Doppler Coefficient of Reactivity

Such fuel being loaded to the CHTR core, the required power of 100 kW(th) can be generated during 15 effective full power years of continuous operation. In this, the Doppler coefficient of reactivity was found satisfactorily negative. The values for this fuel design, as well as for a case with no poison added to the fuel, as a function of burn-up, are shown in Fig. XXIX-4. 

Nq = n(0) is the steady-state initial neutron density. The Doppler coefficient of reactivity and the density coefficient of reactivity are considered for the reactivity feedback. The reactivity distribution in the axial direction is assumed to follow the square of the cosine distribution. 

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