Caustic concentration in tube support plate crevices of steam generators: Topical report
The hideout of sodium hydroxide, sodium chloride and sodium carbonate was studied in a single tube model boiler at Cadarache. Radioactive /sup 24/Na was used for the measurements in the drilled hole support plates. The crevices were empty or packed with magnetite or carbon fiber. Hideout increased with ppM-hours operation until the crevices were filled to a concentration of salt established by the available superheat and kinetic factors. As the gap in the crevice was reduced, the average concentration of caustic increased. Crevice solutions of 50% caustic were achieved after 700-1700 ppM-hours of operation with an available superheat (primary-secondary temperatures) of 65/sup 0/C (117/sup 0/F) in a 0.2 mm (8 mil) crevice packed with magnetite. Hideout return with no heat flux was shown to be an effective way to remove salts from the crevice.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); CEA Centre d'Etudes Nucleaires de Cadarache, 13 - Saint-Paul-lez-Durance (France)
- OSTI ID:
- 7054460
- Report Number(s):
- EPRI-NP-5073; ON: TI87920310
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
STEAM GENERATORS
CREVICE CORROSION
SODIUM 24
SODIUM CARBONATES
SODIUM CHLORIDES
SODIUM HYDROXIDES
SUPPORTS
TRACER TECHNIQUES
TUBES
ALKALI METAL COMPOUNDS
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOILERS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MECHANICAL STRUCTURES
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SODIUM COMPOUNDS
SODIUM ISOTOPES
VAPOR GENERATORS
220200* - Nuclear Reactor Technology- Components & Accessories
360105 - Metals & Alloys- Corrosion & Erosion