Abstract: Provided is an integrated drawing producing method for common cause tracing. The integrated drawing producing method includes: distinguishing shapes of entities in at least one design drawing and assigning an attribute to each of distinguished entities; synthesizing the entities assigned the attributes in the at least one design drawing in units of a system where a common cause is to be traced; and generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing.

Abstract: Provided is a method of tracing a common cause failure in an integrated drawing. The method includes: synthesizing entities assigned attributes in at least one design drawing in units of a system where a common cause is to be traced; generating an integrated drawing with a hierarchical structure by horizontally or vertically interconnecting the entities assigned the same attribute in the at least one design drawing; and displaying a fault propagation path in the integrated drawing by using an internal tracer, wherein the displaying illustrates state information of the entities on the fault propagation path.

Abstract: A flow control device for mitigating thermal stratification in a mixing tee pipe includes a mixing bowl provided as an empty sphere; a main pipe having a tubular shape, through which a fluid flows, and coupled to the mixing bowl in linkage with the mixing bowl; a branch pipe having a tubular shape, through which a fluid flows, and coupled to the mixing bowl in linkage with the mixing bowl; and a mixing tee pipe having a tubular shape, through which the fluid in the mixing bowl flows, and coupled to the mixing bowl in linkage with the mixing bowl, wherein a fluid introduced from the main pipe and a fluid introduced from the branch pipe are mixed in the mixing bowl and discharged through the mixing tee pipe.

Abstract: A USB security device includes a main body; a connection line connecting the main body to the control system; a first socket into which a USB having a guard is inserted; a second socket into which a USB not having a guard is inserted; and a key switch. The first socket includes a first slide bar having a first connection terminal at a bottom of an end portion thereof; a first connecting rod; a second slide bar having a second connection terminal at a top of an end portion thereof; a second connecting rod; and a crank coupled at opposite ends to the first connecting rod and the second connecting rod and having a crankshaft.

Abstract: A portable plant instrument freezing and bursting prevention device using a non-directional serial connector includes a main body portion, a plurality of heat wire portions, each of the plurality of heat wire portions comprising a male connector having a cylindrical shape, a heat wire having resistance, and a female connector having a cylindrical shape and having a hollow portion with both ends open, which are sequentially coupled to one another, and an end cap inserted into the female connector at an end of the plurality of heat wire portions to short-circuit the female connector, in which the male connector of one of the plurality of heat wire portions is inserted into the female connector of another one of the plurality of heat wire portions, and thus the plurality of heat wire portions are serially connected to one another.

Abstract: Wet-type carbon dioxide capturing equipment includes a CO2 absorption tower where CO2 of an exhaust gas reacts with an absorbent, a CO2 stripping tower where CO2 is separated from a rich solution absorbed the CO2 in the CO2 absorption tower, a reboiler for supplying thermal energy to the CO2 stripping tower to separate the CO2 from the rich solution in the CO2 stripping tower, a first heat exchanger for heating the rich solution by exchanging heat between a lean solution having the CO2 separated therefrom in the CO2 stripping tower and the rich solution, a mechanical vapor recompressor (MVR) for compressing a CO2 gas separated in the CO2 stripping tower, and a second heat exchanger for separating a portion of CO2 from the rich solution by heating the rich solution by exchanging heat between the CO2 gas compressed in the MVR and the rich solution passing through the first heat exchanger, in which the rich solution having CO2 that is not separated in the second heat exchanger is input to the CO2 stripping tower

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: Provided are a method and system for improving control of a steam generator level for preventing oscillation of the steam generator level in a nuclear power plant. In order to prevent oscillation of a steam generator level and resultant shutdown of a nuclear reactor, which may be caused when a high-level priority control function is frequently and repeatedly turned on/off as the steam generator level is excessively increased, by improving a feedwater control system in the nuclear power plant, a proportional integral control value may be controlled to be reduced, and thus, output while a certain condition is met after a high-level priority mode is deactivated or a signal instructing to enter the high-level priority control mode may be controlled not to be output.

Abstract: In an externally integrated steam generator type small modular reactor, a steam generator is arranged along the circumference of a reactor vessel cylindrical shell, and a steam drum is arranged along the circumference of the steam generator. The small modular reactor includes: a nuclear reactor including a hemispherical upper head, the reactor vessel cylindrical shell coupled to the upper head and extending downward from the upper head in a cylindrical shape, and a hemispherical lower head provided on a lower portion of the reactor vessel cylindrical shell, wherein a core is placed in the nuclear reactor; the steam generator surrounding all around the reactor vessel cylindrical shell and including a first penetration hole communicating with an inside of the nuclear reactor; and the steam drum surrounding the circumference of the steam generator and including a second penetration hole communicating with an inside of the steam generator.

Abstract: In an externally integrated once-through steam generator type small modular reactor, a steam generator is arranged along the circumference of a reactor vessel, and secondary cooling water flows in heat transfer tubes and changes to superheated steam. The small modular reactor includes: a nuclear reactor including a hemispherical upper head, the reactor vessel cylindrical shell coupled to the upper head and extending downward from the upper head in a cylindrical shape, and a hemispherical lower head provided on a lower portion of the reactor vessel cylindrical shell, wherein a core is placed in the nuclear reactor; the steam generator surrounding all around the reactor vessel cylindrical shell, the steam generator including a first penetration hole communicating with an inside of the nuclear reactor and a second penetration hole separate from the first penetration hole and communicating with the inside of the nuclear reactor.

