SBWR Model for Steady-State and Transient Analysis

Table 5

Reactivity correlations.

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Reactivity (pcm)

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Void fractions reactivity

𝜌_𝑣(⟨𝜀_𝑔⟩)=−4.0925−41.036⟨𝜀_𝑔⟩+30.8223⟨𝜀_𝑔⟩².

Doppler effect

𝜌_𝐷=1.3−0.005⟨𝑇_𝑓⟩+2.0×10⁻⁶⟨𝑇_𝑓⟩²+−3.0×10⁻¹¹⟨𝑇_𝑓⟩³−1.1×10⁻³⟨𝜀_𝑔⟩(⟨𝑇_𝑓⟩−325.0).

Moderator temperature reactivity

𝜌_𝑚=1.656−1.035×10⁻²⟨𝑇_𝑚⟩+4.0×10⁻⁵⟨𝑇_𝑚⟩²−7.33×10⁻⁸⟨𝑇_𝑚3⟩.

Control rod drive reactivity

𝜌_cr=−11.235+57.73(1−CRD)1+0.937(1−CRD).

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