کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
791018 | 1466137 | 2007 | 9 صفحه PDF | دانلود رایگان |

This paper reviews recent data that have come available on flaws in nuclear components. It examines whether the conclusions in a previous paper [Bullough R, et al. The probability of “large” defects in thick section butt welds in nuclear components. Int J Pressure Vessels Piping 2001; 78: 553–65] still hold in the light of this new information.A new model for estimating the distribution of flaws greater than 15 mm in through-wall extent for submerged arc welds is also reviewed. In this model, four potential flaw formation mechanisms are considered: (i) lack of fusion, (ii) weld metal solidification cracking, (iii) hydrogen-induced cracking in the heat-affected zone, and (iv) hydrogen-induced cracking in the weld metal. The distribution of large flaws remaining after pre-service inspection is calculated for each mechanism as the product of the probability of forming the flaw and the probability of the flaw being undetected during pre-service radiography. The assumptions and general applicability of the model are discussed.
Journal: International Journal of Pressure Vessels and Piping - Volume 84, Issue 12, December 2007, Pages 730–738