Behavior of a Nuclear Steel Containment Equipment Hatch at Large Strain

[+] Author and Article Information
F. Fanous, L. Greimann

Civil Engineering Department, Iowa State University, Ames, Iowa 50011

J. Pressure Vessel Technol 110(2), 199-204 (May 01, 1988) (6 pages) doi:10.1115/1.3265587 History: Received December 08, 1987; Online November 05, 2009


During a severe accident, buckling of a steel containment hatch door, large deformation and ovaling of the hatch sleeve are potential causes of mismatch at the sealing surface which can result in a leakage path. A three-dimensional nonlinear finite element analysis of a typical steel containment/sleeve/hatch assembly that includes containment stiffeners, pretensioned swing bolts, and hatch door geometric imperfection is presented. The analysis was carried out to the nonlinear range up to large strains. The results indicated that the buckling load occurs at pressure, far above that which causes gross yielding of the shell plate. Although buckling of the hatch door increased the relative motions of the hatch sleeve and the hatch door, the motions remained sufficiently small to prevent leakage.

Copyright © 1988 by ASME
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