Abstract: A magnetic jack type in-vessel control element drive mechanism includes: an upper coil assembly which includes a first sleeve configured to coaxially wrap a control element drive shaft, a first coil, and a first coil housing which is externally coupled to the first sleeve; a lower coil assembly which includes a second sleeve configured to coaxially wrap the control element drive shaft, a second coil, and a second coil housing which is externally coupled to the second sleeve, wherein the lower coil assembly is located under the upper coil assembly, a connecting member which connects the upper coil assembly and the lower coil assembly; a support tube which extends downward from the lower coil assembly; a motor assembly which is located between the control element drive shaft, and the first and second sleeves; and an anti-separation cap which prevents separation of the motor assembly.

Abstract: A sealing mechanism for a reactor vessel (RV) cable penetration tube improves the functional and structural integrity of a cable inserted in an RV through a penetration tube due to use of a precise thimble. The sealing mechanism includes a penetration tube configured to penetrate an RV from an outside to an inside thereof and having a penetration hole for communication with the inside of the RV, a cable configured to be inserted in the RV through the penetration hole of the penetration tube, and a thimble placed between the cable and the penetration tube, wherein a dimple groove portion is provided on the thimble in a direction from an outer surface of the penetration hole toward the cable.

Abstract: Provided is a device for transferring spent fuel between spent fuel storage pools. The device includes a transfer container extending in a direction, disposed in a vertical direction, and containing spent fuel therein; a guide frame configured to guide the transfer container while maintaining a vertical orientation of the transfer container; and a transfer unit configured to transfer the transfer container along the guide frame.

Abstract: An anti-seismic apparatus for control element drive mechanisms of a nuclear reactor includes: an anti-seismic support plate including a plurality of insertion holes in which the control element drive mechanisms are respectively inserted; and bushings inserted between outer surfaces of the control element drive mechanisms and inner surfaces of the insertion holes. The support plate includes an upper support plate comprising a plurality of first insertion holes, a lower support plate comprising a plurality of second insertion holes at positions corresponding to the first insertion holes, and a connection part connecting the upper support plate and the lower support plate. The connection part includes a support beam vertically extending from an end portion of the lower support plate, an inner flange extending inward from an upper end portion of the support beam, and an outer flange extending outward from the upper end portion of the support beam.

Abstract: A sealing mechanism for a reactor vessel (RV) cable penetration tube improves the functional and structural integrity of a cable inserted in an RV through a penetration tube due to use of a precise thimble. The sealing mechanism includes a penetration tube configured to penetrate an RV from an outside to an inside thereof and having a penetration hole for communication with the inside of the RV, a cable configured to be inserted in the RV through the penetration hole of the penetration tube, and a thimble placed between the cable and the penetration tube, wherein a dimple groove portion is provided on the thimble in a direction from an outer surface of the penetration hole toward the cable.

Abstract: A magnetic jack type control element drive mechanism for precision position control of a control element assembly, satisfies the following conditions: D1=D2=P+D5; D3=P×2; D4=D3×(N?½), (N is an arbitrary natural number), wherein D1 represents a lift gap of the upper motor assembly; D2 represents a lift gap of the lower motor assembly; D3 represents a space width between tips of adjacent teeth of the drive shaft; D4 represents a gap between an upper latch and a lower latch; P represents pitch that is a distance of ascent or descent of the drive shaft; and D5 represents a margin which is a separation space between the teeth and the upper latch or the lower latch when the upper latch or the lower latch is inserted into the teeth of the drive shaft.

Abstract: Provided is a device for transferring spent fuel between spent fuel storage pools. The device includes a transfer container extending in a direction, disposed in a vertical direction, and containing spent fuel therein; a guide frame configured to guide the transfer container while maintaining a vertical orientation of the transfer container; and a transfer unit configured to transfer the transfer container along the guide frame.

Abstract: Provided is an anti-seismic apparatus for control element drive mechanisms. The anti-seismic apparatus is provided for an anti-seismic design of the control element drive mechanisms of a nuclear reactor. The anti-seismic apparatus includes: an anti-seismic support plate including a plurality of insertion holes in which the control element drive mechanisms are respectively inserted; and bushings inserted between outer surfaces of the control element drive mechanisms and inner surfaces of the insertion holes.

Abstract: A magnetic jack type control element drive mechanism for precision position control of a control element assembly, satisfies the following conditions: D1=D2=P+D5; D3=P×2; D4=D3×(N?½), (N is an arbitrary natural number), wherein D1 represents a lift gap of the upper motor assembly; D2 represents a lift gap of the lower motor assembly; D3 represents a space width between tips of adjacent teeth of the drive shaft; D4 represents a gap between an upper latch and a lower latch; P represents pitch that is a distance of ascent or descent of the drive shaft; and D5 represents a margin which is a separation space between the teeth and the upper latch or the lower latch when the upper latch or the lower latch is inserted into the teeth of the drive shaft.

Abstract: A magnetic jack type in-vessel control element drive mechanism includes: an upper coil assembly which includes a first sleeve configured to coaxially wrap a control element drive shaft, a first coil, and a first coil housing which is externally coupled to the first sleeve; a lower coil assembly which includes a second sleeve configured to coaxially wrap the control element drive shaft, a second coil, and a second coil housing which is externally coupled to the second sleeve, wherein the lower coil assembly is located under the upper coil assembly, a connecting member which connects the upper coil assembly and the lower coil assembly; a support tube which extends downward from the lower coil assembly; a motor assembly which is located between the control element drive shaft, and the first and second sleeves; and an anti-separation cap which prevents separation of the motor assembly.

Abstract: An upper guide structure for simplification of a refueling procedure in a nuclear power plant includes an upper guide cylinder inserted in an upper end portion of a core support barrel installed inside a nuclear reactor vessel to guide a control rod assembly, a support plate installed at a lower end of the upper guide cylinder and having a plurality of first control rod insertion holes formed therein, hollow control rod assembly upper guide tubes respectively installed in the first control rod insertion holes, and a nuclear fuel alignment plate installed at lower ends of the control rod assembly upper guide tubes and including a plurality of second control rod insertion holes formed at positions corresponding to the control rod assembly upper guide tubes, each of the second control rod insertion holes having an inner diameter which increases to an lower end thereof so that the nuclear fuel assembly guide rod is inserted even when a position alignment error of the nuclear fuel assembly is great, and first cool

Abstract: A method and device of measuring a water level of a frequency analysis type is disclosed. The device is consisted of a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor. The method comprises steps of: generating a source signal to the pipe by the impact apparatus; detecting the response signal of the pipe according the water level by the impact detecting sensor; analyzing the response signal to the frequency response spectra by the signal analyzer; and measuring the water level by comparing to the predetermined frequencies which was obtained by the signal analyzer.