The use of mock-ups with implanted flaws (fatigue cracks) is now common practice in the nuclear power industry to confirm NDE operator qualifications and to verify capability of NDE procedures and techniques. This paper will identify and discuss both typical and unique applications where full-scale mock-ups with implanted flaws were used to demonstrate NDE capability and accuracy. A good example is the approaching implementation of Supplement 10 (Dissimilar Metal Welds) in the ASME, Appendix VIII requirements as this paper will provide a detailed discussion of the current methods used to implant flaws in both austenitic and ferritic piping materials. Several general categories of dissimilar metal (DM) applications used in a typical nuclear power plant will be addressed. Typical DM applications include Inconel safe-ends, CRDM's, cast stainless pipe, etc. The emphasis will be on the actual flaw (fatigue crack) implant procedures and the related tolerances for location, size and accuracy. There will also be a brief discussion of the different material types identified in the both BWR and PWR nuclear plants with a review of the typical dissimilar metal weld joint configurations.
Publication Source: 3nd International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, November 14-16, 2001, Seville Spain. Publisher: Tecnatom s.a. - [Homepage]
