• Title/Summary/Keyword: cladding system

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Residual Stress Analysis of Laser Cladding Repair for Nuclear Steam Generator Damaged Tubes (원전 증기발생기 레이저 클래딩 보수부위 잔류응력 해석)

  • Han, Won-Jin;Lee, Sang-Cheol;Lee, Seon-Ho
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.56-60
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    • 2008
  • Laser cladding technology was studied as a method for upgrading the present repair procedures of damaged tubes in a nuclear steam generator and Doosan subsequently developed and designed a new Laser Cladding Repair System. One of the important features of this newly developed Laser Cladding Repair System is that molten metal can be deposited on damaged tube surfaces using a laser beam and filler wire without the need to install sleeves inside the tube. Laser cladding qualification tests on the steam generator tube material, Alloy 600, were performed according to ASME Section IX. Residual stress analyses were performed for weld metal and heat affected zone of as-welded and PWHT with SYSWELD software.

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The wire laser cladding system for repairing inner side of Alloy 600 tubes (Alloy 600 전열관 내면 보수용 와이어 송급 레이저 클래딩 장치 개발)

  • Han, Won-Jin;Kim, U-Seong;Lee, Sang-Cheol;Lee, Seon-Ho;Lee, Chang-Yeol
    • Proceedings of the KWS Conference
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    • 2007.11a
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    • pp.196-198
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    • 2007
  • Laser cladding technology was studied as a method for upgrading the present repair procedures of damaged tubes in a nuclear steam generator and Doosan subsequently developed and designed a new Laser Cladding Repair System. One of the important features of this newly developed Laser Cladding Repair System is that molten metal can be deposited on damaged tube surfaces using a laser beam and filler wire without the need to install sleeves inside the tube. Laser cladding qualification tests on the steam generator tube material, Alloy 600, were performed according to ASME Section IX.

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Present State Investigation and Analysis of Cladding System in High rise Residential Buildings (초고층 주거건물 외피시스템의 현황조사 및 분석)

  • Seok Ho-Tae;Kwak Hyun-Chul;Song Seung-Yeong
    • Journal of the Korean housing association
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    • v.15 no.5
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    • pp.43-50
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    • 2004
  • As residential buildings becomes high rise buildings, the new cladding system was needed for structure system, and unpredictable problems were found in it. The aim of this study is to analysis the present state and find improvement of indoor environment in high rise residential building, which used curtain wall system. Then, suggest to create comfortable indoor environment for high rise residential buildings in the process of design.

High-fidelity numerical investigation on structural integrity of SFR fuel cladding during design basis events

  • Seo-Yoon Choi;Hyung-Kyu Kim;Min-Seop Song;Jae-Ho Jeong
    • Nuclear Engineering and Technology
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    • v.56 no.2
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    • pp.359-374
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    • 2024
  • A high-fidelity numerical analysis methodology was proposed for evaluating the fuel rod cladding integrity of a Prototype Gen IV Sodium Fast Reactor (PGSFR) during normal operation and Design basis events (DBEs). The MARS-LMR code, system transient safety analysis code, was applied to analyze the DBEs. The results of the MARS-LMR code were used as boundary condition for a 3D computational fluid dynamics (CFD) analysis. The peak temperatures considering HCFs satisfied the cladding temperature limit. The temperature and pressure distributions were calculated by ANSYS CFX code, and applied to structural analysis. Structural analysis was performed using ANSYS Mechanical code. The seismic reactivity insertion SSE accident among DBEs had the highest peak cladding temperature and the maximum stress, as the value of 87 MPa. The fuel cladding had over 40 % safety margin, and the strain was below the strain limit. Deformation behavior was elucidated for providing relative coordinate data on each active fuel rod center. Bending deformation resulted in a flower shape, and bowing bundle did not interact with the duct of fuel assemblies. Fuel rod maximum expansion was generated with highest stress. Therefore, it was concluded that the fuel rod cladding of the PGSFR has sufficient structural safety margin during DBEs.

