Speciation and chemical activities in superheated sodium borate solutions. Final report
- Sonoma Research Co., Vineburg, CA (US)
The system H{sub 2}O-B{sub 2}O{sub 3}-Na{sub 2}O has been studied experimentally at 277{degrees} and 317{degrees}C. The activities of water and boric acid have been determined at mole ratios Na/B from 0 to 1.5, and total dissolved solids 3 to 80 weight percent. The activity of boric acid has been fitted to within experimental error using a speciation model with eight complex species. This model is consistent with the model previously published by Mesmer et al. The electrolyte properties of the liquid are modelled using the Pitzer-Simonson Model of very concentrated electrolyte solutions. The calculated values of water activity agree with experiment, and the activity of NaOH and pOH have also been calculated. These data will allow prediction of the composition and chemical behavior of sodium borate liquids that may accumulate in the superheated crevices within a steam generator. A modified form of the model is provided for use with MULTEQ. The potassium borate system also was briefly studied at 317{degrees}C, and is adequately described by a model with five complex species. The potassium borate liquid is more alkaline at K/B = 1 than a sodium borate liquid at the same mole ratio, but pOH in the two systems is the same at lower mole ratios.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Sonoma Research Co., Vineburg, CA (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 10169720
- Report Number(s):
- EPRI-TR-102491; ON: UN93016919; TRN: 93:001979
- Resource Relation:
- Other Information: PBD: Jun 1993
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
SODIUM BORIDES
SUPERHEATING
STEAM GENERATORS
RELIABILITY
CORROSION PROTECTION
INCONEL ALLOYS
CORROSION FATIGUE
PWR TYPE REACTORS
WATER CHEMISTRY
NUCLEAR POWER PLANTS
OCCUPATIONAL EXPOSURE
CORROSION INHIBITORS
BORIC ACID
M CODES
COMPUTERIZED SIMULATION
210200
360105
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
NONBOILING WATER COOLED
CORROSION AND EROSION