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Science and Technology of Nuclear Installations
Volume 2012, Article ID 646327, 25 pages
Research Article

Preliminary Assessment of the Possible BWR Core/Vessel Damage States for Fukushima Daiichi Station Blackout Scenarios Using RELAP/SCDAPSIM

1Innovative Systems Software, 1242 South Woodruff Avenue, Idaho Falls, ID 83404, USA
2ENCONET, Miramarska 20, 10000 Zagreb, Croatia
3ETSEIB, Universitat Politècnica de Catalunya, Avenida Diagonal 647, 08028 Barcelona, Spain
4Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan 779, Cuarto piso, Colonia Vertiz Narvarte, Delegacion Benito Juarez, 03020 Ciudad de México, DF, Mexico

Received 11 January 2012; Accepted 6 March 2012

Academic Editor: Alejandro Nuñez-Carrera

Copyright © 2012 C. M. Allison et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Immediately after the accident at Fukushima Daiichi, Innovative Systems Software and other members of the international SCDAP Development and Training Program started an assessment of the possible core/vessel damage states of the Fukushima Daiichi Units 1–3. The assessment included a brief review of relevant severe accident experiments and a series of detailed calculations using RELAP/SCDAPSIM. The calculations used a detailed RELAP/SCDAPSIM model of the Laguna Verde BWR vessel and related reactor cooling systems. The Laguna Verde models were provided by the Comision Nacional de Seguridad Nuclear y Salvaguardias, the Mexican nuclear regulatory authority. The initial assessment was originally presented to the International Atomic Energy Agency on March 21 to support their emergency response team and later to our Japanese members to support their Fukushima Daiichi specific analysis and model development.