Metallurgical investigation of disc cracking in the LP-2 turbine at a nuclear power station. Final report. [PWR]

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5117230

Burghard, H C

An investigation of combined face cracking and rim cracking in discs of an LP steam turbine rotor was performed. The incident in question involved the development of major cracks in the hub/web transition on the outlet face of the disc as well as major cracking of the blade attachment steeples. Both types of cracking occurred in the No. 1 discs at both ends of a particular rotor. The program was based on a metallurgical evaluation of hub and rim samples of discs removed from the turbine rotor after approximately 31,000 hours of operation. In-depth metallographic and fractographic examinations of representative face cracks and rim cracks were conducted. In addition, the mechanical properties and chemical composition of each of the disc samples were determined. Analyses of crack surface deposits and bulk turbine deposits were also performed.

• Research Organization: Southwest Research Inst., San Antonio, TX (USA)
• OSTI ID: 5117230
• Report Number(s): EPRI-NP-2269; ON: DE82906428
• Country of Publication: United States
• Language: English

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
CHEMICAL REACTIONS
CORROSION
CRACKS
IRON ALLOYS
IRON BASE ALLOYS
MACHINERY
PERFORMANCE TESTING
PWR TYPE REACTORS
REACTORS
STEAM TURBINES
STEELS
STRESS CORROSION
TESTING
TURBINE BLADES
TURBINES
TURBOMACHINERY
WATER COOLED REACTORS
WATER MODERATED REACTORS