Abstract
Sectioning of the WESF /sup 90/SrF/sub 2/ capsule held at 800/sup 0/C for one year was completed. Ring sections cut from the Hastelloy C-276 inner capsule will be shipped to ORNL for examination. Design of the prototype outer capsule has been completed. The design calls for a capsule having a 0.5-in. wall thickness. An order has been placed with Cabot Corporation to supply the materials for the prototype outer capsules and to fabricate the capsule parts. Delivery of the capsule components is scheduled for July of this year. Tests lasting up to 10,000 hr and measuring the rate of oxidation of Hastelloy S and Hastelloy C-4 in air at 600/sup 0/ to 800/sup 0/C have been completed. Specimens oxidized for 5000 to 10,000 hr exhibited erratic oxidation behavior, apparently because of spalling of the oxide layer. Hastelloy S and Hastelloy C-4 specimens exposed to flowing seawater for 7500 hr suffered very little corrosion. Some isolated pitting to a depth of 0.1 mils was evident in the 7500-hr specimens. The corrosion, however, had no significant effect upon the room-temperature tensile properties of the two alloys.
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