flows, a parallel orificing and valving arrangement is contemplated. A
significant feature of the steam circuit is that it is basically a two-pressure
system. In order to minimize the influence of possible variations of con-
denser pressure upon the reactor, the steam is throttled so that the down-
stream pressure is approximately 50% of upstream pressure. Heat
dissipation control of the condensers is primarily the same as that described
for the forced-circulation water coolers. A "blind dutchman" by-pass across
the throttling valves is provided if operation of the condenser at full system
pressure is desired. The valved by-pass line going to the de-aerating-hotwell
is used to supply the necessary steam for hotwell pressure control.
Condensate from the condensers goes to the de-aerating-
hotwell, from which it is pumped back into the reactor vessel and mixed with
the saturated water in the core discharge downcomer. This condensate is the
source of subcooling for the forced circulation pumps.
4. Forced-Circulation Pumps
These pumps provide the driving head for forced-circulation
operation. Both conventional shaft-sealed and totally enclosed pumps will be
considered. In any case, electric motor drives will be used. Final selection
will be based upon the leakage requirements of the system.
A final decision as to the number of pumps used has not as yet
been made. This decision will depend upon the interrelationship of cost, lay-
out, and flexibility of operation and control.
Figures 4, 7, and 8 show a tentative arrangement with the
pumping duty equally divided among four pumps.
5. Reactor Feed-Water Pumps
The feed-water pump is used to return the condensate mix-
ture from the de-aerating-hotwell tank to the reactor. As in the case of the
forced-circulation pumps, conventional-type shaft sealing may be considered.
An electric motor drive is to be used for this pumping also. Figures 4, 7,
and 8 show the location of this pump. Two pumps may be used if the desired
flexibility cannot be attained with one unit.
6. De-aerating-Hotwell
The de-aerating-hotwell receives the condensate discharge
of the primary steam condensers and is located as shown in Figs. 6 and 8.
The hotwell is heated and the temperature and pressure controlled by the
condenser by-pass which discharges to the hotwell through a distributing
header within the tank. The water level in the tank is maintained by the
primary water make-up system which, discharges to the hotwell.

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Fromm, L.W.; Bernsen, S.A.; Bullinger, C.F. & Matousek, J.F. PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I, report, July 15, 1957; Lemont, Illinois. ( accessed April 18, 2019), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.

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