In situ measurement of the effect of LiOH on the stability of zircaloy 2 surface film in PWR water

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Surface films on the metals play a major role in corrosion assisted cracking. A new method called Contact Electric Resistance (CER) method has been recently developed for in situ measurement of the electric resistance of surface films in high temperature and high pressure environments. The technique has been used to determine in situ the electric resistance of films on metals when in contact with water and dissolved anions, during formation and destruction of oxides and hydrides and during electroplating of metals. Electric resistance data can be measured with a frequency of the order of one hertz, which makes it possible to investigate in situ the kinetics of surface film related processes which are dependent on the environment, temperature, pH and electrochemical potential. This paper presents the results of the CER investigation on the effects of LiOH on the stability of Zircaloy-2 surface film in water with 2000 ppm H3BO3. At 300°C the LiOH concentrations higher than 10-2 M (roughly 70 ppm of Li+) were found to markedly reduce the electric resistance of the Zircaloy-2 surface film during a test period of less than two hours. The decrease of the film resistance is very abrupt, possibly indicating a phase transformation. Moreover, the advantages of the CER technique over the other competing techniques which rely on the measurement of current are discussed.
Original languageEnglish
Title of host publicationInfluence of water chemistry on fuel cladding behaviour
Subtitle of host publicationProceedings of a technical committee meeting
Place of PublicationVienna
PublisherInternational Atomic Energy Agency IAEA
Pages207-226
Publication statusPublished - 1993
MoE publication typeA4 Article in a conference publication
EventIAEA Technical Committee Meeting on Influence of Water Chemistry on Fuel Cladding Behaviour - Rěž, Czech Republic
Duration: 4 Oct 19938 Oct 1993

Publication series

SeriesIAEA Technical Documents
NumberIAEA-TECDOC--927
ISSN1011-4289

Conference

ConferenceIAEA Technical Committee Meeting on Influence of Water Chemistry on Fuel Cladding Behaviour
CountryCzech Republic
CityRěž
Period4/10/938/10/93

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    Saario, T., & Tähtinen, S. (1993). In situ measurement of the effect of LiOH on the stability of zircaloy 2 surface film in PWR water. In Influence of water chemistry on fuel cladding behaviour: Proceedings of a technical committee meeting (pp. 207-226). International Atomic Energy Agency IAEA. IAEA Technical Documents, No. IAEA-TECDOC--927