Abstract
A very simple analysis gives an upper bound to the restraining effect of the austenitic cladding on the stress intensity for the extension, at the deepest point, of a three-dimensional under-clad crack into the wall of a water-cooled nuclear reactor pressure vessel during a hypothetical overcooling accident. By comparing the upper bound results with results for a two-dimensional crack, it is concluded that cladding restraint is unlikely to provide a significant reduction in the stress intensity at the deepest point. This viewpoint is confirmed by additional results for a special case, namely that of a semi-circular under-clad crack.
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