Non-destructive testing of materials subject to atmospheric stress corrosion cracking

Abstract

In-service inspection revealed atmospheric stress corrosion cracking (ASCC), on 304L stainless steel piping. The method requiring inspection qualification was a surface method, namely Penetrant Testing as physical dimensions of the smallest flaw requiring detection by PT was ill defined for both pitting and cracking defects. Qualification was considered in terms of flaw volume together with absolute flaw linear dimensions. Inspection qualification would therefore determine the adequacy of the applied technique by both physical reasoning and by empirical measurement to determine the largest flaw that could escape detection.

Chloride-Induced Stress Corrosion Cracking of Austenitic Stainless Steel Used for Dry Storage of Spent Nuclear Fuel

“…The reported sources of chlorides have included de-icing salts from nearby highways as well as atmospheric salts. [1][2][3][4][5][6] In some cases high humidity sources were present, including cooling tower water. SNF dry cask storage system (DCSS) canisters may be subject to similar environmental conditions.…”

Development Time in Liquid Penetration Testing for Metal Butt Joint

“…Liquid penetration operations are influenced by several input variables, of which penetration dwell time and developer dwell time are the most factor highlight in the standard liquid penetration testing. Penetration dwell time is critical [3]. Penetration dwell time is a process involved waiting a period of time to ensure sufficient time allows penetrant drain and enters into flaw [4].Accessible that enough volume of penetrant is important to satisfy defect indication [5].The practice procedure for liquid penetrant testing was applied eleven steps of processes.…”