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- W51164364 abstract "A continuing analysis of the PTS problem associated with PWR postuated OCA's indicates that the previously accepted degree of conservatism in the fracture-mechanics model needs to be more closely evaluated, and if excessive, reducted. One feature that was believed to be conservative was the use of two-dimensional as opposed to finite-length (three-dimensional) flaws. A flaw of particular interest is one that is located in an axial weld of a plate-type vessel. For those vessels that suffer relatively high radiation damage in the welds, the length of the flaw will be no greater than the length of the weld, and recent calculations indicate that a deep flaw of that length (approx. 2 m) is not effectively infinitely long, contrary to previous thinking. The benefit to be derived from consideration of the 2-m flaw and also a semielliptical flaw with a length-to-depth ratio of 6/1 was investigated by analyzing several postulated transients. In doing so the sensitivity of the benefit to a specified maximum crack arrest toughness and to the duration of the transient was investigated. Results of the analysis indicate that for some conditions the benefit in using the 2-m flaw is substantial, but it decreases with increasing pressure, and abovemore » a certain pressure there may be no benefit, depending on the duration of the transient and the limit on crack arrest toughness.« less" @default.
- W51164364 created "2016-06-24" @default.
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- W51164364 date "1983-01-01" @default.
- W51164364 modified "2023-10-16" @default.
- W51164364 title "Reassessment of PWR pressure-vessel integrity during overcooling accidents" @default.
- W51164364 hasPublicationYear "1983" @default.
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