Nothing is going to respond fast “enough” to collapsed win.
Natural Gas does. It can ramp up incredibly quickly.
The molten salt reactor built and tested at the Oak Ridge, Tn. facility in the 1960’s was sole purpose an aircraft turbojet heat source for heavy military aircraft. At standby the reactor is stably held at operating temperature, self regulating on that point, and any tapping into the salts heat store that reduces the temperature inherently raises the reaction rate.
The MSR is perfectly able to “load follow”, an absolute requirement in response to a pilots control input. However, typical response in a large power generating gas turbine is a ramp from 40% load (turn down) to full power over several minutes, the ramp as required to maintain low emissions.