ORNL-1771 - Oak Ridge National Laboratory

ANP QUARTERLY PROGRESS REPORT
Fig. 7.16. Tub-to-Header Joint Showing Severe Cracking. Etched. lOOX,
particularly since the columnar dendrites, which Corrosion tests in static sodium and in fluoride
arc typical of a weld structure, are aligned in such mixtwrcs indicate that a 67% Ni-13% Ge-11% Cr-6%
a way as to aid parallel fractures. Si-?% Fe-1% Mn alloy niay be useful for this ap-
This investigation emphasizes the extreme de- plication, This alloy, which flows well at 2050"F,
sirability of using bock-brazing as n means for was found to be virtually unattacked in the fluoride
minimizing the notch effect and for reducing the fuel arid corroded to a maximum of 4 mils in 100 hr
possibilities of leaks developing in the system. at 1500°F in sodium.
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