PURPOSE: To enable an electromagnetic pump to be pulled out without cutting an outlet pipe and secure the soundness of structure by a method wherein a liquid metal discharging outlet is disposed at a position where a steam generator pipe connection part is opposed to a hanging casing side surface enclosing liquid metal discharged from an electromagnetic pump and breakage plates are disposed at both ends of an inner duct constituting the electromagnetic pump.

CONSTITUTION: Liquid metal discharged from an electromagnetic pump 15 enters an electromagnetic pump hanging caging 51, thereafter discharged out of a discharging port 53 disposed in a side surface and then discharged out of a liquid metal outlet pipe 13 connected to an electromagnetic pump supporting casing 50 at a central upper part of a steam generator 6. Liquid metal leakaged into a clearance between a casing 51 and a casing 50 descends in the clearance and returns to a suction port of the electromagnetic pump. Accordingly, the liquid metal outlet pipe 13 and the electromagnetic pump 15 have no connection part and thus they can be pulled out without cutting any pipe when the electromagnetic pump is pulled out. Breakage plates 36 mounted at both ends of an inner duct 35 of the electromagnetic pump are broken by pressure generated when a large-scaled breakage of a thermal transmitting pipe 20 and a pressure difference across the electromagnetic pump 15 is eliminated through the openings in the breakage plates, so that the breakage of them can be prevented.