• 제목/요약/키워드: 지지격자

검색결과 195건 처리시간 0.031초

이중판 노즐형 지지격자 스프링의 지지 강성감소를 위한 형상 개선 (Shape Modification for Decreasing the Spring Stiffness of Double-plated Nozzle Type Spacer Grid Spring)

  • 강흥석;송기남;이재호;이강희
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집A
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    • pp.400-405
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    • 2001

  • Nozzle of the double-plated grid plays the role of the spring to support a fuel rod as well as to provide the coolant path in grid. The nozzle was known to be necessary to reduce the spring stiffness for supporting performance. In this study the contact analysis between the fuel rod and the nozzle type spacer grid was performed by using ABAQUS standard to propose the preferable shape in tenn of spring performance. Two small cuts at the upper and lower part of the nozzle appeared to have a minor effect in decreasing the nozzle stiffness. A long slot at the center of the nozzle was turned out not only to decrease the spring constant as desired but also to increase the elastic displacement.

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지지격자를 갖는 $5\times{5}$ PWR 봉다발에서의 난류유동 측정 (Measurements of Turbulent How in $5\times{5}$ PWR Rod Bundles With Spacer Grids)

  • Yang, Sun-Kyu;Chung, Heung-June;Chun, Se-Young;Chung, Moon-Ki
    • Nuclear Engineering and Technology
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    • 제24권3호
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    • pp.263-273
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    • 1992

  • 핵연료 집합체의 속도분포, 압력강하는 열수력 설계와 안전해석에 중요하다. 본 실험적 연구의 목적은 봉다발 지지 격자 하류에서의 수력학적 혼합을 고찰하는데 있다. 이 연구에서 가압경수로형 5X5 봉다발 부수로의 상세한 수력학적 특성들을 1차익 He-Ne LDV를 이용하여 측정하였다. 축방향 유속, 난류강도와 압력강하를 주로 측정하였고 LDV의 정렬을 조정하여 측방향의 유속, 난류강도, Reynolds 전단응력 등도 역시 측정하였다. 봉다발의 마찰계수와 지지 격자의 손실계수는 측정된 압력 강하로부터 평가하였다. 서로 다른 종류의 지지 격자의 수력학적 혼합성능을 이웃하는 부수로 간에서의 난류 횡류 혼합률을 예측함으로써 고찰할 수 있었다.

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이중냉각연료에서 지지격자의 압력손실에 대한 엔탈피 증가 (Enthalpy Rise for Pressure Loss of Spacer Grids of Dual Coolant Fuel)

  • 전건호;전태현;신창환
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.3473-3478
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    • 2007

  • A dual side cooling annular fuel having internal and external coolant channels has many advantages basically due to low fuel temperature and high DNBR margin, which can make a significant increase of core power density possible. So recently a 12x12 square annular fuel array was proposed for the fuel assembly to be reloaded without structural interference with operating reactors of OPR-1000s. Even through the inherent potential of the annular fuel on the high power density, it may be seriously eroded in the case of a severe unbalanced mass flux split to the internal and external channels in standpoint of DNB. Mass flux split is determined pressure drop characteristics between inner and outer channels. The spacer grids binding fuel array influence greatly the pressure drop in outer channels and the mass flux split. As an important factor of DNB behavior, the enthalpy differences at both channel exits were evaluated using the mass flux splits.

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가압경수로 핵연료 지지격자의 기계/구조적 시험장치 구축 (Set-up of Mechanical/Structural Test Facilities on the Spacer Grid of the PLWR Fuel)

  • 송기남;윤경호;강흥석;김형규
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집A
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    • pp.355-360
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    • 2001

  • Design requirements for the nuclear fuel assembly grid of the pressurized light water reactor(PLWR) are scrutinized from the mechanical/structural point of view. As a result of the scrunity, mechanical/structural test facilities on the spacer grid of the PLWR Fuel are set up in KAERI to find out their mechanical/structural performance.

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