7. A heterogeneous uranium-water lattice consists of a
square array of natural uranium rods 1.50 cm in
diameter with a pitch of 2.80 cm. Calculate the: (a) radius of the
equivalent cell; (b) uranium-water volume ratio
VF/VM; (c) thermal utilization; (d) resonance escape probability;
(e) fast fission factor (from Fig. 6.10); (f) k
Given that
a=d/2= 0.75 cm
a) radius of equivalent cell is given as
b) the uranium-water volume ratio is calculated as
c)
thermal utilization is
hence,
At 20 C,
we have
thus,
d)
e)
f)
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