Table 7: Composition of TRISO particle [10].

LayerMaterialOuter radiusVol. Frac.Thermal conductivity
(μm)(%)(W m−1 K−1)

KernelUN35036.4Temperature dependent
BufferLow-density PyC40018.00.5
Inner PyCHigh-density PyC43515.64
SiC CoatingSiC47018.3Temperature dependent
Outer PyCHigh-density PyC49011.84