Kepco Nuclear Fuel Co., Ltd.

Jae Ik Kim

Dong Geun Ha

Seong Soo Kim

Jin Sun Kim

Kyong Bo Eom

Joo Hong Chun

Su Pil Ryu

Joo Young Ryu

Sang Youn Jeon

Ba Leum Kim

O Cheol Kwon

Hak In Lee

Seung Jae Lee

Yoon Ho Kim

Chung Yong Lee

Sung Yong Lee

Hun Jang

Yong Kyoon Mok

Tae Sik Jung

Yeon Soo Na

Min Young Choi

Dae Gyun Ko

Dae Gyun Go

A method of manufacturing a zirconium alloy for a nuclear fuel cladding tube includes melting a mixture of 0.5 wt % of Nb, 0.4 wt % of Mo, 0.1 to 0.15 wt % of Cu, 0.15 to 0.2 wt % of Fe, and a balance of zirconium to prepare a melted ingot; heat treating the melted ingot at 1,000 to 1,050&#xb0; C. for 30 to 40 min. followed by quenching in water to prepare a heat-treated ingot; preheating the heat-treated ingot at 630 to 650&#xb0; C. for 20 to 30 min. to prepare a preheated ingot followed by hot rolling the preheated ingot at a reduction ratio of 60 to 65% to provide a hot-rolled material; thrice performing vacuum annealing followed by cold-rolling; and vacuum annealing a third cold-rolled material in a final vacuum annealing at 510 to 520&#xb0; C. for 7 to 9 hrs. to provide the zirconium alloy as a cold-rolled material.

Method of manufacturing a corrosion-resistant zirconium alloy for a nuclear fuel cladding tube

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

Jae Ik Kim