Author: D. W. Shoesmith

Publisher:

Published: 1994

Total Pages: 0

ISBN-13:

Candidate materials for reactor components of candu primary water systems were corrosion tested in pressurized water at 66 degrees c, 149 degrees c and 293 degrees c for periods of about 12 months. phase iv (ph 10 lioh, approximately 200 ppb o2) was complementary to phase i (ph 10 lioh, less than 5 ppb o2), and with the object of identifying any changes in material corrosion performance subsequent to the possibility of a small ingress of air into the candu-phwr primary water system. dissolved oxygen instigated heavy localized corrosion attack on carbon steel and the low alloy steels, particularly at the lower temperatures of exposure. this localized attack on carbon steel was more apparent in lithiated water than in ammoniated water. in high temperature (293 degrees c) water the presence of dissolved oxygen was beneficial to the uniform corrosion resistance of both carbon steel and stainless steels. dissolved oxygen was deleterious to the corrosion performance of monel 400, chromium based surfaces, sn-bronzes and to some extent 17-4 ph steel and nitrided steel surfaces. after long cumulative exposures to high temperature water there was no evidence of stress corrosion cracking in 17-4 ph (h1050) steel, carpenter custom 455 (h1000) steel, titanium alloys and ni-cr-fe alloy steam generator tubing. cracking was observed, however, in cu-be roll pins and in the carpenter custom 455 (h900) steel.