Table 1: Control rod and boron worth, their limits, and the calculated values for the Th-MOX and the reference UOX core. For the Th-MOX core, the boron used for reactivity control is enriched to 60% in 10B instead of the usual 19.8% (natural isotopic composition), and stronger control rods are used.

Parameter Limit UOX-ref Th-MOX

Min boron worth [pcm/ppm] −15 −8.3 −8.7
Max boron worth [pcm/ppm] −5 −6.2 −5.2
Min SDM [pcm] 2000 2559 3895
Max rod worth [pcm] 6505 7808