• Title/Summary/Keyword: Grid spacer

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PERFORMANCE EVALUATION OF NEW SPACER GRID SHAPES FOR PWRS

  • Song, Kee-Nam;Lee, Soo-Bum;Lee, Sang-Hoon
    • Nuclear Engineering and Technology
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    • v.39 no.6
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    • pp.737-746
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    • 2007
  • A spacer grid, which is one of the most important structural components in a PWR fuel assembly, supports its fuel rods laterally and vertically. Based on in-house design experience, scrutiny of the design features of advanced nuclear fuels and the patents of other spacer grids, KAERI has devised its own spacer grid shapes and acquired patents. In this study, a performance evaluation of KAERI's spacer grid shapes was carried out from mechanical/structural and thermohydraulic view points. A comparative performance evaluation of commercial spacer grid shapes was also carried out. The comparisons addressed the spring characteristics, fuel rod vibration characteristics, fretting wear resistance, impact strength characteristics, CHF enhancement, and the pressure drop level of the spacer grid shapes. The results show that the performances of KAERI's spacer grid shapes are as good as or better than those of the commercial spacer grid shapes.

Performance Test on the KAERI Designed Spacer Grids for the Advanced PWR (경수로용 고유 지지격자의 성능시험)

  • Song, Gi-Nam;Yun, Gyeong-Ho;Gang, Heung-Seok;Kim, Hyeong-Gyu
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.431-437
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    • 2003
  • KAERI has contrived 14 kinds of spacer grid shapes of its own since 1997 and applied for Korean and US patents. To date. KAERI has obtained US and Korean patents for 6 kinds of spacer grid shapes among them. Tn this study. performance test on two spacer grid shapes that are assumed to be the most effective candidates for the spacer grid of the next generation nuclear fuel in Korea was carried Qui through the mechanical/structural test and analysis. The test result has shown thai the performances of the candidates are better or not worse than that of the current spacer grid.

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Mechanical/Structural Performance Analysis and Test on the KAERI Designed Spacer Grids for the PWR (한국원자력연구소에서 개발한 가압경수로용 핵연료 지지격자의 기계/구조적 성능 해석 및 시험)

  • Song, K.N.;Yoon, K.H.;Kang, H.S.;Choe, Myeong-Hwan
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1297-1302
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    • 2003
  • KAERI has contrived 15 kinds of spacer grid shapes of its own since 1997 and applied for domestic and foreign patents. To date, KAERI has obtained US and ROK patents for 6 kinds of spacer grid shapes among them and the others are under review in USA, EC, China, and ROK. In this study, mechanical/structural performance analysis and test on two spacer grid shapes that are assumed to be the most effective candidates for the spacer grid of the next generation nuclear fuel in Korea was carried out. The result has shown that the performances of the candidates are better or not worse than those of the current spacer grid.

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Performance Analysis and Test on the KAERI Designed Spacer Grids for the PWR (한국원자력연구소에서 개발한 가압경수로용 핵연료 지지격자의 성능 해석 및 시험)

  • Song, K.N.;Yoon, K.H.;Kang, H.S.;Choi, M.H.;Chun, T.H.
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.432-437
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    • 2004
  • KAERI has contrived 16 kinds of spacer grid shapes of its own since 1997 and applied for domestic and foreign patents. To date, KAERI has obtained US and ROK patents for 11 kinds of spacer grid shapes among them and the others are under review in USA, EC, China, and ROK. In this study, detailed performance analysis and test on two spacer grid shapes that are assumed to be the most effective candidates for the spacer grid of the next generation nuclear fuel in Korea was carried out. The result has shown that the performances of the candidates are better or not worse than those of the current spacer grid.

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Crush Strength Analysis of a Spacer Grid for PWR Nuclear Fuel Considering Mechanical Properties in Weld Zone (용접부 기계적 물성치를 고려한 경수로 핵연료 지지격자의 충격해석)

  • Song, Kee-Nam;Lee, Sang-Hoon
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.8 no.2
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    • pp.7-13
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    • 2012
  • A spacer grid which is one of the most important structural components in a pressurized water reactor fuel is an interconnected array of slotted grid straps, welded at the intersections to form an egg-crate structure. The spacer grid is required to not only protect fuel rods stably but also have sufficient lateral crush strength for the sake of enabling shut-down of the nuclear reactor during abnormal operating environments. Then, the lateral crush strength of the spacer grid is closely related with welding quality of the spacer grid. Previous research on the crush strength analysis of the spacer grid had been performed using only parent material properties. In this study, to investigate the effect on the crush strength of the spacer grid when used mechanical properties in weld zone instead of parent material properties, crush strength analysis considering mechanical properties in weld zone obtained from the instrumented indentation technique was performed and compared the results with the previous research.

Structural Design Considerations on the Spacer Grid Assembly of PWR Nuclear Fuel (경수로 핵연료 지지격자체 구조설계에 대한 소고)

  • Song, Kee-nam
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.7 no.3
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    • pp.54-60
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    • 2011
  • A spacer grid, which supports nuclear fuel rods laterally and vertically with a friction grip, is one of the most important structural components in a PWR fuel. The form of grid strap and supporting parts such as grid spring and dimple is known to be closely related with the mechanical/structural performance of spacer grid and nuclear fuel assembly. In this study, reviewing various research results for enhancing the performance of the spacer grid, some structural design considerations and research directions on the spacer grid assembly are suggested for further study.

Impact Analysis of the Spacer Grid Assembly for PWR Fuels(III) (경수로 핵연료 지지격자체의 충격해석(III))

  • Song, Kee-Nam;Lee, S.B.;Lee, H.A.;Kim, J.K.;Park, Gyung-Jin
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.305-308
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    • 2007
  • The spacer grid assembly is one of the main structural components of the nuclear fuel assembly of a PWR. The spacer grid assembly supports and aligns the fuel rods, guides the fuel assemblies past each other during handling and, if needed, sustains lateral seismic loads. The ability of the spacer grid assembly to resist the lateral loads is usually characterized in terms of its dynamic and static crush strengths, which are acquired from tests. In this study, a finite element analysis on the dynamic crush strength of spacer grid assembly specimens is carried out and compared with test results.

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EFFECTS OF GRID SPACER WITH MIXING VANE ON ENTRAINMENTS AND DEPOSITIONS IN TWO-PHASE ANNULAR FLOWS

  • KAWAHARA, AKIMARO;SADATOMI, MICHIO;IMAMURA, SHOGO;SHIMOHARAI, YUTA;HIRAKATA, YUDAI;ENDO, MASATO
    • Nuclear Engineering and Technology
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    • v.47 no.4
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    • pp.389-397
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    • 2015
  • The effects of mixing vanes (MVs) attached to a grid spacer on the characteristics of air-water annular flows were experimentally investigated. To know the effects, a grid spacer with or without MV was inserted in a vertical circular pipe of 16-mm internal diameter. For three cases (i.e., no spacer, spacer without MV, and spacer with MV), the liquid film thickness, liquid entrainment fraction, and deposition rate were measured by the constant current method, single liquid film extraction method, and double liquid film extraction method, respectively. The MVs significantly promote the re-deposition of liquid droplets in the gas core flow into the liquid film on the channel walls. The deposition mass transfer coefficient is three times higher for the spacer with MV than for the spacer without MV, even for cases 0.3-m downstream from the spacer. The liquid film thickness becomes thicker upstream and downstream for the spacer with MV, compared with the thickness for the spacer without MV and for the case with no spacer.

Investigation of Spacer Grid Thermal Mixing Performance Based on Hydraulic Tests

  • Yang, Sun-Kyu;Min, Kyung-Ho;Chung, Moon-Ki
    • Proceedings of the Korean Nuclear Society Conference
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    • 1995.10a
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    • pp.377-382
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    • 1995
  • An evaluation method of spacer grid thermal mixing performance in rod bundles is suggested based on hydraulic tests in a single phase flow. Heat transfer correlation was derived by the analogy between momentum and heat transfer. Three of major factors, such as blockage ratio of spacer grid, convective flow swirling, and turbulent intensity, were found to be significantly influential to the spacer grid thermal mixing performance. Local heat transfer near spacer grid was predicted for the hydraulic test of 6 ${\times}$ 6 rod bundles with neighboring different spacer grids.

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Welding Quality Evaluation on the LASER Welding Parts of the Spacer Grid Assembly for PWR Fuel Assembly (경수로 원전연료용 지지격자체의 LASER 용접부위 평가)

  • Song Gi Nam;Yun Gyeong Ho;Gang Heung Seok;Lee Gang Hui;Kim Su Seong
    • Proceedings of the KWS Conference
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    • v.43
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    • pp.67-69
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    • 2004
  • The fuel assemblies as the nuclear fuel for the pressurized water reactor(PWR) are loaded in the reactor core throughout the residence time of three to five years. The spacer grid assembly, which is an interconnected array of slotted grid straps and is welded at the intersections to form an egg crate structure, is one of the main structural components of the fuel assembly. The spacer grid assembly is structurally required to have enough buckling strength under various kinds of lateral load acting on the fuel assembly so as to keep the fuel assembly straight. To meet the requirement, integrity on the spacer grid welding parts should be carefully checked. In this study, welding quality of the spacer grid assembly welded by several welding companies are examined and compared.

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