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All NORAD shelters all have a “non-catastrophic” failure mode.

“All the failures are divided in catastrophic ones, i.e., endangering people and/or environment and/or resulting into a considerable economical loss, and non-catastrophic failures.”1

1MECHANICAL ENGINEERING, ENERGY SYSTEMS AND SUSTAINABLE DEVELOPMENT -Volume I
edited by Konstantin V. Frolov, Oleg N. Favorsky, R.A. Chaplin and Christos Frangopoulos
Eolss Publishers Co. Ltd., Oxford, UK Copyright 2009 EOLSS Publishers /UNESCO