Skip to main content
European Commission logo
ESARDA
Scientific paper

Ultrasonic Investigation of the Welding Area of Copper Canisters for Spent Nuclear Fuel

ESARDA Bulletin - The International Journal of Nuclear Safeguards and Non-Proliferation

Details

Identification
ISSN: 1977-5296, DOI: 10.3011/ESARDA.IJNSNP.2018.4
Publication date
1 June 2018
Author
Joint Research Centre

Description

Volume: 56, June 2018, pages 19-27

Authors: C. Clementi1,2, F. Littmann1, L. Capineri2

1Nuclear Security Unit, Joint Research Centre, European Commission, 2Dept. Information Engineering, University of Florence

Abstract:Geological repositories will be built in several countries for the long term storage of spent nuclear fuel. Sweden and Finland, for example, foresee the encapsulation of the spent fuel assemblies in copper canisters with iron inserts to be deposited in tunnels excavated about 500 metres underground in the bedrock. During the transport of canisters and the storage in the final repository, the Continuity of Knowledge (CoK) of spent fuel must be kept. Safeguards requirements suggest the implementation of a unique identification tag on copper canisters, strongly reliable and secure against falsification attempts. This paper presents a solution for the canisters’ authentication issue, using an innovative ultrasonic investigation of the internal gap between copper lid and canister tube. It provides a fingerprint strictly related to material features after the friction stir welding process. This fingerprint can be combined with the ultrasonic response of a unique code made by chamfers machined on the copper lid inner sur face. The angular matching between the two fingerprints (internal gap response and chamfers’ code reading) realizes a third signature more robust and reliable. A potential practical implementation of this solution is described experimentally in this paper.

Keywords: copper canisters; authentication; ultrasounds; encapsulation plant; geological repository

Reference guideline:

Clementi, C., Littmann, F., & Capineri, L. (2018). Ultrasonic Investigation of the Welding Area of Copper Canisters for Spent Nuclear Fuel. ESARDA Bulletin - The International Journal of Nuclear Safeguards and Non-proliferation, 56, 19-27. https://doi.org/10.3011/ESARDA.IJNSNP.2018.4

THMB_Bulletin-56_p.19-27-Clementi

Files

Ultrasonic Investigation of the Welding Area of Copper Canisters for Spent Nuclear Fuel
English
(877.64 KB - PDF)
Download