u00b0 c electrical strike and creep distances for air operation is maintained by the ceramic insulator 50 and first and second glass preforms 52 56 configuration should further motor cooling be desirable the pump 30 may be provided with cooling tubes 92 as illustrated in fig6 the cooling tubes 92 act as a heat exchanger to transfer heat from the stator 42 to the reactor coolant the cooling tubes 92 are disposed within the end cap 40 of the downstream end of the pump 30 run through the housing 34 through the u201c back iron u201d area of the stator 42 and through the end cap 38 at the upstream end of the pump 30 the reactor coolant enters the cooling tubes 92 at the downstream end of the pump 30 where the reactor coolant is at a higher pressure than at the upstream end of the pump 30 the pressure difference is enough to drive the reactor coolant through the cooling tubes 92 preferably the cooling tubes 92 are made from stainless steel inconel or other non magnetic alloy the reactor coolant flows through the cooling tubes 92 and absorbs heat from the stator 42 which will typically be operating at a higher temperature than the reactor coolant if a higher cooling capacity is required cooling tubes may be installed in the stator slots externally supplied cooling water from outside reactor vessel 12 may.