A multipurpose canister (MPC) made of austenitic stainless steel is loaded with used nuclear fuel assemblies and is part of the transfer cask system to move the fuel from the spent fuel pool to prepare for storage, and is part of the storage cask system for on-site dry storage. This weld-sealed canister is also expected to be part of the transportation package following storage. The canister may be subject to service-induced degradation especially if exposed to aggressive environments during possible very long-term storage period if the permanent repository is yet to be identified and readied. Stress corrosion cracking may be initiated on the canister surface in the welds or in the heat affected zone because the construction of MPC does not require heat treatment for stress relief. An acceptance criteria methodology is being developed for flaw disposition should the crack-like defects be detected by periodic Inservice Inspection. The external loading cases include thermal accident scenarios and cask drop conditions with the contribution from the welding residual stresses. The determination of acceptable flaw size is based on the procedure to evaluate flaw stability provided by American Petroleum Institute (API) 579 Fitness-for-Service (Second Edition). The material mechanical and fracture properties for base and weld metals and the stress analysis results are obtained from the open literature such as NUREG-1864. Subcritical crack growth from stress corrosion cracking (SCC), and its impact on inspection intervals and acceptance criteria, is not addressed.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4603-2
PROCEEDINGS PAPER
A Framework to Develop Flaw Acceptance Criteria for Structural Integrity Assessment of Multipurpose Canisters for Extended Storage of Used Nuclear Fuel Available to Purchase
Poh-Sang Lam,
Poh-Sang Lam
Savannah River National Laboratory, Aiken, SC
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Robert L. Sindelar,
Robert L. Sindelar
Savannah River National Laboratory, Aiken, SC
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Andrew J. Duncan,
Andrew J. Duncan
Savannah River National Laboratory, Aiken, SC
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Thad M. Adams
Thad M. Adams
Savannah River National Laboratory, Aiken, SC
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Poh-Sang Lam
Savannah River National Laboratory, Aiken, SC
Robert L. Sindelar
Savannah River National Laboratory, Aiken, SC
Andrew J. Duncan
Savannah River National Laboratory, Aiken, SC
Thad M. Adams
Savannah River National Laboratory, Aiken, SC
Paper No:
PVP2014-28990, V06AT06A019; 7 pages
Published Online:
November 18, 2014
Citation
Lam, P, Sindelar, RL, Duncan, AJ, & Adams, TM. "A Framework to Develop Flaw Acceptance Criteria for Structural Integrity Assessment of Multipurpose Canisters for Extended Storage of Used Nuclear Fuel." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06AT06A019. ASME. https://doi.org/10.1115/PVP2014-28990
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