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2. The effect of temperature feedback on the time response of a reactor can be estimated by use of the program RTF (Reactor Transient with Feedback). RTF solves simple differential equations that express the rates of change with time of power and temperature. There is a negative temperature coefficient of reactivity, and power is extracted according to a temperature difference. a. Run the program RTF to see how the power, temperature, and reactivity vary with time for the sample problem using uranium. b. Examine the effect of changing the reactor fuel from uranium to plutonium. Pu has an effective neutron lifetime of only 0.04 s compared with the value for U of 0.083 s. Let all other factors be the same as in (a)