Cesium chloride compatibility testing program. Annual report, fiscal year 1983

Technical Report · Thu Mar 01 04:00:00 EST 1984

DOI:https://doi.org/10.2172/5110562· OSTI ID:5110562

Bryan, G H

A program was started in FY 1982 to evaluate the compatibility of WESF-produced CsCl with 316L stainless steel under the thermal conditions that would be encountered in a geologic repository. The major part of the program involves compatibility testing of six standard WESF CsCl capsules at a maximum CsCl/metal interface temperature of 450/sup 0/C. The capsules are allowed to self heat to the test temperature in insulated containers and then held at temperature for 2200 to 32,000 h. After thermal aging, the capsules are destructively examined to determine the extent of the metal attack by the CsCl. This report describes the test procedure and summarizes the results obtained during the second year of the program. Metallographic examination was completed of the two zero-time capsules. The photomicrographs obtained of the metal samples indicate the maximum metal attack resulting from the capsule-filling operation was about 25 ..mu..m. Metallographic examination of the WESF CsCl capsules held at temperature for 2208 and 4392 h was completed. Both capsules exhibited substantial attack by the CsCl. Maximum attack observed in the 2208-hour capsule was estimated to be about 60 ..mu..m, while maximum attack in the 4392-h capsule was estimated at 110 ..mu..m. The data indicate the corrosion rate is linear with time for the first 4392 h. When the 4392-h capsule was opened for metallographic examination, it was found that the outer surface of the inner capsule was discolored and pitted at several locations. Metallographic examination of the affected areas showed pits up to 300-..mu..m deep in some areas. The maximum depth observed corresponded to about 9% of the initial capsule wall thickness. No similar pitting conditions observed on the outer surface of the 2208-h inner capsule; but was observed, although apparently to a lesser degree, on the outer surface of the 8784-h inner capsule. 2 references, 31 figures, 5 tables.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5110562
• Report Number(s): PNL-4847; ON: DE84010574
• Country of Publication: United States
• Language: English

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