Exercise $3.[20$ pts$]$

Use the PRKE data with $6$ groups from HW$-5($Use Pu$-239$ data$).$ Solve the PRKE $6-$group

equations for a ramp insertion of a total reactivity worth of $-0\mathrm{.}75$$$.$ The ramp insertion lasts $1e-5$

$s$; after that, the reactivity is constant and equal to $-0\mathrm{.}75$$$.$ The transient duration is $3$ seconds.

$[4$ pts$]$ Use scipy's solve$\_$ivp with the Radau method and absolute and relative tolerances

of ${10}^{-5}.$

pts