In:
MRS Proceedings, Springer Science and Business Media LLC, Vol. 932 ( 2006)
Abstract:
The dissolution of irradiated HTR UO 2 -ThO 2 fuel particle under reducing conditions was studied using a continuous flow-through reactor and compared to the dissolution of unirradiated fuel particle in the same condition. The irradiated fuel particle was leached for more than eight months. A fast 137 Cs release was observed, corresponding to a labile fraction (“instant release fraction”). Then, a congruent leaching of 137 Cs and 90 Sr was measured corresponding to a matrix dissolution rate equal to 1.7 mg/m 2 /d. A slower release of 238 Pu probably due to sorption phenomena is observed. Dissolution rates are 100-2000 times higher than for unirradiated material. We can conclude that alpha-radiolysis is responsible for this increase due to local oxic conditions. However we cannot exclude that due to irradiation the accessible surface area has been increased as well. The coating of this irradiated particle was equally studied to determine the presence of different radionuclides and their leaching properties of leaching
Type of Medium:
Online Resource
ISSN:
0272-9172
,
1946-4274
DOI:
10.1557/PROC-932-70.1
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2006
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