Microscopic Investigation into the Irradiation Behavior of U3O8-Al Dispersion Fuel

1986 ◽  
Vol 72 (3) ◽  
pp. 338-344 ◽  
Author(s):  
Gerard L. Hofman ◽  
George L. Copeland ◽  
John E. Sanecki
Keyword(s):  
Microscopic Investigation ◽  
Dispersion Fuel ◽  
Irradiation Behavior

Irradiation behavior of low-enriched U6Fe-Ai dispersion fuel elements

1987 ◽  
Vol 150 (2) ◽  
pp. 238-243 ◽  
Author(s):  
G.L. Hofman ◽  
R.F. Domagala ◽  
G.L. Copeland
Keyword(s):  
Dispersion Fuel ◽  
Fuel Elements ◽  
Irradiation Behavior

Irradiation behavior of atomized U–10wt.% Mo alloy aluminum matrix dispersion fuel meat at low temperature

2002 ◽  
Vol 211 (2-3) ◽  
pp. 229-235 ◽  
Author(s):  
Ki-Hwan Kim ◽  
Jong-Man Park ◽  
Chang-Kyu Kim ◽  
Gerard L. Hofman ◽  
Mitch K. Meyer
Keyword(s):  
Low Temperature ◽  
Aluminum Matrix ◽  
Dispersion Fuel ◽  
Fuel Meat ◽  
Irradiation Behavior

The Development of UMo/Al Dispersion Fuel

2011 ◽  
Vol 335-336 ◽  
pp. 1285-1292 ◽  
Author(s):  
Xiao Liu ◽  
Da Zhi Qian ◽  
Tie Cheng Lu
Keyword(s):  
High Performance ◽  
Aluminum Matrix ◽  
Dispersion Fuel ◽  
Existing Problems ◽  
Irradiation Test ◽  
Fuel Fabrication ◽  
The Matrix ◽  
Further Development ◽  
Performance Research ◽  
Irradiation Behavior

UMo/Al dispersion fuel is one of the prospective materials as a high uranium density fuel for high performance research reactors due to its excellent stability during irradiation. In this paper, An overview is provided of current development activities of UMo/Al dispersion fuel at abroad and home, including: the development reasons, this fuel fabrication technology, and the irradiation test. A comprehensive summary is given on the irradiation test, the existing problems and the solution recently obtained by the different countries. Early irradiation experiments with uranium alloys showed promise of acceptable irradiation behavior if these alloys could be maintained in their cubic γ-U crystal structure. The further development of this fuel was delayed due to an unacceptable volume expansion caused by UMo/Al interaction layer (IL) formation and a subsequent gross pore formation at the interface between UMo particles and matrix Al when severe irradiation conditions are reached. In order to alleviate or eliminate the swelling of UMo/Al dispersion fuel,several potential remedies are available to correct the swelling problems. These range from relatively minor changes to the fuel and matrix chemistry, to replacement of the aluminum matrix with another material, or to eliminate the matrix altogether. All of these variations are currently being investigated in the world.

Irradiation behavior of U6Mn–Al dispersion fuel elements

2000 ◽  
Vol 278 (2-3) ◽  
pp. 358-363 ◽  
Author(s):  
M.K Meyer ◽  
T.C Wiencek ◽  
S.L Hayes ◽  
G.L Hofman
Keyword(s):  
Dispersion Fuel ◽  
Fuel Elements ◽  
Irradiation Behavior

Low-temperature irradiation behavior of uranium–molybdenum alloy dispersion fuel

2002 ◽  
Vol 304 (2-3) ◽  
pp. 221-236 ◽  
Author(s):  
M.K Meyer ◽  
G.L Hofman ◽  
S.L Hayes ◽  
C.R Clark ◽  
T.C Wiencek ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molybdenum Alloy ◽  
Dispersion Fuel ◽  
Temperature Irradiation ◽  
Irradiation Behavior

scholarly journals Irradiation behavior study of U–Mo/Al dispersion fuel with high energy Xe

2015 ◽  
Vol 464 ◽  
pp. 236-244 ◽  
Author(s):  
B. Ye ◽  
S. Bhattacharya ◽  
K. Mo ◽  
D. Yun ◽  
W. Mohamed ◽  
...  
Keyword(s):  
High Energy ◽  
Dispersion Fuel ◽  
Behavior Study ◽  
Irradiation Behavior

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

Light and electron microscopic investigation of adenohypophyses of germfree, food-restricted, and germfree-food restricted aging, male lobund-wistar rats

1988 ◽  
Vol 46 ◽  
pp. 352-353
Author(s):  
G. Ilse ◽  
K. Kovacs ◽  
N. Ryan ◽  
T. Sano ◽  
L. Stefaneanu ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
Aging Male ◽  
Sprague Dawley ◽  
Electron Microscopic ◽  
Sprague Dawley Rats ◽  
Old Rats ◽  
Ad Libitum ◽  
Microscopic Findings

Germfree state and food restriction have been shown to increase life span and delay tumor occurrence in rats. We report here the histologic, immunocytochemical and electron microscopic findings of adenohypophyses of aging, male Lobund-Wistar rats raised at Lobund Laboratories. In our previous study, the morphologic changes in the adenohypophyses of old rats have been extensively investigated by histology, immunocytochemistry and electron microscopy. Lactotroph adenomas were frequent in Long-Evans and Sprague-Dawley rats, whereas gonadotroph adenomas were frequent in Sprague-Dawley and Wistar rats.Male Lobund-Wistar rats were divided into four groups: 1) conventional, which were raised under normal non-germfree environment and received food ad libitum; 2) germfree-food ad libitum; 3) conventional environment-food restricted and 4) germfree-food restricted. The adenohypophyses were removed from 6-month-, 18-month- and 30-month-old rats. For light microscopy, adenohypophyses were fixed in formalin and embedded in paraffin.

An Electron Microscopic Study of the Acute Effects of Hypothalamic Releasing Factors on the Anterior Pituitary Gland

1968 ◽  
Vol 26 ◽  
pp. 232-233
Author(s):  
P.W. Coates ◽  
E.A. Ashby ◽  
L. Krulich ◽  
A. Dhariwal ◽  
S. McCann
Keyword(s):  
Anterior Pituitary ◽  
Microscopic Investigation ◽  
Uranyl Acetate ◽  
Electron Microscopic Investigation ◽  
Electron Microscopic ◽  
Tissue Samples ◽  
Thin Sections ◽  
Dense Membrane ◽  
Membrane Bound ◽  
Releasing Factors

The morphologic effects on somatotrophs of crude sheep hypothalamic extract prepared from stalk-median eminence were studied by electron microscopy in conjunction with concurrently run bioassays performed on the same tissue samples taken from young adult male Sherman rats.Groups were divided into uninjected controls and injected experimentals sacrificed at 5', 15', and 30' after injection. Half of each anterior pituitary was prepared for electron microscopic investigation, the other half for bioassay. Fixation using collidine buffered osmium tetroxide was followed by dehydration and embedment in Maraglas. Uranyl acetate and lead citrate were used as stains. Thin sections were examined in a Philips EM 200.Somatotrophs from uninjected controls appeared as described in the literature (Fig. 1). In addition to other components, these cells contained moderate numbers of spherical, electron-dense, membrane-bound granules approximately 350 millicrons in diameter.

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