Acceptance criteria for corroded carbon steel piping containing weld defects

Conference · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6543474

Mertz, G E; Lam, P S; Awadalla, N G

Acceptance criteria for corroded low temperature, low pressure carbon steel piping containing weld defects is presented along with a typical application of these criteria. They are intended to preclude gross rupture or rapidly propagating failure due to uniform wall thinning, local wall thinning, pitting corrosion and weld defects. The minimum allowable uniform wail thickness is based on the code-of-record allowable stress and fracture criteria. Weld defects are postulated as potential sites for fracture initiation. CEGB/R6 failure assessment diagram is used as the fracture criteria to determine the minimum allowable wall thickness. Design of a large portion of the low temperature, low pressure piping is dominated by axial stresses. Existing local wall thinning acceptance criteria address high pressure piping where hoop stress dominates the design. The existing criteria is over conservative, in some cases, when used on low pressure piping. Local wall thinning criteria is developed to limit the axial stress on the locally thinned section, based on a reduced average thickness. Limits on pit density are also developed to provide acceptance criteria for pitted piping.

• Research Organization: Westinghouse Savannah River Co., Aiken, SC (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 6543474
• Report Number(s): WSRC-MS-93-037; CONF-930702--18; ON: DE93011703
• Country of Publication: United States
• Language: English

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CARBON STEELS
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SECONDARY COOLANT CIRCUITS
SPECIAL PRODUCTION REACTORS
STEELS
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