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0 20 40 60 80 lo0 I20 440 (60 180 200 220
DISTANCE ALONG LOOP FROM INLET TO COOLED SECTION (cm 1
Fig. 4.2.13. Plot of Glculated Temperature
Differential Through the Fuel Tube Wall as a
Function of the Distance from the Fuel Inlet of
LITR Vertical In-Pile Loop.
FURTHER DESIGN CALCULATIONS FOR
LITR VERTICAL IN-PILE LOOP
M. T, Robinson
ark Vlll loop described
"4 T. Robinson, Solid State Semiann. Prog. Rep.
Feb. 28, 1954, ORNL-1677, p 27.
PERIOD ENDING JUNE 10. 1956
flection of the measured flux in the plane of its
maximum value. The computations were carried
out on the Reactor Controls Computer according
to the technique previously described,'* except
that the flux function was generated electronically
instead of mechanically.
Calculations were made for the fuel mixture
(No. 44) NaF-ZrF4-UF, (53.5-40-6.5 mole %) con-
tained in Inconel in the new position and for the
fuel mixture (No. 107) NaF-KF-LiF-UF4 (11.2-
41-45.3-2.5 mole %) contained in Hastelloy B in
both positions. The Fhysical property data used
for air, for Inconel, and for the zirconium-bearing
fuel mixture were the same as those used previ-
ously. The data for the alkali-metal fuel and
Hasteltoy B are given below:
Density of fuel,17 g/cm3 2.09
Specific heat of w*~ec/g*~C 2.28
Viscosity of fuel,19 g/crn-sec 0.022
Thermal conductivity of fuel, 20
w/cm*OC
0.035
Thermal conductivity of Hastelloy BI2' 0.1 13
w/cm*OC
As before, the depression of the thermal-neutron
flux because of the presence of the loop was
neglected.
The results of the calculations are summarized
in Table 4.2.1. It is shown that, in spite of the
greater length of the irradiated loop in the "deep"
position, the fuel temperature differential is less
than that in the position of maximum flux. The
principal result of the change in position of the
loop is a substantial decrease in the dilution
16E. R. Mann, F. P. Green and R. S. Stone, "An
Appendix on Analog Simulation," in Design Calculations
for a Miniature Higb-Temperature In-Pile Circulating
Fuel Loop, by M. T. Robinson and D. F. Weekeg,
OWL-1808 (Sept. 19, 1955).
stimated by method of S. 1. Cohen and T. N.
, A Summary of Density Measurements on Molten
Fluoride Mixtures and a Correlation Useful for Predicting
Densities of Fluoride Mixtures 01 Known
Compositions, ORNL-1702 (May 14, 1954).
18Estimated on assumption that the alkali-metal fuel
s the same molar heat capacity as that of the zirconium-bearing
fuel.
19S. 1. Cohen, personal communications to M. T.
Robinson, March 16, 1956, and May 4, 1956.
"Estimated by W. D. Powers, March 16, 1956.
21 Haynes Stellite Company, Hastelloy Highstrength,
Nickel-Base, Corrosion-Resistant Alloys, p 15, Sept. 1,
1951.
241