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 Power Transmission, Distribution And Plants
 Fossil-fueled Power Plants
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Fracture assessment of Savannah River Reactor carbon steel piping. Revision 1
Authors:
Mertz, G.E.
Stoner, K.J.
Caskey, G.R. [Westinghouse Savannah River Co., Aiken, SC (United States)]
Begley, J.A. [Westinghouse Electric Corp., Pittsburgh, PA (United States)]
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| Abstract: The Savannah River Site (SRS) production reactors have been in operation since the mid-1950`s. One postulated failure mechanism for the reactor piping is brittle fracture of the original A285 and A53 carbon steel piping. Material testing of archival piping determined (1) the static and dynamic tensile properties; (2) Charpy impact toughness; and (3) the static and dynamic compact tension fracture toughness properties. The nil-ductility transition temperature (NDTT), determined by Charpy impact test, is above the minimum operating temperature for some of the piping materials. A fracture assessment was performed to demonstrate that potential flaws are stable under upset loading conditions and minimum operating temperatures. A review of potential degradation mechanisms and plant operating history identified weld defects as the most likely crack initiation site for brittle fracture. Piping weld defects, as characterized by radiographic and metallographic examination, and low fracture toughness material properties were postulated at high stress locations in the piping. Normal operating loads, upset loads, and residual stresses were assumed to act on the postulated flaws. Calculated allowable flaw lengths exceed the size of observed weld defects, indicating adequate margins of safety against brittle fracture. Thus, a detailed fracture assessment was able to demonstrate that the piping systems will not fail by brittle fracture, even though the NDTT for some of the piping is above the minimum system operating temperature. |
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| Publication Date: |
31 Dec 1991
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| Report numbers: |
WSRC-MS--91-268-Rev.1; CONF-920631--40-Rev.1
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| DOE Contract number: |
AC09-89SR18035
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| Resource Type: |
Conference
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| Resource Specific Type: |
Technical Report
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| Resource Relation: |
Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference,New Orleans, LA (United States),21-25 Jun 1992; Other Information: PBD: [1991]
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| Research Organizations: |
Westinghouse Savannah River Co., Aiken, SC (United States)
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| Sponsoring Organizations: |
USDOE, Washington, DC (United States)
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| Country of Publication: |
United States
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| Language: |
English
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Keywords relating to this report: 