Abstract
In order to investigate crack growth characteristics due to thermal striping in liquid sodium coolant used for fast breeder reactors (FBRs), thermal striping tests in sodium have been conducted using Type 304 stainless steel and its plasma carburized materials. The results showed that the threshold stress intensity facto:r range, derived from a thermal stress analysis under the condition of plane stress, could predict the final lengths of the nonpropagating cracks. The depths of nonpropagating cracks increased with increase of carbon content. This tendency was attributed to the difference of the stress intensity factor range, caused by the different Young's moduli of the materials.
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