Paper Title:
Dominant Factor for the Occurrence of a Steam Explosion
  Abstract

For the study of a steam explosion phenomenon in a nuclear reactor, prototypic corium, a mixture of UO2 and ZrO2 was melted in a cold crucible by applying an induction heating technique. The molten corium was then poured into cold water. It was fragmented into very small particles, so called debris, which enables a very rapid heat transfer to the water. Some cases led to steam explosions by thermal expansion of the water. After the tests, all the debris particles were dried and classified by their size. From the analysis by using EPMA, it was shown that the particles generated by a steam explosion had fine and irregular forms. It is known that real corium (including UO2) hardly leads to a steam explosion, different from pure ZrO2 or metal. A reason for this was previously suggested in that the corium generated hydrogen gas during melt-water interaction, and it enclosed the melt drops to prevent a direct contact of the corium and water. In order to confirm this fact, the debris particles were analyzed with ICP-AES for their typical element contents, EPMA for the homogeneity of the solid solution, XRD for the chemical compounds, and TGA and hydrogen reduction analysis for the percentage of the debris oxidation and reduction. These analyses showed that hydrogen was not directly related to steam explosion. Meanwhile, the material characteristics of the corium compositions are newly suggested to be the most probable reason for the occurrence of a steam explosion so far.

  Info
Periodical
Defect and Diffusion Forum (Volumes 273-276)
Edited by
Andreas Öchsner and Graeme E. Murch
Pages
388-393
DOI
10.4028/www.scientific.net/DDF.273-276.388
Citation
B.T. Min, S.W. Hong, J.H. Kim, I.K. Park, H.D. Kim, "Dominant Factor for the Occurrence of a Steam Explosion", Defect and Diffusion Forum, Vols. 273-276, pp. 388-393, 2008
Online since
February 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Kyoung Hoon Kim
Chapter 11: Environmentally Sustainable Manufacturing Processes and Systems
Abstract:The water and steam injection gas-turbine systems are comparatively investigated. Thermodynamic performances of the regenerative...
2109
Authors: Jun Li Liu, Jian Chun Jiang, Wei Hong Yang
Chapter 9: Energy Chemical Engineering
Abstract:Caragana is an abundant plant as the feedstock of biomass energy in China. In this study, pyrolysis of Caragana in the presence of high...
2152
Authors: Jun Feng Xu, Jian Ping Ye
Chapter 3: Materials Processing Technology and Mining Engineering
Abstract:The heat-transfer tubes and tube-sheets are the most complicated pressure parts in PWR steam generator. For analyzing the stress of...
421
Authors: Wei Cai, Yan Zhang, Peng Wei Li, Qing Fen Ma
Chapter 1: Environmental Chemistry, Chemical Manufacturing, Technologies and Engineering
Abstract:People’s demand for water resource is increasing continuously at this moment. People should desalt seawater based on pressure-gas...
92