PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I Page: 26 of 161
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4. Water-Cooler Control
The objective of the water-cooler control system is to
provide smooth continuous control of (a) the temperature difference be-
tween the reactor steam and the water entering the reactor from the forced
circulation loop, and, independently, (b) the total flow of water in the forced
circulation loop. A possible method of accomplishing this is described in
order to provide some indication of system complexity. The Architect-
Engineer is expected to review this and other possible methods in detail,
consulting instrument manufacturers where necessary, and to propose in
detail the final system to be employed.
Any required preset temperature differential (up to 150F)
across the heat exchanger tube wall must be maintained, regardless of rate
of flow through the units. This differential is maintained by a variable
range-ratio controller which controls the back-pressure regulator in the
secondary coolant steam-release outlet line. Pressure-sensing connections
are installed in the inlet line of each water cooler and in the secondary
coolant outlet ahead of the back-pressure regulator valve. In addition, the
forced-circulation system is equipped with a venturi tube to sense total
forced-circulation flow, several temperature-sensing elements to meas-
ure final mixed reactor inlet water temperature, and a number of by-pass
lines containing flow venturis and flow-control valves.
All the water-cooler units are connected in parallel for con-
current operation; Each of the water coolera is equipped with temperature-
sensing elements in the inlet and outlet lines connected so as to measure
differential temperature across the unit, and a flow-measuring venturi and
flow-control valve in the effluent line. A small valve in parallel with the
flow-control valve permits a small flow of system water through the cooler
to maintain temperature while the cooler is in stand-by condition.
Readings from flow venturis WF in the individual cooler
effluent lines may be read on a multi-selector flow indicator in the control
room as a check on the position adjustment of the flow-control valves.
The total forced-circulation water flow is controlled to the
desired value by a series of water by-pass flow-control valves (W6), ad-
justed by a flow controller which reads total water flow, as sensed by the
total forced-circulation venturi tube WF4, and compares the readings with
a set point. This set point, in turn, may be adjusted by other system vari-
ables (see Section G-7). The method for adjusting the by-pass valves (W6)
must provide a flow control as linear as possible and must be such as to
avoid surges as valves are brought on and off the line. Flow venturis WF3
measure the flow in the individual by-pass lines.
Provision is made so that any or all of the cooler controls
and valves may be operated manually whenever desired.
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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. (https://digital.library.unt.edu/ark:/67531/metadc1023272/m1/26/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.