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Analysis of Early Stage Accident at TEPCO’s Fukushima Daiichi NPS

[+] Author Affiliations
Hiroshi Ono, Hideo Konishi

Japan Nuclear Energy Safety Organization, Tokyo, Japan

Paper No. ICONE21-16897, pp. V006T15A027; 8 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


The operation of the Isolation Condenser (IC) played an important role in the progression of the accident at the unit 1 of Fukushima Daiichi nuclear power station. Analyses of Unit 1 accident in the early stage (prior to the occurrence of core melt) were performed using plant dynamics analysis code RELAP5/MOD31 and the results were compared with measured data. In the RELAP5 code, analysis scope of target is not a severe accident. But, the detailed simulation in the early stage of accident including the plant control system behavior is possible. Moreover, some sensitivity analyses were conducted and the reactor behavior under IC operations was examined.

Copyright © 2013 by ASME
Topics: Accidents



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