Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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DROP IMPACT ANALYSIS OF PLATE-TYPE FUEL ASSEMBLY IN RESEARCH REACTOR

  • Received : 2013.12.06
  • Accepted : 2014.03.14
  • Published : 2014.08.25
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Abstract

In this research, a drop impact analysis of a fuel assembly in a research reactor is carried out to determine whether the fuel plate integrity is maintained in a drop accident. A fuel assembly drop accident is classified based on where the accident occurs, i.e., inside or outside the reactor, since each occasion results in a different impact load on the fuel assembly. An analysis procedure suitable for each drop situation is systematically established. For an accident occurring outside the reactor, the direct impact of a fuel assembly on the pool bottom is analyzed using implicit and explicit approaches. The effects of the key parameters, such as the impact velocity and structural damping ratios, are also studied. For an accident occurring inside the reactor, the falling fuel assembly may first hit the fixing bar at the upper part of the standing fuel assembly. To confirm the fuel plate integrity, a fracture of the fixing bar should be investigated, since the fixing bar plays a role in protecting the fuel plate from the external impact force. Through such an analysis, the suitability of an impact analysis procedure associated with the drop situation in the research reactor is shown.

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References

  1. International Atomic Energy Agency, "Accident Analysis for Nuclear Power Plants", IAEA Safety Reports Series, No. 23, Vienna (2002)
  2. International Atomic Energy Agency, "Safety of Research Reactors", IAEA Safety Standards Series, No. NS-R-4, Vienna (2005)
  3. H.J. Wu, C.C. Tseng, and S.C. Cheng, "A Numerical Analysis for a BWR Fuel Assembly Drop Event", J. Nucl. Sci. Technol., vol. 43, pp. 1068-1073 (2006). https://doi.org/10.1080/18811248.2006.9711196
  4. I. Namgung, S.H. Jeong, D.H. Lee, T.S. Choi, "KSNP+ Reactor Vessel Head Drop Analysis for a 5.5M Free Fall", J. Mech, Sci, Technol., vol. 19, pp. 51-60 (2005) https://doi.org/10.1007/BF02916104
  5. P. Petkevich, V. Abramov, V. Yuremenko, V. Piminov, V. Makarov and A. Afanasiev, "Simulation of the nuclear fuel assembly drop test with LS-Dyna", Nucl. Eng. and Des., vol. 269, pp. 136-141 (2014) https://doi.org/10.1016/j.nucengdes.2013.08.019
  6. J.S. Yim, H.J. Kim, Y.W. Tahk, J.Y. Oh and B.H. Lee, "Evaluation of Fuel Plate Integrity during a Fuel Assembly Drop Accident Using an Energy Method", Proc. Int. Meeting on Reduced Enrichment for Research and Test Reactors: (RERTR 2012), Poland, Oct. 14-17, 2012.
  7. ANSYS LS-DYNA User's Guide, release 14, ANSYS INC., Southpointe, 275 Technology Drive, Canonsburg, PA 15317, USA (2011)
  8. ANSYS Structural Analysis Guide, release 14, ANSYS INC., Southpointe, 275 Technology Drive, Canonsburg, PA 15317, USA (2011).
  9. U.S Nuclear Regulatory Commission, "Safety Evaluation Report related to the Evaluation of Low-Enriched Uranium Silicide-Aluminum Dispersion Fuel for using in Non- Power Reactors," NUREG-1313 (1988)
  10. Nuclear Safety and Security Commission Notice 2012-11, Korea (2012).
  11. ASME Boiler and Pressure Vessel Code, Section III, The American Society of Mechanical Engineers (2004).
  12. R.H.J. Sellin, R.T. Moses, Drag Reduction in Fluid Flows: Techniques for Friction Control, Ellis Horwood Ltd., England (1989)
  13. D. Hasanloo, H. Pang, G. Yu, "On the Estimation of the Falling Velocity and Drag Coefficient of Torpedo Anchor during Acceleration," Ocean Eng., vol. 42, pp. 135-146 (2012). https://doi.org/10.1016/j.oceaneng.2011.12.022
  14. Sighard F. Hoerner, Fluid-Dynamic Drag, Brick Town, N.J., USA (1965)
  15. P. Wriggers, "Computational Contact Mechanics", John Wiley & Sons Ltd. Chichester (2002).
  16. G.R. Cowper and P.S. Symonds, "Strain Hardening and Strain Rate Effects in the Impact Loading of Cantilever Beams", Brown Univ. Applied Mathematics Report, pp. 28 (1958).
  17. P. Ludwik, Element der technologischen Mechanik, Springer (1909).

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