Development of Advanced In-Situ Techniques for Chemistry Monitoring and Corrosion Mitigation in SCWO Environments
This project is developing sensing technologies and corrosion monitoring techniques for use in super critical water oxidation (SCWO) systems to reduce the volume of mixed low-level nuclear waste by oxidizing organic components in a closed cycle system where CO2 and other gaseous oxides are produced, leaving the radioactive elements concentrated in ash. The technique uses water at supercritical temperatures under highly oxidized conditions by maintaining a high fugacity of molecular oxygen in the system, which causes high corrosion rates of even the most corrosive resistant reactor materials. This project significantly addresses the high corrosion shortcoming through development of (a) advanced electrodes and sensors for in situ potentiometric monitoring of pH in high subcritical and supercritical aqueous solutions, (b) an approach for evaluating the association constants for 1-1 aqueous electrolytes using a flow-through electrochemical thermocell; (c) an electrochemical noise sensor for the in situ measurement of corrosion rate in subcritical and supercritical aqueous systems; (d) a model for estimating the effect of pressure on reaction rates, including corrosion reactions, in high subcritical and supercritical aqueous systems. The project achieved all objectives, except for installing some of the sensors into a fully operating SCWO system.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- FG07-96ER62303
- OSTI ID:
- 781020
- Report Number(s):
- DOE/ER/62303; Project Number 55171; Project Number 55171; TRN: US0102810
- Resource Relation:
- Other Information: PBD: 31 Mar 2000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
CORROSION PROTECTION
ON-LINE MEASUREMENT SYSTEMS
MONITORING
LOW-LEVEL RADIOACTIVE WASTES
CHEMICAL REACTION KINETICS
OXIDATION
SUPERCRITICAL GAS EXTRACTION
ORGANIC COMPOUNDS
RADIOACTIVE WASTE PROCESSING
MATHEMATICAL MODELS
SENSING
CORROSION MONITORING
SUPER CRITICAL WATER OXIDATION (SCWO)
VOLUME REDUCTION
CORROSION RATES
POTENTIOMETRIC MONITORING
ELECTROCHEMICAL NOISE SENSOR