During the examination of the pins from in-pile autoclave L6Z-114 it was noted that each of the doublenotched pins exhibited areas of increased corrosion while the exact duplicate single-notched pins did not. The two pairs of Zircaloy- 2 pins were identical in structure and thus the noted differencs in corrosive attack cannot be attributed to this factor. In the Zr-1.5% Sn--15% Nb pins the corrosive attack did not seem dependent on the slight variation in structure of the pins. (W. L.H.)