Abstract
The purpose of this paper is to present the experience from field summarize by the MULTIMETAL participants on the investigated dissimilar metal weld variants. The project started in February 2012 and ends in 2015. The project is coordinated by VTT with 10 partner organizations from Europe: AREVA
(SAS & GmbH), CEA, France, JRC, Belgium, EdF-Energy, UK, BZF, Hungary, EDF, France, TECNATOM, Spain, JSI, Slovenia, Studsvik Nuclear AB, Sweden. The aim of the project is to develop a standard for measuring the fracture resistance of multi-metallic specimen and development of harmonized procedures for dissimilar metal welds (DMWs) ductile integrity assessment. This is based on seven work packages, see Multimetal. The second work package of this project is dedicated to the summary of experiences gained in the DMWs investigation and is divided in four tasks: DMW basic information on design and field experience; State Of the Art in residual stress assessment; Overview on regulatory integrity assessment of DMWs including leak-before-break (LBB) and finally a State Of the Art in experimental procedures for mechanical and fracture toughness testing. This paper presents an overview of the main work performed for all four sub-tasks.
Relevant issues from field experience have been identified in order to bound the integrity investigation on a well-defined region for the main DMWs design variants. The second sub-task comprises the collection of all relevant data on residual stresses in dissimilar weld regions. The actual regulatory point of view, i.e. what is already codified for integrity assessment of DMWs (in piping) including Leak-before-break is covering the French codifications RCC-M and RSE-M, the German KTA Standards, the American ASME Code. Integrity assessment of flaws in welds requires substantial material data like fracture toughness values, which are evaluated according to standards that are not necessarily foreseen for the weld configuration in focus. The last task is focused on test procedures for material characterization tests dedicated to specimen from dissimilar metal weld component (mechanical behaviour as well as toughness
investigation) including specimen preparation This is a basis for further recommendation in WP6 (Best practice documents).
(SAS & GmbH), CEA, France, JRC, Belgium, EdF-Energy, UK, BZF, Hungary, EDF, France, TECNATOM, Spain, JSI, Slovenia, Studsvik Nuclear AB, Sweden. The aim of the project is to develop a standard for measuring the fracture resistance of multi-metallic specimen and development of harmonized procedures for dissimilar metal welds (DMWs) ductile integrity assessment. This is based on seven work packages, see Multimetal. The second work package of this project is dedicated to the summary of experiences gained in the DMWs investigation and is divided in four tasks: DMW basic information on design and field experience; State Of the Art in residual stress assessment; Overview on regulatory integrity assessment of DMWs including leak-before-break (LBB) and finally a State Of the Art in experimental procedures for mechanical and fracture toughness testing. This paper presents an overview of the main work performed for all four sub-tasks.
Relevant issues from field experience have been identified in order to bound the integrity investigation on a well-defined region for the main DMWs design variants. The second sub-task comprises the collection of all relevant data on residual stresses in dissimilar weld regions. The actual regulatory point of view, i.e. what is already codified for integrity assessment of DMWs (in piping) including Leak-before-break is covering the French codifications RCC-M and RSE-M, the German KTA Standards, the American ASME Code. Integrity assessment of flaws in welds requires substantial material data like fracture toughness values, which are evaluated according to standards that are not necessarily foreseen for the weld configuration in focus. The last task is focused on test procedures for material characterization tests dedicated to specimen from dissimilar metal weld component (mechanical behaviour as well as toughness
investigation) including specimen preparation This is a basis for further recommendation in WP6 (Best practice documents).
| Original language | English |
|---|---|
| Title of host publication | Structural Mechanics in Reactor Technologies |
| Subtitle of host publication | 23rd International Conference on Structural Mechanics in Reactor Technology 2015 (SMiRT 23) |
| Publisher | International Association for Structural Mechanics in Reactor Technology IASMiRT |
| Number of pages | 10 |
| ISBN (Print) | 978-1-5108-4344-8 |
| Publication status | Published - 2015 |
| MoE publication type | A4 Article in a conference publication |
| Event | 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22 - San Francisco, United States Duration: 18 Aug 2013 → 23 Aug 2013 Conference number: 23 |
Conference
| Conference | 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22 |
|---|---|
| Abbreviated title | SMiRT 22 |
| Country/Territory | United States |
| City | San Francisco |
| Period | 18/08/13 → 23/08/13 |