The effect of peak cladding temperature occurring during interim-dry storage on transport-induced cladding embrittlement

  • Kim, Kyu-Tae
    • Nuclear Engineering and Technology
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    • v.52 no.7
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    • pp.1486-1494
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    • 2020
  • To evaluate transport-induced cladding embrittlement after interim-dry storage, ring compression tests were carried out at room temperature(RT) and 135 ℃. The ring compression test specimens were prepared by simulating the interim-dry storage conditions that include four peak cladding temperatures of 250, 300, 350 and 400 ℃, two tensile hoop stresses of 80 and 100 MPa, two hydrogen contents of 250 and 500 wt.ppm-H and a cooling rate of 0.3 ℃/min. Radial hydride fractions of the ring specimens vary depending on those interim-dry storage conditions. The RT compression tests generated lower offset strains than the 135 ℃ ones. In addition, the RT and 135 ℃ compression tests indicate that a higher peak cladding temperature, a higher tensile hoop stress and the lower hydrogen content generated a lower offset strain. Based on the embrittlement criterion of 2.0% offset strain, an allowable peak temperature during the interim-dry storage may be proposed to be less than 350 ℃ under the tensile hoop stress of 80 MPa at the terminal cool-down temperature of 135 ℃.

A Study on the Mechanical Properties of Nuclear Fuel Cladding Materials (원자로용 핵연료 피복재의 인장특성에 관한 연구)

  • Bae, Bong-Kook;Song, Chun-Ho;Seok, Chang-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.2
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    • pp.231-238
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    • 2003
  • The fuel of light water reactor is used for several years under high temperature and pressure, so it needs to be clad with high corrosion resistance material. The cladding materials must have the characteristics of low absorption of a neutron and high corrosion resistance. Zircaloy-2 in Boiling Water Reactor, Zircaloy-4 in Pressurized Water Reactor have been used as cladding materials and Zirlo has been developed as the material for preventing the corrosion. If the fracture of the cladding tube occurs during operation, it will cause the economic loss to shut down and replace the system. So it is needed to evaluate the integrity of the cladding materials. In this paper, the tensile characteristics of the cladding materials were investigated for the basic research of fracture characteristics. Also the residual stress was analyzed to compare the tube type(original type) specimen and the flattened type specimen.

The Fire Resistant Performance of the High-Strength Concrete Column Covered with Aerogel Compound Inorganic Blanket and Gypsum board (에어로젤 복합 무기질 블랭킷 및 석고보드 피복 고강도콘크리트 기둥의 내화성능)

  • Yeo, In-Hwan;An, Jae-Hong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.201-203
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    • 2011
  • The purpose of this study was to develop and evaluate of fire resistive cladding systems for HSC(high-strength concrete) column, which was mainly constructed with aerogel blanket insulation material. The aerogel blanket-fire protective gypsum board cladding system showed that it clearly secure the fire resistance performance of HSC column when the reinforcing measures had achieved for four cross-sectional edge sides of structure and the system is well continued during the test period with no significant deformation or separation etc. It was checked out the 20mm thickness cladding system consist with AG(5mm)+FGB(15mm) can secure 3hour-fire resistance performance adequately.

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Robustness and resilience of a passive control solution assembling buffer and cladding panels

  • Balzari, Ugo;Balzari, Andrea
    • Smart Structures and Systems
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    • v.20 no.5
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    • pp.637-640
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    • 2017
  • The adoption of cladding panels as dissipation device is a sort of passive control "ante litteram" for residential and commercial buildings. This paper gives details on the current technology outlining the difference between buffer panels and cladding panels. The discussion of robustness and resilience of the resulting system is afforded. It is shown that the strength of such solution, originally related to economy and light weight, is mainly associated with the respect of the main robustness requisites, as well as the short time it requires for removal and replacement (resilience).

Zirconia Ceramic Powder Coating of Ti-6AI-4V by Laser Cladding (레이저 클래딩을 이용한 Ti-6AI-4V의 Zirconia 세라믹 분말 코팅)

  • Kang, Kyung-Ho;Kim, Jae-Do
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.7
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    • pp.783-788
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    • 2011
  • The recent development of bio-ceramic material is being studied in various bio-material engineering field. There are lots of technical difficulties because manufacturing or bonding technique are required bio-friendliness, cleanliness and persistence. Zirconia ceramic powder is cladded on Ti-6AI-4V metallurgically by laser cladding processing. Laser cladding system with powder feeding delivery is designed and manufactured for optimum processing condition. Increasing of manufacturing speed and good quality of clad layer are achieved by application of preheating of substrate before laser cladding. The thin dilution and good clad layer on the substrate are obtained for applications of bio-materials such as the dental materials and the articulated joints of human body.