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Title: Neutralization of steam generator denting. Volume 2. Final report. [PWR]

This report deals with experimental laboratory work, the purpose of which was to reproduce the denting phenomenon observed in some steam generator heat transfer tubing and then to determine the effectiveness of selected candidate additives with regard to their ability to inhibit the denting phenomenon. Denting was shown to be dependent on a synergism between materials, oxidants, chloride, crevice geometry, superheats and temperature. A reference denting environment was developed and candidate inhibitors to this environment were subsequently added in an attempt to prevent and/or stop the denting process. Boric acid applications in a soak/on-line mode were found to be completely effective with no indications of deleterious side effects. Boric acid has been recommended for field application on a plant-specific basis. Calcium hydroxide and sodium phosphate additions in an on-line mode were effective inhibitors.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
5350251
Report Number(s):
EPRI-NP-3023-Vol.2
ON: DE84920040
Resource Type:
Technical Report
Research Org:
Westinghouse Electric Corp., Pittsburgh, PA (USA). Nuclear Technology Div.
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 36 MATERIALS SCIENCE; INCONEL 600; CORROSION DENTING; PWR TYPE REACTORS; STEAM GENERATORS; REACTOR MATERIALS; TUBES; BORIC ACID; CALCIUM HYDROXIDES; CORROSION INHIBITORS; PERFORMANCE TESTING; WATER CHEMISTRY; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BOILERS; CALCIUM COMPOUNDS; CHEMISTRY; CHROMIUM ALLOYS; DEFORMATION; HYDROGEN COMPOUNDS; HYDROXIDES; INCONEL ALLOYS; INORGANIC ACIDS; IRON ALLOYS; MATERIALS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIOBIUM ALLOYS; OXYGEN COMPOUNDS; REACTORS; TESTING; VAPOR GENERATORS; WATER COOLED REACTORS; WATER MODERATED REACTORS 210200* -- Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled; 360105 -- Metals & Alloys-- Corrosion & Erosion