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where
Ci = relative delayed-neutron precursor concentration,
t = time,
B = reactor power,
B = delayed-neutron fraction,
k = muPtipLieation factor,
37
h = prompt-neutron generation time,
xi = aeiayea-neutPon prec~rsor decay constant,
ai = delayed-neutron fractional yield,
R = coolant flow constant,
T = mean salt transit time in external loop.
These equations then show that, where dollars of reactivity are defined
as $i = (k - l)/kB, the steady balance condition requires a nonzero value
of $ e Thus,
'Ai'
where E5 is equal to 1 - e . Defining a new effective reactivity as
we can write the inhour equation relating asymptotic inverse period w to
A, the amount of reactivity in excess of that required to maintain steady
state under the given flow rate.
where Fi is equal t o 1 - e~p[--CAi 9 U)T].
The prompt-neutron generation
time was calculated by the boron-poison method to be 362 ps. For now,
we will ignore the difference between B and Beff, which is expected to
be small fn Bow-leakage systems. Table 22 was compiled using standard