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Unformatted text preview: 25. Let P0 be the initial power output, P be the ﬁnal power output, k be the multiplication factor, t be the
time for the power reduction, and tgen be the neutron generation time. Then, according to the result of
P = P0 k t/tgen .
We divide by P0 , take the natural logarithm of both sides of the equation and solve for ln k :
ln k = tgen
1.3 × 10−3 s
= −0.0006161 .
1200 MW Hence, k = e−0.0006161 = 0.99938. ...
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