A Pu-239 fueled reactor is operating at a steady state power of 3000MWth. (see table 7.2 and example 7.6) a) The reactor is scrammed by inserting 15.0% negative reactivity via control rods. What is the reactor power immediately after the scram?

b) What is the power 10 minutes after the scram?

c) What do these calculations not account for, in terms of power?

= Ae + Ae e one delayed-group model and by a sum of seven exponentials in the more stic case of six delayed groups = Ae + Ae + ... + Aret. TABLE 7.2 DELAYED NEUTRON FRACTIONS Nuclide B (thermal neutron fission) 232Th 233 U 235U 238U 239 Pu *Fission induced by prompt neutron spectrum. 0.0026 0.0065 B (fast fission*) 0.0021 0.0203 0.0026 0.0064 0.0148 0.0020