Patent Number: 054694809
Section: claims

1. A mid-loop operating method carried out during nuclear refueling, characterized in that a round-about pipe conduit is additionally installed between a suction pipe conduit and a discharge pipe conduit of a residual heat removing pump; and a flow rate adjusting valve is installed on said round-about pipe conduit, so that the flow passing through said pump can be maintained at a predetermined normal operation flow level during a mid-loop operation, and round-about flow rate is gradually increased in accordance with the decrease of a residual heat of an atomic reactor, whereby a suction flow rate is maintained at a predetermined level, and introduction of air into the residual heat removing pump is prevented.  the facility comprising:  a round-about pipe conduit 4 installed between a suction pipe conduit 2 and a discharge pipe conduit 3 of a residual heat removing pump 1; and  a flow rate adjusting valve 5 installed on said round-about pipe conduit 4. 2. A mid-loop operating facility for nuclear power plants carried out during nuclear refueling,