Electrochemical Study of the Corrosion Processes of the Secondary Side of Steam Generators

Sala, B.; Chevalier, Sébastien; Gelpi, A.; Takenouti, H.; Keddam, M.

doi:10.1002/9781118787618.ch61

Cited by 1 publication

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nickel-based weld metals, such as Alloys 182 and 82, are also susceptible to PWSCC [32,33], as are higher strength precipitation-hardened alloys such as Alloy-X-750 [22]. A variety of mechanisms can cause secondary side cracking including caustic environments or acidic conditions, both of which may occur in crevice locations under certain conditions [34]. The higher chromium content Alloy 690 is much more resistant to PWSCC and most of the secondary side cracking mechanisms.…”

Section: Stress Corrosion Crackingmentioning

confidence: 99%

See 1 more Smart Citation

Contribution of research to the understanding and mitigation of environmentally assisted cracking in structural components of light water reactors

Tice

2017

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

Environmentally assisted cracking (EAC) is a potential threat to the safety and integrity of water-wetted components in operating water-cooled nuclear power plants. Two forms of EAC are commonly distinguished, depending on the form of loading contributing to damage: stress corrosion cracking (SCC) and corrosion fatigue. A number of instances of in-service degradation due to EAC have occurred in operating plants worldwide, often leading to unplanned plant outages. Understanding the causes of EAC is essential to minimise the loss of plant availability due to its occurrence and to avoid the possibility of catastrophic failure, for example, if a crack grew to a critical size in a major pressure boundary component. This paper will describe some examples of these phenomena in the main materials of construction of pressure boundary and other critical components in pressurised and boiling water reactors (BWRs). Over the last several decades, substantial research programmes have been carried out in a number of laboratories worldwide, aimed at further understanding of the processes leading to EAC to manage occurrences in plant and minimise future failures. Selected areas of research on EAC in light water reactor environments are discussed. Corrosion fatigue in low-alloy pressure vessel steels was the subject of considerable attention in the 1980s and early 1990s because of its potential threat to pressure vessel integrity and the publication of data, suggesting that there is a major influence of environment on fatigue crack growth in some laboratory tests. The author's research provided insight into the conditions under which the major environmental effects occur and contributed to the development of an ASME Code Case for pressurised water reactor (PWR) conditions which provided a means of screening based on steel sulphur content and loading conditions. More recently, the research focus in this area has moved to austenitic stainless steels, again providing support to Code Case development and furthering mechanistic understanding. A recent review of knowledge gaps for EPRI provides a basis for future research on environmentally assisted fatigue and will inform the development of new assessment methodologies. A key area of the current study concerns differences in loading conditions between specimens in laboratory tests and plant components subject to transient loading. In the case of SCC, stainless steels have shown the greatest propensity to cracking in BWRs, while Alloy 600 has been a major cause of in-service failures in PWRs, both on the primary side, as recognised by Coriou in the early 1960s, and in secondary environments where a number of different corrosionrelated failure processes have been identified. High-strength alloys, such as Alloy X-750 used for fastener applications, have also caused failures in both reactor types. For austenitic materials, SCC susceptibility is enhanced by irradiation, resulting in failures in core internals components. Ferritic stainless steels also undergo SCC under some specific circums...

show abstract

Section: Stress Corrosion Crackingmentioning

confidence: 99%

“…Some SCC failures of Alloy 600 have also occurred in BWRs which are usually attributed to thermal sensitisation. Further discussion of SCC of nickel-based alloys is outside the scope of the current paper; a useful overview is provided by Staehle and Gordon [34].…”

Section: Stress Corrosion Crackingmentioning

confidence: 99%

Contribution of research to the understanding and mitigation of environmentally assisted cracking in structural components of light water reactors

Tice

2017

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

show abstract

Electrochemical Study of the Corrosion Processes of the Secondary Side of Steam Generators

Cited by 1 publication

References 2 publications

Contribution of research to the understanding and mitigation of environmentally assisted cracking in structural components of light water reactors

Contribution of research to the understanding and mitigation of environmentally assisted cracking in structural components of light water reactors

Contact Info

Product

Resources

About