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PERIOD ENDING JUNE 10, 1956
TABLE 3.1.2. URANIUM ANDiMPURlTY ANALYSES OF FUEL MIXTURE (No. 30) NaF-ZrF4-UF4
(50.46-4 mole 96) AFTER CIRCULATION IN INCONEL LOOPS 7425.41 AND 7425.43
Loop No. Sample Taken
Uranium Content
Impurities Found (ppm)
(wt X) Ni Cr Fe
7425-41 Before filling 8.61 40 1 05 45
7425-43 Before filling
'This value is in doubt.
After draining 10*3* 40 440 70
After draining
SODIUM AND NaK IN INCONEL
FORCE D-CIRC UL AT ION L OOPS
J. H. DeVan
R. S. Gouse
An lnconel forced-circulation loop completed
loo0 hr of operation with sodium which had been
specially treated to removed oxide contamination
prior to testing. During this test the maximum
fluid temperature was 1500°F, and the temper-
ature drop was 300°F. Prior to the actual test,
sodium was circulated through the loop at lSOO°F
under isothermal conditions to remove oxide films
from both the hot and cold legs of the loop. This
sodium was then dumped at 1500OF and replaced
with a charge that had been cold trapped and
filtered in a service loop operated at 300OF. A
circulatory cold trap maintained at 300°F was also
used during the test. An evaluation of mass
transfer in this loop showed that the weight of
deposit was equivalent to that fo
operated with normal sodium either w
circulated NaK and operated with a 30O0F cold,
trap temperature.
9.20
9.37
50 55 70
100 650 80
SOD IU M-B E R Y L L IUM-I NCO N E L
COMPATIBILITY IN DYNAMIC SYSTEMS
J. H. DeVan R. S. Crouse
Previous compatibility studies of Inconel-
beryllium-sodium systems, conducted by inserting
small beryllium tubes in the hot legs of toroid,
thermal-convection, or forced-circulation loops,
showed little effect on temperature-gradient mass
transfer at temperatures up to 130OoF that could
be attributed to the presence of the beryllium. To
determine whether increasing the beryllium surface
area relative to the surface area of the lnconel
would affect the compatibility, two forced-circu-
lotion loops, in which equivalent surface areas of
beryllium and Inconel were in contact with the
flowing sodium, were operated at 125OoF. Only
one of the loops had an oxide cold trap.
The beryllium, in the form of rectangular blocks
with drilled holes, was canned in lnconel and
inserted in the hottest section of the loop; the
remaining sections of the loop were constructed of
Inconel. A temperature drop of 300°F was
maintained between the hot and cold fluid temper-
atures in each test. After 1000 hr of operation,
no increase in-the amount of mass transfer was
seen in either of these loops as compared with the
mass transfer found in similar loops with smaller
beryllium inserts. The mass-transferred deposits
found were not sufficient in quantity to permit
chemical analysis. They were similar in amount
and appearance to deposits seen in Inconel loops
without beryllium inserts. The addition of the
cold trap had little effect on the test results.
3J. H. Devon, E. A. Kovacevich, and R. S. Crouse,
ANP Quar. Prog. Rep. March IO, 1956, OWL-2061,
P 117.
135