Abstract: A fastening-type pipe supporting apparatus capable of supporting a curved pipe against loads acting on a curved portion of the pipe via clamps having curved surfaces and being easily attached to and detached from the curved portion of the pipe. The fastening-type pipe supporting apparatus includes: a first clamp having a semicircular cross-sectional shape and a curved surface with a curvature to surround the curved portion of a pipe; a second clamp having a semicircular cross-sectional shape and a curved surface with a curvature to surround the curved portion of the pipe, the second clamp being coupled to the first clamp; a connection bolt coupling the first clamp with the second clamp; and a washer placed around the connection bolt.

Abstract: Provided is an indication type level indicator including a total reflection prism provided on a float buoyant in the indication type level indicator so that, when laser is irradiated from an upper portion of the float, the laser is scattered by the total reflection prism and thus level legibility is improved. The indication type level indicator includes a chamber filled with a fluid and including a reading portion through which a level of the fluid is measured; the float provided in the chamber and including a material buoyant on the fluid moving vertically in the chamber along with the fluid; the total reflection prism provided on the float and configured to scatter light; and a laser module configured to irradiate laser to the total reflection prism so that the laser irradiated from the laser module is scattered by the total reflection prism to the reading portion.

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 method of the simulation construction for measurement of the control rod insertion time including a three-dimensional modeling operation of an inside wall of the nuclear reactor, a control rod, etc; a flow field configuration operation wherein the flow field is differentially configured by a variable grid system comprising variable cells which change the configuration and by an aligned grid system comprising fixed cells which maintains the configuration; a calculation operation of simulation estimated value for the insertion time by analyzing the thermal-hydraulic phenomenon using the three-dimensional CFD; and a cell change operation, wherein an error between the estimated value and the actual value is verified whether the error lies within the reference range, and, when the error exceeds the reference range, the size of the variable cell and/or of the size of the fixed cell is changed.

Abstract: According to an embodiment of the present disclosure, an apparatus of preventing a malfunction of a circuit breaker may include a circuit breaker and a variable resistor installed on a distributing board, the variable resistor being disposed outside the circuit breaker separately from the circuit breaker, wherein the variable resistor is connected in parallel to an anti-pumping auxiliary relay RW, and total resistance of the anti-pumping auxiliary relay RW and the variable resistor connected in parallel to each other is less than resistance of the anti-pumping auxiliary relay RW.

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 indication type level indicator including a total reflection prism provided on a float buoyant in the indication type level indicator so that, when laser is irradiated from an upper portion of the float, the laser is scattered by the total reflection prism and thus level legibility is improved. The indication type level indicator includes a chamber filled with a fluid and including a reading portion through which a level of the fluid is measured; the float provided in the chamber and including a material buoyant on the fluid moving vertically in the chamber along with the fluid; the total reflection prism provided on the float and configured to scatter light; and a laser module configured to irradiate laser to the total reflection prism so that the laser irradiated from the laser module is scattered by the total reflection prism to the reading portion.

Abstract: A flow control device for mitigating thermal stratification in a mixing tee pipe includes a mixing bowl provided as an empty sphere; a main pipe having a tubular shape, through which a fluid flows, and coupled to the mixing bowl in linkage with the mixing bowl; a branch pipe having a tubular shape, through which a fluid flows, and coupled to the mixing bowl in linkage with the mixing bowl; and a mixing tee pipe having a tubular shape, through which the fluid in the mixing bowl flows, and coupled to the mixing bowl in linkage with the mixing bowl, wherein a fluid introduced from the main pipe and a fluid introduced from the branch pipe are mixed in the mixing bowl and discharged through the mixing tee pipe.

Abstract: A portable plant instrument freezing and bursting prevention device using a non-directional serial connector includes a main body portion, a plurality of heat wire portions, each of the plurality of heat wire portions comprising a male connector having a cylindrical shape, a heat wire having resistance, and a female connector having a cylindrical shape and having a hollow portion with both ends open, which are sequentially coupled to one another, and an end cap inserted into the female connector at an end of the plurality of heat wire portions to short-circuit the female connector, in which the male connector of one of the plurality of heat wire portions is inserted into the female connector of another one of the plurality of heat wire portions, and thus the plurality of heat wire portions are serially connected to one another.

Abstract: Provided is an installation structure for installing control rod drive mechanisms and cable sealing units in a nuclear reactor pressure vessel. The installation structure includes: a sealing flange having a ring shape and being hermetically coupled to an upper pressure vessel and a lower pressure vessel of the nuclear reactor pressure vessel; a cylindrical tube extending downward vertically from an internal edge of the sealing flange; and a support plate provided horizontally to block a lower end portion of the cylindrical tube. A plurality of mounting holes that penetrate through the sealing flange horizontally are arranged in the sealing flange with a predetermined interval therebetween along a circumferential direction, the cable sealing units are inserted and mounted in the plurality of mounting holes, and the control rod drive mechanisms are installed on the support plate to be supported.