Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Denting of Inconel steam generator tubes in pressurized water reactors. Final report

Technical Report ·
DOI:https://doi.org/10.2172/5018188· OSTI ID:5018188
;
Denting is a form of damage that results from the rapid, linear growth of magnetite on carbon steel tube support plates in tube-to-support plate crevices. The pressure of the corrosion products distorts the tubes as well as the support plates. Although denting was first thought to be confined to those recirculating steam generators that had been converted from phosphate to AVT, it has now also been observed in plants still on phosphate, as well as in some that started on AVT. In some units, slightly abnormal eddy current signals have been observed at the top of tube sheets. No denting has been observed so far in the B and W once-through steam generators. In all, some 14 plants are affected. Inconel 600 tube defects and leaks were first observed at Surry and Turkey Point, which were severely dented. The cracks originated from the primary side, and were found to be caused by primary side stress corrosion cracking of highly strained tubing. Some minor leaks have subsequently occurred in a few other steam generators. Suggestions are included of work to elucidate the quantitative aspects of stress corrosion cracking.
Research Organization:
Brookhaven National Lab., Upton, N.Y. (USA)
DOE Contract Number:
EY-76-C-02-0016
OSTI ID:
5018188
Report Number(s):
BNL-NUREG-50778
Country of Publication:
United States
Language:
English

Similar Records

Denting of Inconel 600 steam generator tubes in pressurized water reactors
Technical Report · Fri Oct 01 00:00:00 EDT 1976 · OSTI ID:7247027
Denting of Inconel steam generator tubes in pressurized water reactors. Third informal report
Technical Report · Mon Aug 01 00:00:00 EDT 1977 · OSTI ID:6812195
Stress analysis of pressurized water reactor steam generator tube denting phenomena. Interim report
Technical Report · Sat Jul 01 00:00:00 EDT 1978 · OSTI ID:6803020

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
DEFORMATION
INCONEL 600
INCONEL ALLOYS
IRON ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PERFORMANCE
PWR TYPE REACTORS
REACTORS
STEAM GENERATORS
TUBES
VAPOR GENERATORS
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS