Preliminary Design Report for the NMSR Pressurized Water Loop at ORR Page: 14 of 44
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Thermocouples are to be located at all points where it is considered
necessary to monitor or record temperatures. The one thermocouple, that
reads the highest temperature of the in-pile tube is to be connected to
a single point temperature recorder so as to have a continuous record of
the in-pile tube tmeperature. The recorder will have a scram switch which
is set at a suitable value above the operating temperature so that should
the in-pile pressure tube temperature rise to a dangerous value, a reactor
scram will be initiated.
C. Flow Control and Measurement
Circulation of water must be maintained in the loop at all times to
cool the test elements and in-pile tube. In order to maintain the re-
quired flow with an adequate measure of safety three pumps are to be
provided. The pumps are to be in parallel with one operating and the
other two as standby. The flow is to be controlled by a hand operated
flow control valve and measured with a venturi -and flow recorder.
Duplicate DP cells for measuring the flow will be required for safety
considerations. Two pressure switches are to be operated from each of
the flow signals emitted by the DP cells. One pressure switch is to
produce an alarm and turn on the first standby pump at low flow condi-
tions and the other to produce a reactor .scram at a very low flow condition.
When the loop is operating on reactor cooling water, the flow will be
measured by another orifice plate or venturi and DP cells. For safety con-
siderations the system of reactor cooling water flow measurement, signal
transmission, recording, and pressure switch for scram circuit is similar
to that of the main water flow system except for the pressure rating of the
DP cells. Two reactor cooling water pumps will be installed in parallel.
One pump to -serve as standby.
The cooling water flow to the system water pumps and the ion exchanger
system flow rate, are to measured by rotameters.
D. Electrical System
The main pumps are to be connected to a battery driven motor generator
set and the reactor emergency power system to insure against interruption
or loss of electrical power. The battery driven motor generator set is
necessary to supply power during the period of time required to put the
reactor emergency power system into operation. The 240V battery system
will be located over the operating area and the M.G. set will be located
directly behind the instrument panel.
Line heaters will be connected to the reactor emergency power. A brief
interruption of heater power is not considered serious. Surge tank heaters
to be connected to battery emergency power.
E. Surge Tank Liquid Level
The surge tank liquid level is to be indicated and recorded on a DP cell
recorder. The signal to the recorder is to be transmitted by two
tubing runs from the surge tank. The signal to the high side of the
instrument will come from a standpipe connected to the top of the surge012
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Dudley, I.T.; Trauger, D.B. & Savage, H.W. Preliminary Design Report for the NMSR Pressurized Water Loop at ORR, report, October 23, 1958; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc878967/m1/14/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.