Scientific paradigms of structural safety of aged plants—Lessons learned from Russian activities

Saji, Genn; Timofeev, B. T.

doi:10.1016/j.nucengdes.2008.06.006

Cited by 7 publications

(1 citation statement)

References 32 publications

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“…This is a companion paper of the author's study on component degradation of aged plants also presented at this conference [42]. A portion of this work has been performed when the author was a Technical Counselor of Nuclear Safety Commission (NSC) of Japan; however the views described here represent those of author and do not in any way represent those of the NSC.…”

Section: Acknowledgementsmentioning

confidence: 99%

Icone15-10559 Degradation of Aged Plants by Corrosion : "Long-Cell Action" in Unresolved Corrosion Issues

Saji¹

2007

ICONE

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In a series of previous papers already published (including icone14-89350, 89651, icone12-49432, and 49433), the author has identified that 'long cell action' corrosion plays a pivotal role in practically all unresolved corrosion issues for all types of nuclear power plants (e.g. PWR/VVER, BWR/RBMK and CANDU). Some of these unresolved issues are IGSCC, PWSCC, AOA, FAC (erosion-corrosion) and various corrosion issues in steam generators and steam turbines.In conventional corrosion science it is well established that 'long cell action' can seriously accelerate or suppress the local cell corrosion activities. Although long cell action is another fundamental mechanism of corrosion, especially in an underground corrosion (also called 'soil corrosion') arena, potential involvement of this corrosion process has never been studied for the nuclear and fossil power plants as far as the author has been able to establish. The author believes that the omission of this basic corrosion mechanism is the root cause of practically all unresolved corrosion issues for light water reactor plants worldwide.In this paper, the author further deployed this assessment, without going into details about electrochemistry, to other key corrosion issues, e.g. steam generator and turbine corrosion issues, while briefly summarizing previous discussions for completeness, as well as introducing additional experimental and theoretical evidence of this basic corrosion mechanism. Due to the importance of this potential mechanism the author is calling for institutional review activities and further verification experiments as a joint international project.

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Section: Acknowledgementsmentioning

confidence: 99%