An Experimental Study on the Transient Interaction Between High Temperature Thermite Melt and Concrete

  • Nho, Ki-Man (Korea Electric Power Research Institute) ;
  • Kim, Jong-Hwan (Korea Atomic Energy Research Institute) ;
  • Kim, Sang-Baik (Korea Atomic Energy Research Institute) ;
  • Shin, Ki-Yeol (Yeungnam University School of Mechanical Engineering) ;
  • Mo Chung (Yeungnam University School of Mechanical Engineering)
  • Published : 1997.08.01

Abstract

During postulated severe accidents in Light water Reactors, molten corium which was ejected from the reactor vessel bottom, may erode the concrete basemat of the containment and there by threaten the containment integrity. This study experimentally examines the molten core-concrete interaction (MCC) using 20kg of thermite melt (Fe + $Al_2$O$_3$) and the concrete, used in Yonggwang Nuclear Power Plant Units 3 and 4 (YGN 3 & 4) in Korea. The measured data are the downward heat fluxes, concrete erosion rate, gases and particle generation rates during MCCI. Transient results ore compared with those of TURCIT experiment conducted by SNL in USA. The peak downward heat flux to the concrete was measured to be about 2.1㎿/$m^2$. The initial concrete erosion rate was 175cm per hour, decreasing to 30cm per hour. It was shown from the post-test that the erosion was progressed downward up to 18mm in the concrete slug.

Keywords

References

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