Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on the Lateral Dynamic Crush Strength of a Spacer Grid Assembly for a LWR Nuclear Fuel Assembly

경수로 핵연료집합체 지지격자체의 횡방향 충격강도 연구

  • Received : 2010.01.28
  • Accepted : 2010.07.19
  • Published : 2010.09.01
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Abstract

A spacer grid assembly is one of the most important structural components in a Light Water Reactor(LWR) nuclear fuel assembly. In the case of the Zircaloy spacer grid assembly, the primary design consideration is to ensure that lateral dynamic crush strength of the spacer grid assembly is sufficient to resist design basis loads and thereby prevent seismic accidents, without a significant increase in the hydraulic head loss for the reactor coolant in the reactor core. In this study, factors affecting the lateral dynamic crush strength of a spacer grid assembly were analyzed by performing lateral dynamic crush tests and finite element analyses. Further, an effective and economical method to enhance the lateral dynamic crush strength of the spacer grid assembly is proposed.

지지격자체는 경수로 핵연료집합체의 가장 중요한 핵심 구조부품 중에 하나이다. 질칼로이 지지격자체 설계시의 우선적으로 고려해야 할 사항은 지지격자체가 원자로심에서 냉각수의 심한 수두손실을 유발하지 않으면서 지진사고를 고려한 설계하중 하에서 충분한 횡방향 충격강도를 갖도록 하는 것이다. 본 연구에서는 시험과 유한요소해석을 통해 지지격자체의 횡방향 충격강도에 영향을 주는 인자들에 대한 분석을 수행하였고, 지지격자체 제조용 질칼로이 원자재 소요량을 획기적으로 줄이면서 지지격자체의 횡방향 충격강도를 개선할 수 있는 방안을 제시하였다.

Keywords

References

  1. Kunz, H. J. and Song, K. N., 1987, Fuel Assembly Mechanical Design Manual, Siemens/KWU Work-Report U6 312/87/e326.
  2. Kim, H. K. et al., 1997, Analysis Report on the Spacer Grid US Patent Registered in USA, KAERI/TR-867/97.
  3. Lee, S. H., Song, K. N., and Kim, J. Y., 2007, "Design Improvement of an OPT-H Type Nuclear Fuel Rod Support Grid Using an Axiomatic Design and an Optimization," J. of Mechanical Science and Technology, Vol. 21, pp. 1191-1195. https://doi.org/10.1007/BF03179035
  4. Lee, S. B., Song, K. N., and Kim, Y. W., 2008, "Parametric Study for a Dimple Location in a Spacer Grid Under the Critical Impact Load," J. of Mechanical Science and Technology, Vol. 22, pp. 2024-2029. https://doi.org/10.1007/s12206-008-0620-5
  5. Song, K. N. and Kim, S. S., 2007, "Determination of Optimum Welding Parameters for a Laser Welded Spacer Grid Assembly for PWRs," J. of Laser Micro/Nanoengineering, Vol. 2, No. 1, pp. 95-99. https://doi.org/10.2961/jlmn.2007.01.0017
  6. Song, K. N. and Kim, S. S., 2007, Korea Patent # 770944.
  7. Song, K. N., Lee, S. B., Lee, J. J., and Park, G. J., 2008, "Design Variables That Affect the Crush Strength of a PWR Spacer Grid Assembly," Proc. of KNS Fall Meeting, PyeongChang, Korea.
  8. Song, K. N. and Lee, S. B., 2008, "Effect of a Dimple Location in a Spacer Grid on the Impact Strength," ICONE16-48144, May11-15, Orlando, Florida, USA. https://doi.org/10.1115/ICONE16-48144
  9. Song, K. N., Lee, S. B. and Lee, A. H., 2010, "New Spacer Grid to Enhance the Mechanical/ Structural Performance," Journal of Nuclear Science and Technology, Vol. 47, No. 3, pp. 295-303. https://doi.org/10.3327/jnst.47.295
  10. Song, K. N. and Lee, S. B., 2007, "Analysis of Impact Strength Due to the Variation of Weld Length for the Nuclear Spacer Grid Assembly," Proc. of KSME Fall Meeting, PyeongChang, Korea.
  11. Song, K. N. and Lee, S. B., 2009, "Analysis of Crush Strength Test Results for a Spacer Grid Assembly of a LWR Nuclear Fuel Assembly," Proc. of KSME Spring Meeting, Seoul, Korea.
  12. Lee, S. B. and Song, K. N., 2007, "The Evaluation of Impact Strength of IFM Support Grid and Its Experimental Verification," Proc. of KNS Fall Meeting, PyeongChang, Korea.
  13. Leuker, 1987, "Buckling Strength of Spacer Grid," Siemens-KWU Test Report U9/213/87/137e.
  14. Shiffer, 1988, "Fuel Mechanical Test Report," Siemens-KWU Work Report U6/312/88/e 121a.
  15. Kim, K. T., 2002, "Development of Advanced Nuclear Fuel for KSNPs," Final Report Submitted to MOST.
  16. Yoon, K. H. and Song, K. N., 2006, "Buckling Behavior as the Configuration of a Grid Assembly Under Later Impact Load," Proc. of 1st KSME Material and Fracture Section Meetings.
  17. ASTM E8M-99, 1999: Standard Test Methods for Tension Testing of Metallic Materials.
  18. ABAQUS/Standard Version 6.8 User's Manual, 2009, H.K.S., USA.
  19. Song, K. N., Yoon, K. H. and Lee, J. J., 2005, "Development of Impact Analysis Model on the Spcaer Grid Assembly for Pressurized Light Water Reactor Fuel," Proc. of KSME CAE Section Spring Meeting, Seoul, Korea.
  20. Song, K. N. and Lee, S. B., 2008, "Suggestions to Enhance the Crush Strength of a LWR Spacer Grid Assembly," Proc. of KNS Spring Meeting, Gyeongju, Korea.
  21. Song, K. N., Lee, S. H. and Lee, S. B., 2008, "Impact Analysis and Test for the Spacer Grid Assembly of a Nuclear Fuel Assembly," Int. J. of Modern Physics B, Vol. 22, No. 9, 10 & 11, pp. 1228-1234. https://doi.org/10.1142/S021797920804658X

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