CANDU reactors use Zr-2.5 Nb alloy pressure tubes, as the primary pressure boundary within the reactor core. These components are subject to periodic inspection and material surveillance programs. Occasionally, the inspection program uncovers a flaw, whereupon the flaw is assessed as to whether it compromises the integrity of the pressure-retaining component. In 1998, such a flaw was observed in one pressure tube of a reactor. Non-destructive techniques and analysis were used to form a basis to disposition the flaw, and the component was fit for a limited service life. This component was eventually removed from service, whereupon the destructive examinations were used to validate the disposition assumptions used. Such a process of validation provides credibility to the disposition process. This paper reviews the original flaw and its subsequent destructive evaluation.
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ASME 2002 Pressure Vessels and Piping Conference
August 5–9, 2002
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-1948-5
PROCEEDINGS PAPER
Experiences in Examining and Dispositioning Flaws in Zr-2.5Nb Pressure Retaining CANDU Reactor Components
Andrew Celovsky,
Andrew Celovsky
AECL – Chalk River Laboratories, Chalk River, Ontario, Canada
Search for other works by this author on:
John Slade
John Slade
NB Power, Point Lepreau, New Brunswick, Canada
Search for other works by this author on:
Andrew Celovsky
AECL – Chalk River Laboratories, Chalk River, Ontario, Canada
John Slade
NB Power, Point Lepreau, New Brunswick, Canada
Paper No:
PVP2002-1187, pp. 165-169; 5 pages
Published Online:
August 14, 2008
Citation
Celovsky, A, & Slade, J. "Experiences in Examining and Dispositioning Flaws in Zr-2.5Nb Pressure Retaining CANDU Reactor Components." Proceedings of the ASME 2002 Pressure Vessels and Piping Conference. Service Experience and Failure Assessment Applications. Vancouver, BC, Canada. August 5–9, 2002. pp. 165-169. ASME. https://doi.org/10.1115/PVP2002-1187
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