Gas Generation Testing of Neptunium Oxide Generated Using the HB-Line Phase IIFlowsheet

Duffey, J

Savannah River Site (S.C.)

关键词: Flowsheets;    Testing;    Specific Surface Area;    Neptunium;    08 Hydrogen;   

DOI  :  10.2172/890150
RP-ID  :  WSRC-TR-2003-00389
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  890150

美国|英语

来源: UNT Digital Library

【 摘 要 】

The hydrogen (H{sub 2}) gas generation rate for neptunium dioxide (NpO{sub 2}) samples produced on a laboratory scale using the HB-Line Phase II flowsheet has been measured following exposure to 75% relative humidity (RH). As expected, the observed H{sub 2} generation rates for these samples increase with increasing moisture content. A maximum H{sub 2} generation rate of 1.8 x 10{sup -6} moles per day per kilogram (mol {center_dot} day{sup -1} kg{sup -1}) was observed for NpO{sub 2} samples with approximately one and one-half times (1 1/2 X) the expected specific surface area (SSA) for the HB-Line Phase II product. The SSA of NpO{sub 2} samples calcined at 650 C is similar to plutonium dioxide (PuO{sub 2}) calcined at 950 C according to the Department of Energy (DOE) standard for packaging and storage of PuO{sub 2}. This low SSA of the HB-Line Phase II product limits moisture uptake to less than 0.2 weight percent (wt %) even with extended exposure to 75% RH.