Stress corrosion cracking of Alloys 600 and 182 in BWR environments. Interim report

Technical Report · Fri May 01 04:00:00 EDT 1992

OSTI ID:10158478

Ljungberg, L G; Hofling, C G; Sahlberg, A; Moeller, J ^[1]

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1. ABB Atom AB, Vaesteraas (Sweden)

Wrought Alloy 600 and weldments of Alloy 182 are being tested for initiation and propagation of intergranular stress corrosion cracking (IGSCC). Crack initiation is tested on compact tension (CT) specimens with U-notches of various radii under enhanced crevice conditions, in a test loop in a Swedish BWR. After one year exposure there was initiation of IGSCC in a large portion of the Alloy 182 specimens, but nearly no initiation in Alloy 600. Crack propagation was measured in a laboratory loop on CT specimens under constant or cyclic load. Low carbon Alloy 600, or Alloy 182 high in titanium and niobium versus carbon, cracked at lower rates than material with high carbon activity. Materials with low concentrations of phosphorus and sulfur cracked slower than those high in these elements in clean environment, but no such effect was found in environment with sulfate. Alloy 182 weld metal generally cracked at higher rates than Alloy 600.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); ABB Atom AB, Vaesteraas (Sweden)
• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 10158478
• Report Number(s): EPRI-TR--100658; ON: UN92016759
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210100
36 MATERIALS SCIENCE
360105
AGING
BWR TYPE REACTORS
CORROSION AND EROSION
CRACK PROPAGATION
INCONEL 600
INTERGRANULAR CORROSION
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
BOILING WATER COOLED
REACTOR COMPONENTS
STAINLESS STEEL-304
STRESS CORROSION
THERMAL EXPANSION
WELDED JOINTS