Solubility of nonstoichiometric nickel ferrite in high-temperature aqueous solution. [PWR]
Journal Article
·
· Nucl. Sci. Eng.; (United States)
OSTI ID:5356694
The solubility of nickel ferrite as a model substance for deposits forming on the cladding of nuclear fuel elements of pressurized water reactors is determined in aqueous solutions of primary coolant composition at different pH and hydrogen concentrations, in the temperature region from 230 to 330/sup 0/C. The temperature coefficient of solubility changes from negative to positive at about pH 7 with increasing pH. The data agree reasonably well with those of Sweeton and Baes for magnetite, considering the lower iron activity in the nickel ferrite. The solubility of nickel is generally lower than that which corresponds to a congruent solution and goes through a minimum near pH 7.4. The iron solubility appears to depend on the one-third power of the hydrogen concentration in solution in the region from 20 to 100 cm/sup 3/H/sub 2//kg H/sub 2/O, as expected. Preliminary results, however, indicate that at lower hydrogen concentrations, the dependence on the hydrogen concentration can decrease, possibly due to the formation of cation vacancies.
- Research Organization:
- Westinghouse Research and Development Center, Pittsburgh
- OSTI ID:
- 5356694
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 64:4; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
CORROSION PRODUCTS
DEPOSITION
FERRIMAGNETIC MATERIALS
FERRITES
FUEL CANS
HIGH TEMPERATURE
IRON COMPOUNDS
MAGNETIC MATERIALS
NICKEL COMPOUNDS
OXYGEN COMPOUNDS
PWR TYPE REACTORS
REACTORS
SOLUBILITY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
CORROSION PRODUCTS
DEPOSITION
FERRIMAGNETIC MATERIALS
FERRITES
FUEL CANS
HIGH TEMPERATURE
IRON COMPOUNDS
MAGNETIC MATERIALS
NICKEL COMPOUNDS
OXYGEN COMPOUNDS
PWR TYPE REACTORS
REACTORS
SOLUBILITY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
WATER COOLED REACTORS
WATER MODERATED REACTORS