FABRICATION OF THE HEAT EXCHANGER TUBE BUNDLE FOR THE MOLTEN-SALT REACTOR EXPERIMENT
The INOR-8 tube bundle of the primary heat exchanger of the Molten-Salt Reactor Experiment contains 163 1/2-in. dia. x 0.042-in.-wall U-tubes welded to a 1 1/2-in.-thick tube sheet, 17 in. in diameter. Procedures were successfully developed for welding and back brazing the closely spaced 326 tube-to-tube sheet joints in the unit. Trepan grooves were machined in the weld side of the tube sheet so that low-restraint edge-type welds could be made. The 82 Au18 Ni (wt%) brazing alloy used is corrosion resistant, ductile, and produces joints exhibiting satisfactory mechanical strength. A unique joint design incorporating a trepan groove and feeder holes was used for the braze side. Nondestructive inspection of the welds revealed no defects. Good general flow of the brazing alloy was evident, and ultrasonic examination of brazed joints showed only minor scattered porosity. The completed unit passed both heliumleak and 800-psi hydrostatic tests. (auth)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-18-004214
- OSTI ID:
- 4130352
- Report Number(s):
- ORNL-3500
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- United States
- Language:
- English
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