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Heat Removal Capability of Core-Catcher With Natural Circulation

[+] Author Affiliations
Tomohisa Kurita, Toshimi Tobimatsu, Mika Tahara, Kazuyoshi Aoki, Yoshihiro Kojima

Toshiba Corporation, Yokohama, Kanagawa, Japan

Paper No. ICONE21-16635, pp. V006T15A020; 7 pages
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 6: Beyond Design Basis Events; Student Paper Competition
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5583-6
  • Copyright © 2013 by ASME


Toshiba has developed a core-catcher system. It is to be installed at the bottom of the lower drywell in order to stabilize a molten core flowing down from a reactor vessel. It consists of a round basin made up of inclined cooling channels arranged axisymmetrically, and the structure including risers, downcomers and a water chamber to get natural circulation of the flooding water. So it can cover entire pedestal floor and can work in passive manner.

In order to confirm the heat removal capability of the core catcher with natural circulation, we have conducted full scaled tests in several conditions. Some important dimensionless numbers obtained from fundamental equations of the natural circulation are used for the tests.

Using dimensionless number and to compare with several analysis, we can verify that the experiment is adequate to simulate the actual plant.

Copyright © 2013 by ASME
Topics: Heat



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