² 2 (e.g. Heat Transfer Element for calorimeter) according to their position in beam line. The design of these components imposes stringent requirements of having the specific chemistry of base material. Further, manufacturing involves dissimilar material welding and specific design for welds to enable full volumetric examination of the weld joint, tight tolerances on deep drilling of coolant passage over a length of ~2m,etc. The manufacturing process sequencing needs to be optimized with respect to the process and the corresponding material conditions. To address the above requirements, full scale technology development program has been undertaken which includes: i) development of the CuCrZr material with the unique melting technology to have the desired embrittlement, chemical and mechanical properties along with defining the aging cycle. ii) deep drilling of cooling channels of dia. 16 mm within 18mm thick plate over a length of 1500 mm with maintaining a drift less than 0.5 mm to achieve the designed cooling efficiency iii) Electron Beam welding of various dis-similar material combination like CuCrZr- Ni, OF Copper –Ni & Ni-SS which can further be inspected 100% with volumetric examination techniques. In addition to this, practical manufacturing problems have been addressed in terms of overcoming the deformation during the thermo-mechanical treatments of elements by manufacturing process sequence optimization. The paper shall present the consolidated results of various experiments during this development which has been carried out at NFTDC, Hyderabad, India. This indigenous development is expected to be used as a guideline during the manufacturing of Heat Transfer Elements for Calorimeters, panels for Neutralizer and tube elements for RID.