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

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 H{sub 3}BO{sub 3}. At 300 deg. C the LiOH concentrations higher than 10{sup -2} M (roughly 70 ppm of Li{sup +}) 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,  More>>
Authors:
Saario, T; Taehtinen, S [1] 
  1. Technical Research Centre of Finland, Espoo (Finland)
Publication Date:
Feb 01, 1997
Product Type:
Conference
Report Number:
IAEA-TECDOC-927; CONF-9310467-
Reference Number:
SCA: 210200; PA: AIX-28:034569; EDB-97:060658; SN: 97001775145
Resource Relation:
Conference: Technical committee meeting on influence of water chemistry on fuel cladding behaviour, Rez (Czech Republic), 4-8 Oct 1993; Other Information: PBD: Feb 1997; Related Information: Is Part Of Influence of water chemistry on fuel cladding behaviour. Proceedings of a technical committee meeting; PB: 499 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; FILMS; STABILITY; CORROSION; CRACKING; ELECTRIC CONDUCTIVITY; PWR TYPE REACTORS; WATER CHEMISTRY; ZIRCALOY 2
OSTI ID:
462439
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1011-4289; Other: ON: DE97622401; TRN: XA9743692034569
Availability:
INIS; OSTI as DE97622401
Submitting Site:
INIS
Size:
pp. 207-226
Announcement Date:
May 08, 1997

Citation Formats

Saario, T, and Taehtinen, S. In situ measurement of the effect of LiOH on the stability of zircaloy-2 surface film in PWR water. IAEA: N. p., 1997. Web.
Saario, T, & Taehtinen, S. In situ measurement of the effect of LiOH on the stability of zircaloy-2 surface film in PWR water. IAEA.
Saario, T, and Taehtinen, S. 1997. "In situ measurement of the effect of LiOH on the stability of zircaloy-2 surface film in PWR water." IAEA.
@misc{etde_462439,
title = {In situ measurement of the effect of LiOH on the stability of zircaloy-2 surface film in PWR water}
author = {Saario, T, and Taehtinen, S}
abstractNote = {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 H{sub 3}BO{sub 3}. At 300 deg. C the LiOH concentrations higher than 10{sup -2} M (roughly 70 ppm of Li{sup +}) 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. (author).}
place = {IAEA}
year = {1997}
month = {Feb}
}