Plant Dynamics Without a Control System

It is necessary to analyze the responses of the plant against stepwise perturbations in the components used for plant control. In BWRs, these components are the control rods, the recirculation pumps, the feedwater pumps and the turbine control valves. 

Average water density [g/cm ] Fig. 4.7 Density coefficient used for plant transient analysis 

Since the Super LWR is a plant with a direct-steam cycle like BWRs, those components are selected by referring to BWRs. The control rods, the feedwater pumps and the turbine control valves are to be used for plant control of the Super LWR. It is noted that the Super LWR has no recirculation pumps. 

Increase in the reactivity by 0.1 resulting from withdrawal of a control rod cluster. 

Decrease in the main steam flow rate by 5% resulting from closure of the turbine control valves. 

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