STUDY OF FUEL TEMPERATURE AND FLOW EFFECTS OF PLUGGING IN SRE FUEL CHANNELS Page: 22 of 34
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4952
NO
ATOMICS INTERNATIONAL
A Division of North American Aviation, Inc.DATE March 15, 1960
PAGE 21 OF 33obtained from Ref. 1. A .296" diameter orifice will do the job and
the resulting pressure drops will be split to 0.5 psi through the
element and 1.0 psi through the orifice. If these reference
conditions are plugged into equation 19, the following flows and delta
t's are calculated:Flow
Reduction
w/wTDelta t Increase
A T/ 6 Tr0.987
0.942
0.833
0.972
0.900
0.747
0.955
0.856
0.684
0.915
0.781
0.578Outer Channel
1.01
1.06
1.20
1.03
1.11
1.34
1.05
1.17
1.46
1.09
1.28
1.73Avg. Channel
1.02
1.08
1.25
1.05
1.17
1.45
1.08
1.25
1.65
1.15
1.43
2.02When these results are plotted on Figure 5 (dashed lines) and
compared to the previous results it is seen that these lines cross
the d t/ A tr - 1.10 line at an average of about 7% higher CC than
the corresponding lines for the average fuel elements. Then, on the
average for detection by the 10% rule, the flow area of outer fuel
channels must be blocked about 7% more than the flow area of the
average channels.
The power in the outer fuel channels is 87% of the power in the
average fuel channel (Ref. 3). Referring to Figure 6, the average
fuel surface area insulation required to produce a hot spot tempera-
ture of 1400*F is increased from 32% to 39% when power is reduced
to 87%. This results in an increase in the average size of the
dangerous plugs which roughly corresponds to the plug size increase
required to make plugs in this region of the core as detectable
as those in average channels. Thus, effects 1 and 2 cancel and
conclusions reached regarding the average channel can be safely
generalized to the core as a whole.
730-V-45 (REV 5-59)Plugged
Area
ocPlug
Length
LPL0.1
0.30.5
1.0
0.2
0.4
0.6
0.2
0.4
0.6
0.2
0.4
0.6
0.2
0.4
0.6
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Noyes, R.C. STUDY OF FUEL TEMPERATURE AND FLOW EFFECTS OF PLUGGING IN SRE FUEL CHANNELS, report, March 15, 1960; Canoga Park, California. (https://digital.library.unt.edu/ark:/67531/metadc868757/m1/22/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.