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Development of Technical Guidelines
Material Sciences of Metallic Structures of Stress Corrosion Cracking in Nuclear Power Plant
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A consultants meeting to prepare a new technical report Guidelines on material sciences of metallic structures for IGSCC and IASCC was organized on 24−27 September 2007 at Vienna, Austria. Thirteen experts from Brazil, Germany, Japan, Rep. of Korea, Spain, Sweden, Switzerland, United States of America, and OECD-NEA attended to prepare a draft version of the IAEA-TECDOC.
Stress corrosion cracking (SCC) is the term given to crack initiation and sub-critical crack growth of susceptible alloys under the influence of tensile stress and a corrosive environment. SCC is a complex phenomenon driven by the synergistic interaction of mechanical, electrochemical and metallurgical factors. SCC can proceed through a material in either of two modes: intergranular (along the grain boundaries) or transgranular through the grains. Sometimes the modes are mixed or the mode switches from one mode to the other.
The objective of this report is to provide general descriptions of damage mechanisms for different types systems, structures and components in light water reactors and information on good practices for preventing, mitigating and repairing SCC damages as well as information on related international/national R&D programmes. Operational experience and practices in Member States are also presented in the report.
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Table of Contents
- Introduction
- Mechanism and major contributors of stress corrosion cracking
- Operating experience
- Inspection
- Assessment and flaw analysis
- Mitigation and repair methods
- Component replacement including prevention methods for new systems and components
- International/national research activities to manage SCC
- Summary to manage SCC