Effect of Poorly Uniform Thickness and Surface Defects on Burst Test Results of Fuel Cladding Tubes

概要

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A study was undertaken to evaluate and determine "an acceptable defect level" of fuel cladding tubes for light water reactor. The burst strengths of both zircaloy-2 and AISI 304 L stainless steel tube were evaluated by burst testing naturally or artificially defected tube samples. <BR>As a result, (1) the burst strength of zircaloy-2 tube with poorly uniform thickness is affected by the minimum thickness of the tube, (2) a deep natural defect on the wall of the tube generally impairs the burst pressure value more than an artificially-made defect of the same extent as determined by non-destructive test; (3) artificial defects of depths up to 30% of the wall thickness do not cause appreciable deterioration of burst strength.
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