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ANP PROJECT PROGRESS REPORT
transfer calculations of Robinson and Weekesl’
were modified to apply to the presently planned
position for the loop in the LlTR by using certain
simplifying assumptions. The tip of the loop is
to be 1.5 in. below the center line of the reactor.
This is more than 4.5 in. below the position of
maximum flux. The flux measured near the fuel
tube in the previously operated loop” was taken
as the depressed flux for that loop. it was assumed
that the flux depression was the same for corre-
sponding parts of the present loop. The difference
in shape of the flux profile for the two loop po-
sitions was ignored in calculating the fuel tube
wal I temperature differential. Fi s sion-product
poison contributions to the macroscopic cross
section of the fuel were assumed to be negligible.
12M. T. Robinson and D. W. Weekes, Design Calcu-
lations for a Miniature Higb-Temperature In-Pile Circu-
lating Fuel Loop, ORNL-1808 (Sept. 19, 1955).
3
-
3
0
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B
s
J
J
w
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3
c
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W
3
LL
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3
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LL
240
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The transmission coefficient for neutrons in the
fuel was determined from work reported by Holmes,13
and it was used in conjunction with the flux distri-
bution along the loop, as shown in Fig. 4.2.12,
to determine the total loop power.
Finally, to find the temperature differential
through the lnconel fuel tube wall, the curves of
heat transfer variations along the loop designated
Mark Vlll in the work of Robinson and Weekesl’
were modified for the higher total power of the
loop being investigated. A plot of the calculated
temperature differential through the tube wal I vs
the position on the loop for proposed operating
conditions is presented in Fig. 4.2.13. The maxi-
mum combined temperature corrections for all three
errors totaled 3sOC.
13D. K. Holmes, Problems of Neutron Population in
Localized Absorbers, ORNL CF-56-1-141 (Jan. 27,
1956).
50 00 4 50 200
DISTANCE ALONG LOOP FROM INLET TO COOLED SECTION (cm)
W
uwwmwub
ORNL-LR-DWG 14747 .
Fig. 42.12. Calculated Profile of Flux at Fuel Tube Surface Along the LlTR Vertical In-Pile Loop. .
2 50
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