Single-pass continuous-flow leach test of PNL 76-68 glass: some selected Bead Leach I results

Technical Report · Thu Aug 20 04:00:00 EDT 1981

DOI:https://doi.org/10.2172/5839380· OSTI ID:5839380

Coles, D G

A single-pass continuous-flow leach test of PNL 76-68 glass beads (7 mm dia) was concluded after 420 days of uninterrupted operation. Variables included in the experimental matrix were flow-rate, leachant composition, and temperature. Analysis was conducted on all leachate samples for /sup 237/Np and /sup 239/Pu as well as a number of nonradioactive elements. Results indicated that flow-rate and leachant systematically affected the leach rate, but only slightly. Temperature effects were significant. Plutonium leach rate was lower at higher temperature suggesting that Pu sorption onto the beads was enhanced at the higher temperature. The range of leach rates for all analyzed elements (except Pu), at both temperatures, at all three flow rates, and with all three leachant compositions varied over only three orders of magnitude. The range of variables used in this experiment covered those expected in many proposed repository environments.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5839380
• Report Number(s): UCRL-85405-Rev.1; CONF-8010130-4(Rev.1); ON: DE82000345
• Country of Publication: United States
• Language: English

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