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ANP PROJECT PROGRESS REPORT
SECTION A-A
circuit^,^ and flow tests with water being pumped
by the two fuel pumps under simulated reactor flow
conditions are under way.
Twin fuel pump operation has been demonstrated
up to 3000 rpm, although 2400 rpm produced approxi-
mately rated conditions of head and flow. De-
gassing of the system with pump speeds of 2400
rpm required less than 30 sec with the water level
1 in. or more above the bottom of the surge chamber.
When the speeds of both pumps were lowered in
unison from 2400 rpm, the first signs of ingassing
3D. R. Ward, ANP Qwr. Prog. Rep. Dec. 10, 1955,
ORNL-2012, p 65, Fig. 2.29.
24
Fig. 1.1.6. Sodium Expansion Tank Design.
occurred at 1200 rpm. The amount of gas entrained
during operation with the pump speeds matched
was believed to have reached a maximum, not
exceeding 0.1 vol %, at 500 rpm. At speed levels
above 1200 rpm, ingassing could not be detected
with mismatching of up to 5%. Mismatching the
speeds by 20% produced ingassing estimated to
be 0.5 vol %. When the power to one of the hy-
draulically driven fuel pumps was cut off while
both pumps were running uniformly at 2400 rpm,
about 13 sec was required for the one pump to
stop. This one-pump-stopped condition created a.
ingassing of roughly 2 vol %.
6.i
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