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ANP PROJECT QUARTERLY PROGRESS REPORT
Fig. 11. 11. Inconel Specimen in Hot
(800'C) Leg of Quartz Loop after Circu-
lating Lead for 125 Hours. 90X.
corrosion in the cold leg of the first
loop (at 4OO0C) and only very slight
corrosion in the cold leg of the
second loop (at 47SoC), led to the
conclusion that the corrosive attack
of liquid lead on Inconel probably
began in the neighborhood of 500°c.
The chemical analysis of the plugs
forroed in the quartz loop tests was
only slightly different from the
nominal composition of Inconel. It
was therefore concluded that the
liquid lead had virtually no selective
leaching action on the Inconel speci-
mens. It was further concluded that
both severe mass trans fer and corrosive
attack will occur in lead-Inconel
thermal convection loops with hot leg
temperatures of 800°C, even when the
lead has been carefully deoxidized
with hydrogen.
Compatibility of Be0 in NaK.(8)
Dynamic tests of Be0 in NaK are being
.I
(*)The chemical analysis of NaM for beryllium is
reported in section 15. "Analytical Studies of
ne ac t o r Mat e r i a1 s ."
150
*.
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.., .
._ .. .. 9"s. . . ._ ,..
* .
, . ..
r. . , . e: . ~ . -.
e .
.. :.
-:
. -
. -?
. .
11'1g. 11.18, Inconel Specimen in Cold
(40O'C) Legof Quartz Loop After Circu-
lating Lead for 125 Hours. 90X.
conducted by the Experimental Engi-
neering Department. Blocks of Be0
approximately 0.25 by 0.25 by 0.50 in.
were weighed and measured as received
from the shop, heated to a bright red
color , reweighed and remeasured, and
then placed in a test assembly con-
taining eutectic NaK heated to 1400OF.
The Be0 was fastened to the end of a
rotating shaft and rotated at a linear
velocity of 0.15 ft/sec. In the tests
to date, there has been considerable
Re0 weight loss upon exposure for 100
hr or longer at 1400°F. The test
results are summarized in Table 11.12.
Since earlier static tests showed
no instability of the BeO, additional
static and dynamic tests are being
carried out, along with an investi-
gation of cleaning, drying, and similar
techniques for obtaining accurate
weighing of the Be0 before and after
exposure to NaK.
Sodium in Forced-Convectioo Loops.
Metallurgical analyses of the figure 8
'*