Title: Management of Nuclear Plant Operation by Optimising Weld Repairs - Enpower Project Overview
Authors: BOUCHARD P. JohnBROWN T. BruceDAUDA Tamba A.HEIN HieronymusLAWRJANIEC DidierSMITH David J.TRUMAN Chris E.OHMS CARSTENSMITH Mike C.YOUTSOS AnastasiusCARDAMONE David
Other Contributors: BOUCHER Christian
Citation: Proceedings of the 2005 ASME Pressure Vessels and Piping Conference, Denver, vol. PVP2005-71771 p. 1-6
Publisher: ASME (American Society of Mechanical Engineers)
Publication Year: 2005
JRC Publication N°: JRC32468
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC32468
Type: Contributions to Conferences
Abstract: ENPOWER is a EURATOM collaborative research project sponsored by the European Union. The aim is to produce advanced weld repair techniques and residual stress mitigation procedures for nuclear components in order to eliminate the need for expensive global Post-Weld Heat Treatment (PWHT). These procedures are based on weld repair optimisation combined with novel Alternative Post Weld Treatments (APWT). Repair procedures have been developed by carrying out parametric numerical studies for various repair and component configurations. APWTs are based on local heating at moderate temperatures (300 - 600 C) to produce local plasticity that redistributes the internal stresses and results in compression in the areas of interest. Two techniques have been identified as prime candidates: namely hot compression and thermal shock techniques. In combination with internal pressure the hot compression technique reveals itself to be very efficient and of most general use. The thermal shock method is effective for repairs in sections up to 25mm thick. The APWTs were established using numerical models applied to mock-up nuclear components, and validated by measurements. Numerical modelling methods have also been used to study the interactions between residual stresses, post weld treatments, op
JRC Institute:Institute for Energy and Transport

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