ORNL-2106 - the Molten Salt Energy Technologies Web Site

ANP PROJECT PROGRESS REPORT
DEVELOPED COOLING TUBE
SYMMETRY SURFACE ---)c
,ZERO HEAT TRANSFER SURFAC
UPPER SURFACE INSULATED SURFACE
Fig. 1.1.8. Temperature Profile in Sodium Expansion Tank Roof.
PERFORMANCE REQUlREMENTSfOR PUMPS
IN THE NaK SYSTEMS
M. M. Yarosh
A study was completed to determine the speed
and power range requirements for the main and
auxiliary NaK pump motors. Because of unequal
system lengths, the pressure drops in each of the
four main NaK systems for an equal NaK flow are
different, and thus a different pump speed is re-
quired for each system. In addition to the vari-
ations between systems, the individual system
resistances will vary as a function of operating
time and operating conditions. These variations
will be attributable to the mass-transfer buildup
anticipated in the colder sections of the NaK
systems, principally in the radiator tubes.
Pump speed requirements were established from
the pump performance curves. The NaK system
curves (head vs flow) showing expected ranges
of system resistance as a function of flow were
plotted on the pump performance curves, and the
operating speeds were established at design flow
to be those speeds falling between the minimum
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ORNL-LR-OWG 14950
UNDERSURFACEOFROOF
rcSYMMETRY SURFACE
and maximum system resistance curves. Thus,
a range of operating speeds was established for
each individual NaK system. Power requirements
were then computed for the corresponding speed,
head, and flow requirements.
In order to reduce warmup time for the NaK
systems, it will be desirable to operate the NaK
pumps at, or near, full speed during the warmup
period. Stress considerations, however, will pro-
hibit operation at full NaK pump speed forextended
periods of time when there is no fuel in the reactor.
Therefore an intermediate pump speed was estab-
lished at which reduced warmup periods can be
attained at reduced stress. The operating speeds
established and corresponding power requirements
for the main and auxiliary NaK pumps are given
in Table 1.1.1.
CONTROL-ROD COOLING SYSTEM
J. Foster
The ART control rod is designed to move verti-
cally in a well containing static sodium, this
sodium being deep enough to cover the control
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