Plant Startup and Stability

In this chapter, the startup and stability of the Super LWR plant are described. Since the plant system of the Super LWR differs from those of LWRs, the startup scheme that is suitable for the Super LWR plant needs to be proposed. The reason why the plant startup and stability are described in the same chapter is that the stability is one of the design limitations for the startup procedure. 

In Sect. 5.2, two startup schemes for the Super LWR plant are proposed referring to those of fossil-fuel fired power plants (FPPs). The required sizes and weights of the equipment for these startup schemes are calculated. 

In Sect. 5.3, the operating region of the reactor power and feedwater flow rate for satisfying the thermal criteria is identified with thermal analyses. It includes both supercritical and subcritical pressure conditions. Based on the results, the startup curves are designed. 

Although the coolant flow in the Super LWR is single-phase, the coolant enthalpy and therefore the density change substantially in the core because the coolant flow rate per thermal power in the Super LWR core is less than one eighth of LWR cores. Thus, the Super LWR can be susceptible to flow oscillations as the BWRs are. In Sect. 5.4, thermal hydraulic stability of the Super LWR is analyzed with the frequency domain approach. The analysis includes both supercritical and subcritical pressure conditions. 

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Plant Startup and Stability Main steam Turbinccontrol... 

In this chapter, the plant startup and stability were introduced. Both constant pressure and sliding pressure startup schemes are designed by referring to FPPs. The constant pressure startup system requires a startup bypass system consisting of a flash tank and pressure-reducing valves. The sliding pressure startup scheme... 

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