Effect of Zirconium Hydride Layer on Void Reactivity

1 Effect of Zirconium Hydride Layer on Void Reactivity 

Homogeneous cores (in the seed fuel region) of the Super FR and a LMFBR were adopted to study the effect of a ZrHj 7 layer [12]. The calculation models of the cores are shown in Fig.7.3. Both cores are high enough that the transverse leakage 

The changes of the void reactivity as a function of the seed fuel region radius and ZrHi.7 thickness are shown in Fig. 7.4. In the case of the Super FR, using a 1-cm thick ZrHi.7 layer has an equivalent effect to decreasing the radius of the seed fuel region by 35%. When the layer thickness is above 2 cm, the effect is saturated. 

Seed Radial Blanket Whole Core with Layer - without Layer 

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