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L
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PERIOD ENDING DECEMBER 70, 7954
where R, is the island radius, R, s the outer and this curve is also shown in Fig. 2.3. The
radius of the fuel region, and 7is the thermal age. "
thermal absorption rate" plotted is CI direct
Evidently the absorption rate depends only on two measure of the neutron leakage - the higher this
parameters: R,/R and 7/R:. rate the lower the leakage.
For the source located at R,, the result is
2
A =-
2 T 7
For a uniform source throughout the fuel region, the Eesult is
(3)
Equations 1, 2, and 3 were evaluated by numerical
t integration for R2/Rl = 1.67 and 7/R: = 0.33,
0.44, and 0.55. The plots are shown in Fig. 2.3.
For the case R, = 0, Eq. 1 reduces to
c
-
-T/Rf 71 /2
e erfc - ,
R2
ertrrn
ORNL-LR-DWG 4499
0.222 0 222 0.333 0.444 0.555 0.666
0.9 I , , I I I I I I
(; /]
2
[l + - 1) x cot
PROPOSED ART INSTALLATIONS
A. P. Fraas F. R. McQuilkin
Aircraft Reactor Eng i neer i ng Div i s ion
A study has been made of the various types of
facilities suitable for the operation of the Aircraft
Reactor Test. In addition to the obvious require-
ments for shielding, heat dumps, and auxiliary
equipment, it is essential from the hazards stand-
point that provision be made to contlclin the
products resulting from a nuclear accideni and/or
chemical reaction of all combustibles in the
installation, minimize the likelihood of serious
damage from an explosion caused by sabotage or
bombing, and remove and dispose of volatile
fission products evolved during the course of
operation. With these criteria in mind, CI series
of four basic reactor installations was considered;
each differed in some fundamental characieristics
from the others. The four installations are as
follows: (1) an open test unit mounted over a
water-cooled pan at the National Reactor Testing
Station (NRTS), (2) a circular Quonset type of
hemispherical building, (3) a water-walled tank,
and (4) a reactor submerged in a pool of water.
Fig. 2.3. Thermal Absorption Rate in Mathe- ators, blowers, a control system, and a .FiIl-and- Fill-andmatical
Model of Reflector-Moderated Reactors. drain system. These components would operate
..
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