Environmentally assisted cracking in light water reactors
Topics that have been investigated during this year include (1) SCC of A533-Gr B steel used in steam generator and reactor pressure vessels, (2) fatigue of Type 316NG SS, and (3) SCC of Type 347 and CF-3 cast duplex stainless steels in simulated BWR water. Crack-growth-rate (CGR) tests were performed on a composite A533-Gr B/Inconel-182 specimen in which the stress corrosion crack in the Inconel-182 weld metal penetrated and grew into the A533-Gr B steel. CGR tests were also conducted on conventional (unplated) and nickel- or gold-plated A533-Gr B specimens to provide insight into whether the nature of the surface layer on the low-alloy steel, either oxide corrosion products or a noble metal, influences the overall SCC process. CGR data on the A533-Gr B specimens were compared with the fatigue crack reference curves in the ASME Boiler and Pressure Vessel Code, Section XI, Appendix A. Fatigue tests were conducted on Type 316NG SS in air and simulated BWR water at low strain ranges and frequencies to better establish margins in the ASME Code Section III Fatigue Design Curves. CGR tests were also conducted on specimens of Type 347 SS with different heat-treatment conditions, and a specimen of CF-3 cast stainless steel with a ferrite content of 15.6%. The results were compared with previous data on another heat of Type 347 SS, which was very resistant to SCC, and a CF-3M steel with a ferrite content of 5%. 37 refs., 15 figs., 8 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- NRC; Nuclear Regulatory Commission, Washington, DC (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5958169
- Report Number(s):
- ANL/CP-70988; CONF-9010185--28; ON: DE91011167
- Country of Publication:
- United States
- Language:
- English
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Environmentally assisted cracking in light water reactors
Environmentally assisted cracking in light water reactors. Semiannual report, April--September 1991: Volume 13
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360106 -- Metals & Alloys-- Radiation Effects
ALLOYS
BOILERS
BWR TYPE REACTORS
CHEMICAL REACTIONS
CHEMISTRY
CONTAINERS
CORROSION
CRACK PROPAGATION
CRACKS
FATIGUE
FRACTURE MECHANICS
FRACTURE PROPERTIES
HEAT TREATMENTS
HIGH ALLOY STEELS
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MECHANICS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PIPES
PRESSURE VESSELS
PWR TYPE REACTORS
REACTORS
STAINLESS STEELS
STEAM GENERATORS
STEELS
STRESS CORROSION
VAPOR GENERATORS
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS