Underclad cracking of pressure vessel steels for light-water reactors
Although fracture mechanics analyses have shown that underclad cracks have no detrimental effect on the integrity of thick walled pressure vessels (40 year service), in order to avoid unexpected failures the US Nuclear Regulatory Commission has issued Regulatory Guide 1.43 which sets limits on the extent of fissures permitted and describes acceptable means of controlling the weld cladding processes. Cavitation and intergranular fissuring in SA508-2 and 22NiMoCr37 steels can occur in the presence or absence of intergranular particles. The observations of intergranular fissuring and cavitation in those HAZ free from overlapping effects are attributed to grain boundary segregation. Other probable void nucleation sites are the grain boundary-lath interface intersections which facilitate the formation of grain boundary discontinuities.
- Research Organization:
- Saltillo Institute of Technology, Apdo. 84-C Saltillo, Coah
- OSTI ID:
- 5980322
- Journal Information:
- Scr. Metall.; (United States), Vol. 21:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
PRESSURE VESSELS
FRACTURE MECHANICS
STEELS
CHEMICAL COMPOSITION
CRACK PROPAGATION
FRACTURE PROPERTIES
STRUCTURAL CHEMICAL ANALYSIS
WATER COOLED REACTORS
CAVITIES
CHROMIUM ALLOYS
CRACKS
CRYSTAL DEFECTS
DESIGN
FAILURES
GRAIN BOUNDARIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUCLEATION
REACTOR SAFETY
REGULATIONS
US NRC
VOIDS
WELDED JOINTS
ALLOYS
CONTAINERS
CRYSTAL STRUCTURE
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
NATIONAL ORGANIZATIONS
REACTORS
SAFETY
US ORGANIZATIONS
220900* - Nuclear Reactor Technology- Reactor Safety
210100 - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
210200 - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
360103 - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies