Engineering methods for the assessment of ductile fracture margin in nuclear power plant piping

Conference · Thu Oct 01 04:00:00 EDT 1981 · Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States)

OSTI ID:6290493

Ranganath, S; Mehta, H S

When a crack is discovered during inspection of a piping component in a nuclear power plant, the decision on replacement is dependent on the available design margin of the pipe in the presence of the crack. This paper describes the development of engineering methods to assess the design margin in cracked pipes. Procedures are outlined to evaluate cracks in piping, using methods consistent with the American Society of Mechanical Engineers (ASME) Code design basis, and to develop failure diagrams for piping. A criterion based on net section collapse is shown to predict adequately the load capability of piping with cracks. The predictions of the net section collapse approach are shown to be consistent with results from elastic-plastic fracture analysis based on J-integral and R-curve methods. Finally, the methodology is used to recommend acceptance criteria for flaws in power plant piping. The proposed criteria assure that the minimum safety margins inherent in the ASME Code are preserved during operation. Since allowable flaw sizes can be determined using information already available in piping stress reports, the proposed criteria offer a simple conservative method for assessing flaws in piping.

• Research Organization: General Electric Co., San Jose, CA
• OSTI ID: 6290493
• Report Number(s): CONF-8110313-
• Conference Information: Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Journal Volume: STP-803
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
CRACKS
DESIGN
DIAGRAMS
DUCTILITY
FAILURES
FORECASTING
FRACTURE MECHANICS
FRACTURE PROPERTIES
INSPECTION
LIMITING VALUES
MECHANICAL PROPERTIES
MECHANICS
PIPES
STANDARDS
STRESS ANALYSIS
TENSILE PROPERTIES