Gel-Addition Process Chemical Studies: Quarterly Progress Report Number 18, November 1970 - January 1971 Page: 5-1
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5. IRRADIATION TESTING
(E. N. Harbinson)
5. 1. Time Required for Inpile Restructuring
(E. N. Harbinson, R. E. Womack)
The effects of heat rate and time on the restructuring character-
istics of sol-gel UO2-PuO2 spheres and of angular particles and pellets
prepared from coprecipitated UO2-PuO2 powder are being evaluated.
Sixteen capsules containing three pins each-one vipac, one sphere-pac,
and one pellet--have been irradiated in the thermal flux of the BAWTR
for from 8 hours to 55 days at linear heat ratings of 6 to 20 kW/ft. The
irradiation history of these 16 capsules is described in BAW-3714-19.5
The post-irradiation examination of 27 fuel pins from nine pre-
viously disassembled capsules5 is progressing in B&W's hot cell facil-
ities. Table 5-1 describes these 27 pins and presents their irradiation
All of the pins have been punctured under vacuum to collect the
fission and sorbed gases released. The total quantity of gases present
and the internal void volume of the fuel pins were measured. The gas
composition is being determined by mass spectrometry, but the data
are not complete. A complete analysis of these data will be presented
in the next quarterly report.
Sixteen of the pins have been sectioned in the transverse direction,
and specimens have been obtained for metallographic examination.
These specimens have been mounted and ground, but they have not been
polished or etched. Photomicrographs of the as-ground cross sections
of sphere -pac and pellet pins operated at 6, 10, 15, and 20 kW/ft are
shown in Figures 5-1 through 5-8. Central voids are apparent in all
pins operated at 10, 15, and 20 kW/ft but not in those operated at 6
5-1 Babcock & Wilcox
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Carlson, R. V. Gel-Addition Process Chemical Studies: Quarterly Progress Report Number 18, November 1970 - January 1971, report, 1970-11/1971-01; Lynchburg, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc101108/m1/21/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.