Patent Number: 052727335
Section: claims

1. A control rod driving hydraulic system of a control rod driving system of a nuclear power plant, in utilization of condensate fed from a condensate supply source of the nuclear power plant as a control rod driving water, comprising a water pressure control unit arranged for each control rod and a water pressure supply unit for commonly supplying water pressure to all control rods, said water pressure supply unit comprising: a pump means operably connected to the condensate supply source for driving the control rod driving water;  means for regulating quantity of flow of the control rod driving water;  means for regulating pressure of the control rod driving water; and  a filter means operably connected to the condensate supply source and said pump means for filtering the condensate as the control rod driving water, said filter means including at least one hollow fiber filter unit for purifying the control rod driving water and said filter means includes a suction filter unit and a driving water filter unit, said suction filter unit being connected to the condesnate supply unit at one end, said driving water filter unit is connected at one end to another end of the suction filter unit through the pump means and connected to the flow quantity regulator, said suction filter unit being substituted with the hollow fiber filter unit. 2. The control rod driving hydraulic system according to claim 1, wherein said hollow fiber filter unit includes a backwash regeneration equipment. 3. The control rod driving hydraulic system according to claim 1, wherein said hollow fiber filter unit includes a sealing casing having an interior divided into two sections by a partition plate provided with a plurality of perforations, a bundle of filament fiber elements passing through the perforations of the partition plate, a drain mechanism connected to the sealing casing and a backwash regeneration equipment connected to the sealing casing. 4. The control rod driving hydraulic system according to claim 3, wherein said backwash regeneration equipment includes an air supply unit for supplying air into the sealing casing, a purge air supply pipe connected to the air supply unit and to one section, as a header chamber, of the sealing casing and a bubble air supply pipe connected to the air supply unit and to another section, as a filtering chamber, of the sealing casing. 5. The control rod driving hydraulic system according to claim 1, wherein said suction filter unit includes two suction filters which are substituted with two hollow fiber filter units. 6. The control rod driving hydraulic system according to claim 1, wherein said suction filter unit includes two suction filters one of which is substituted with one hollow fiber filter unit. 7. The control rod driving hydraulic system according to claim 1, wherein said suction filter unit includes one suction filter which is substituted with the hollow fiber filter unit. 8. The control rod driving hydraulic system according to claim 1, wherein said suction filter unit is connected to the condensate supply unit at one end, said driving water filter unit is connected at one end to another end of the suction filter unit through said pump means and connected at another end to the flow quantity regulating means and wherein said driving water filter unit is substituted with the hollow fiber filter unit. 9. The control rod driving hydraulic system according to claim 1, wherein said driving water filter unit includes two driving water filters which are substituted with two hollow fiber filter units. 10. The control rod driving hydraulic system according to claim 1, wherein said driving water filter unit includes two driving water filters one of which is substituted with one hollow fiber filter units.