Combined Mechanical and Electrical Testing of a Full-Scale TF Shear Key Prototype

  • P. E. Fabian
  • R. P. Reed
  • J. B. Schutz
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

To assist in the ongoing research and development program for the International Thermonuclear Experimental Reactor (ITER), a full-size prototype of the toroidal field (TF) shear keys to be used in ITER was tested at 77 K. The most critical aspect of the shear key design is the composite insulation, which must withstand mechanical and electrical loads, have good fatigue characteristics, and maintain its properties under high levels of radiation. All components included in the current ITER design, such as the TF shear plates, composite insulation, shear key liners, and shear keys, were included in the prototype test. The preimpregnated insulation system, combined with an electrical barrier, was fabricated using a vacuum bag/ autoclave process. The mock-up was tested in tensile fatigue with a maximum load of 3.2-MN (720-kip). A 5-kV potential was placed across the composite insulation at regular intervals during the test, with no drop in resistance recorded.. Both mechanical and electrical testing was conducted while the prototype was submersed in liquid nitrogen (77 K). The test was planned to proceed to a maximum of 8 × 105 cycles, but failure of the test rig assembly occurred at 5.75 × 104 cycles, causing the termination of the test. The composite insulation system performed well throughout the test.

Keywords

Toroidal Field International Thermonuclear Experimental Reactor Insulation System Shear Plate Composite Insulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    C. Bushnell and R. Vieira, Memorandum N 11 MD 01 94–10–14 F, 2nd ICG Meeting minutes, September 19–20, 1994, Oxford, UK (1994).Google Scholar
  2. 2.
    P. Titus, Memorandum to B. Montgomery, “Key Insulation stresses and recommendations for testing,” January 11, 1994, Massachusetts Institute of Technology, Boston, Massachusetts, USA (1994).Google Scholar
  3. 3.
    N.J. Simon and R.P. Reed, Structural materials for superconducting magnets, AISI 316 stainless steel, report to Department of Energy, Office of Fusion Energy by US Department of Commerce, National Institute of Standards, Boulder, Colorado, (June 1982.)Google Scholar
  4. 4.
    P.E. Fabian, J.B. Schutz, CS. Hazelton, and R.P. Reed, Screening of candidate insulation systems for ITER TF coils, report to MIT Plasma Fusion Center on contract numbers FCA 359063 and FCA-251317–003C, Composite Technology Development, Inc. and Cryogenic Material, Inc., Boulder, Colorado (August 15, 1993).Google Scholar
  5. 5.
    P.E. Fabian, J.B. Schutz, CS. Hazelton, and R.P. Reed, Candidate ITER insulation materials characterization report, report to MIT Plasma Fusion Center on contract numbers FCA 359063 and FCA-251317–003C, Composite Technology Development, Inc. and Cryogenic Material, Inc., Boulder, Colorado (January 30, 1994).Google Scholar
  6. 6.
    R.P. Reed, P.E. Fabian, J.B. Schutz, T.S. Bauer-McDaniel, C.S. Hazelton, and N.A. Munshi, US/TTER insulation irradiation program, updates I-IV, reports to MIT Plasma Fusion Center on contract numbers FCA 359063 and FCA-251317–003C, Composite Technology Development, Inc. and Cryogenic Material, Inc., Boulder, Colorado (October 10, 1993; June 20, 1994; August 4, 1994; December 9, 1994).Google Scholar
  7. 7.
    R.P. Reed and P.E. Fabian, Large-scale test of US shear-key module, report to MIT Plasma Fusion Center on contract number FT-S-549840, Composite Technology Development, Inc. and Cryogenic Material, Inc., Boulder, Colorado (March 15, 1995).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • P. E. Fabian
    • 1
  • R. P. Reed
    • 2
  • J. B. Schutz
    • 1
  1. 1.Composite Technology Development, Inc.BoulderUSA
  2. 2.Cryogenic Materials, Inc.BoulderUSA

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