Post-Irradiation Examination of Array Targets - Part I

Icenhour, A.S.

Oak Ridge National Laboratory

关键词: Post-Irradiation Examination;    Irradiation;    Neptunium;    Pressure Measurement;    Processing;   

DOI  :  10.2172/885872
RP-ID  :  ORNL/TM-2003/220
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  885872

美国|英语

来源: UNT Digital Library

【 摘 要 】

During FY 2001, two arrays, each containing seven neptunium-loaded targets, were irradiated at the Advanced Test Reactor in Idaho to examine the influence of multi-target self-shielding on {sup 236}Pu content and to evaluate fission product release data. One array consisted of seven targets that contained 10 vol% NpO{sub 2} pellets, while the other array consisted of seven targets that contained 20 vol % NpO{sub 2} pellets. The arrays were located in the same irradiation facility but were axially separated to minimize the influence of one array on the other. Each target also contained a dosimeter package, which consisted of a small NpO{sub 2} wire that was inside a vanadium container. After completion of irradiation and shipment back to the Oak Ridge National Laboratory, nine of the targets (four from the 10 vol% array and five from the 20 vol% array) were punctured for pressure measurement and measurement of {sup 85}Kr. These nine targets and the associated dosimeters were then chemically processed to measure the residual neptunium, total plutonium production, {sup 238}Pu production, and {sup 236}Pu concentration at discharge. The amount and isotopic composition of fission products were also measured. This report provides the results of the processing and analysis of the nine targets.