Neptunium(V) Incorporation/Sorption with Uranium(VI) Alteration Products

Conference · Thu Apr 01 00:00:00 EST 2004

DOI:https://doi.org/10.1557/PROC-824-CC9.2· OSTI ID:1240240

Friese, Judah I.; Douglas, Matthew; Buck, Edgar C.; Clark, Susan B.; Hanson, Brady D.

An initial uranium phase that has been observed to form during the corrosion of spent nuclear fuel is the uranium oxy-hydroxide metaschoepite. It has been proposed that neptunium(V) solubility can be limited by its association with this uranium phase. Metaschoepite has been synthesized in the presence of neptunium(V) over the pH range modeled in the proposed Yucca Mountain geologic repository. Uranium (VI) phaseswere synthesized by varying pH and neptunium concentrations. Results of neptunium association with the uranium alteration phases are presented and the relationship to dissolved neptunium concentrations discussed.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1240240
• Report Number(s): PNNL-SA-44189; DF0961000
• Resource Relation: Conference: SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVIII. MRS Proceedings, 824:Paper No. CC9.2
• Country of Publication: United States
• Language: English