The influence of ppb levels of chloride impurities on the strain-induced corrosion cracking and corrosion fatigue crack growth behavior of low-alloy steels under simulated boiling water reactor conditions. (July 2016)

• Record Type: Journal Article
• Authors: Seifert, H.P.; Ritter, S.
• Is Part Of: Corrosion science. Volume 108(2016)
• Page Start: 148
• Page End: 159
• Publication Date: 2016-07
• Subjects: AL action level of EPRI water chemistry guidelines -- ASTM American Society of Testing and Materials Standards -- ASTM E399 test method for plane-strain fracture toughness of metallic materials -- BWR boiling water reactor -- CF corrosion fatigue -- CL constant load -- CODLL crack opening displacement at load line -- C(T) compact tension specimen -- DCPD direct current potential drop crack length measurement method -- DH dissolved hydrogen (content) -- DO dissolved oxygen (content) -- DSA dynamic strain ageing -- EAC environmentally-assisted cracking -- ECP (Free)electrochemical corrosion potential -- ENSI Swiss Nuclear Safety Inspectorate, Switzerland -- EPRI Electric Power Research Institute -- F&A Ford & Andresen (EAC Model) -- FRAD film rupture anodic dissolution crack growth mechanism -- GE GR General Electric Global Research -- HAZ weld heat-affected zone -- HWC hydrogen water chemistry -- LWR light water reactor -- NWC normal water chemistry -- ppb parts per billion by weight, 1 ppb = 1 μg/kg -- ppm parts per million by weight, ppm = 1 mg/kg -- PSI Paul Scherrer Institut, Switzerland -- PWHT post-weld heat treatment -- PWR pressurized water reactor -- Q quenched -- R load ratio -- RPV reactor pressure vessel -- SCC stress corrosion cracking -- SEM scanning electron microscope -- SICC strain-induced corrosion cracking -- SHE standard hydrogen electrode -- SR stress-relieved -- SRL slow rising load test -- T tempered or temperature -- YS yield stress; Low-alloy steel -- Strain-induced corrosion cracking -- Corrosion fatigue -- Chloride -- Reactor conditions; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.03.010
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Chloride effects on strain-induced corrosion cracking and corrosion fatigue crack growth in RPV steels. ppb-levels of chloride increase strain-induced corrosion cracking initiation susceptibility in boiling water reactor environment. No effect of chloride on subsequent strain-induced corrosion crack growth in boiling water reactor environment. Acceleration of corrosion fatigue crack at intermediate corrosion potentials and low loading frequencies only. Abstract: The effect of chloride on the strain-induced corrosion cracking (SICC) and corrosion fatigue (CF) crack growth behaviour in low-alloy reactor pressure vessel steels was evaluated under simulated boiling water reactor normal water chemistry conditions by slow rising load and cyclic constant load amplitude tests with air fatigue pre-cracked fracture mechanics specimens. Chloride in the ppb level range increased the SICC initiation susceptibility, but had almost no effect on the subsequent SICC and CF crack growth. A strong effect of chloride addition of 100 ppb on CF crack growth was observed at intermediate corrosion potentials and very low loading frequencies only.