Corrosion evaluation of two processes for chemical decontamination of BWR structural materials
The effects of dilute chemical decontamination on the corrosion of boiling water reactor (BWR) materials were evaluated for two commercial decontamination processes, CAN-DECON LND-101A and LOMI. Laboratory coupons of three key BWR structural materials - sensitized Type 304 stainless steel, Inconel 600, and pressure vessel low alloy steel - were studied for both processes. Pipe welds with field CAN-DECON decontamination in operating BWR plants also evaluated. Decontaminated surface morphologies were examined to assess the corrosion phenomenon during decontamination processing, and stress corrosion cracking tests were conducted to assess the degradation of intergranular stress corrosion cracking (IGSCC) resistance in post-decontamination BWR service. It was found that deep intergranular attack (IGA), observed in the lightly prefilmed and heavily sensitized stainless steel laboratory CAN-DECON processed coupons, tended to enhance IGSCC in BWR water. However, shallow IGA and dense, shallow pits found in the very heavily prefilmed but somewhat less sensitized in-plant CAN-DECON processed pipe welds did not result in detrimental effects on IGSCC resistance as measured in constant extension rate tensile (CERT) test specimens from the pipe. The laboratory CAN-DECON process solvents contained less dissolved ferric ions than the in-plant process solvent. 13 refs., 43 figs.
- Research Organization:
- General Electric Co., San Jose, CA (USA). Nuclear System Technology Operation
- OSTI ID:
- 6198802
- Report Number(s):
- EPRI-NP-4356; ON: TI86920097
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210100 -- Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
BWR TYPE REACTORS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CLEANING
CORROSION
CORROSION RESISTANT ALLOYS
DECONTAMINATION
DOSES
EVALUATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 600
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
RADIATION DOSES
REACTOR COMPONENTS
REACTOR MATERIALS
REACTORS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS