Molten-Salt Reactor Program Semiannual Progress Report, January 31, 1964 Page: 76
xvi, 166 p. : ill. ; 28 cm.View a full description of this report.
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76
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WLUNCLASSIFIED
ORNL-DWG 64-3946
o EGCR-TYPE AGOT (LOT 1074) PARALLEL TO EXTRUSION AXIS
SEGCR-TYPE AGOT (LOT 1074) PERPENDICULAR TO EXTRUSION AXIS
0 CGB PARALLEL TO EXTRUSION AXIS100
200
300 400 500 600 700
800
TEMPERATURE (C)
Fig. 4.11. Effect of Irradiation on Young's Modulus of
Graphite.
Manufacture of MSRE Control Rod Elements
A total of 160 MSRE control rod elements were manufactured by Westing-
house Atomic Fuel Department. The elements are gadolinium oxide - aluminum
oxide bushings clad with Inconel, as shown in Fig. 4.12. They are about
1-1/2 in. long with an ID slightly larger than 3/4 in. and a wall thick-
ness of about 3/8 in. Each element contains three 70% gadolinium oxide -
20% aluminum oxide bushings made by pressing and sintering prereacted
powder. The use of prereacted powder was developed at ORNL8 to minimize
shrinkage during sintering due to a reaction between A1203 and Gd203.
Prototype bushings were made by pressing and sintering without prereacting;
but dimensional control required subsequent grinding, and the bushings were
found to react with water. Therefore, the production elements were made
using prereacted powders.
The manufacturing process for the bushing consisted in mixing the
A1203 and Gd203 powder and prereacting at 1700F. The reaction products
were crushed, ball milled, sized, pressed into a bushing, and sintered at
1450F. Each bushing was then given a thermal shock test by heating to
1400F and quenching in water. After grinding, the bushings were visually0 0
0
08 o
8
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Oak Ridge National Laboratory. Molten-Salt Reactor Program Semiannual Progress Report, January 31, 1964, report, July 1964; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc100344/m1/94/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.