Kepco Nuclear Fuel Co., Ltd.

Joo Hong Chun

Seong Soo Kim

Su Pil Ryu

Ba Leum Kim

Nam Gyu Park

Jong Sung Yoo

Dong Geun Ha

Kyong Bo Eom

Jin Sun Kim

Joo Young Ryu

Sang Youn Jeon

Jae Ik Kim

O Cheol Kwon

Hak In Lee

Do Gwan Lee

System for separating and coupling a nuclear fuel assembly from/to a top nozzle which has a flow channel plate with guide holes. The system includes a lock insert and a separation member. The lock insert includes an insertion part provided on a top portion of a hollow body. The separation member is configured to separate the insertion part from a guide hole. The insertion part is variable in size. The insertion part comprises a first latching member and a second latching member, each having a step which contacts the flow channel plate. The first latching member includes a latching groove which is inserted into a member protruding from the top surface of the flow channel plate. The second latching member contacts a bottom surface of the flow channel plate. The separation member provides a space accommodating an outer circumferential surface of the first latching member.

System including a member configured to separate a lock insert from a guide hole in a top nozzle plate of a nuclear fuel assembly

Disclosed is a system for separating and coupling a top nozzle of a nuclear fuel assembly. There is provided a lock insert configured to support the top nozzle of the nuclear fuel assembly by being coupled to a guide hole provided in a flow channel plate of the top nozzle, the lock insert including: a body in a hollow shape; and an insertion part provided on a top portion of the body and inserted into the guide hole, wherein a circumference of the insertion part is variable in size, thereby being capable of being inserted into the guide hole. Accordingly, disassembly and reassembly of the top nozzle of the nuclear fuel assembly and the lock insert are simplified, thereby simplifying and reducing the number of processes involved therein. Accordingly, the system is effective for maintenance and repair of the nuclear fuel assembly.

System for separating and coupling top nozzle of nuclear fuel assembly

Embodiments of a bottom nozzle of a nuclear fuel assembly provided with flow holes by utilizing a layered aircraft airfoil structure are provided. The bottom nozzle not only increases efficiency of filtering foreign substances by minimizing a size of the flow holes by constituting a shape of flow holes into cross stripes but also prevents coolant water flow velocity drop through prevention of coolant water pressure drop by constituting a lateral sectional shape of the grid frames constituting the cross stripes into an aircraft airfoil type.

Bottom nozzle of nuclear fuel assembly provided with flow holes by utilizing layered aircraft airfoil structure

The present invention relates to a top nozzle and a nuclear reactor in which an in-core instrument, which is supposed to be inserted through a top head of a nuclear reactor, is inserted through a guide pin for an upper core plate. In a nuclear reactor including guide pins for aligning a top nozzle for a nuclear fuel assembly with an upper core plate of a nuclear reactor, a guide hole () is axially formed through the guide pins () and in-core instruments () are inserted through the guide holes ().

Nuclear fuel assembly top nozzle having in-core instrument insertion structure using an upper core plate hollow guide pin

The present invention relates to a lower end fitting for reducing flow resistance due to an in-core instrument in a nuclear fuel assembly, that is, a lower end fitting () having a plurality of flow holes for a nuclear fuel assembly, in which the flow holes () are formed under an assembly groove in which an instrumentation tube () for a nuclear fuel assembly is inserted, and at least two or more flow holes () are formed at a predetermined distance from the central axis (C) of the instrumentation tube ().

Lower end fixing body for improving flow path resistance of in-core detector

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Daejeon, South Korea

Joo Hong Chun