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Characterization of Spent Nuclear Fuel with a Differential Die-Away Instrument
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Los Alamos National Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-5133-6829
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2014 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The Differential die-away instrument (DDA) is currently being investigated within the Next Generation Safeguards Initiative Spent Fuel project as one of the non-destructive assay techniques for spent nuclear fuel characterization and verification. In this paper we report on the progress of designing the first prototype to be deployed at Swedish central interim storage facility (CLAB) where a first set of measurements of 25 PWR and 25BWR spent fuel assemblies is proposed. We also present several working concepts of how the instrument can be customized for dedicated purposes, be it a light weight instrument for portable applications, a minimalist design for reliable and economic operations or a so-called “defectoscope” design for detailed inspection of spent nuclear fuel assemblies.

Place, publisher, year, edition, pages
2014.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-242357OAI: oai:DiVA.org:uu-242357DiVA, id: diva2:783325
Conference
IAEA Symposium on International Safeguards: Linking Strategy, Implementation and People
Available from: 2015-01-26 Created: 2015-01-26 Last updated: 2018-04-19
In thesis
1. Development of Differential Die-Away Instrument for Characterization of Swedish Spent Nuclear Fuel
Open this publication in new window or tab >>Development of Differential Die-Away Instrument for Characterization of Swedish Spent Nuclear Fuel
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The Next Generation Safeguards Initiative Spent Fuel (NGSI-SF) project was established in 2009 by the U.S. Departmentof Energy with main objective to investigate, and potentially develop and test new technologies for spent nuclearfuel (SNF) characterization. In Sweden the SNF is currently being considered to be verified and encapsulated in canistersand deposited into a geological repository. The need for an independent instrument for SNF verification by theSwedish operator turned into the collaborative effort with NGSI-SF to develop an instrument for future deployment inSweden.One of the techniques investigated within this project is the differential die-away (DDA) technique, which followingthe theoretical investigation by means of high fidelity Monte Carlo simulations indicated the potential to be applied fordetermining of various spent fuel assembly (SFA) parameters.This work introduces the first deployable DDA instrument which was designed to be used for characterizing ofSwedish SFAs currently stored in the Central Interim Storage Facility for Spent Nuclear Fuel (Clab). All the instrumentcomponents relevant for DDA design functionality were evaluated to ensure reliable operation in Clab. Although mostof the components were tuned with special consideration given to concerns from the operator (The Spent Nuclear FuelandWaste Management Company) , several post-simulation modification of the design were made. These modificationsare described in this work.A complementary study of the detector responses to asymmetrically burned SFAs indicated a different detector responses,depending on which of the four different orientations was used to assay individual SFAs. This study illustratedthe sensitivity of detectors with respect to the SFA orientation if there is a strong burn-up gradient across the SFA andhence a strong asymmetry in isotopic distribution in the SFA. In addition, the study of asymmetry provided the informationon different operational scenarios of the DDA instrument. The DDA instrument may provide general informationabout the complete SFA as well as give local information about certain parts of the SFA.

Place, publisher, year, edition, pages
Uppsala University, 2016. p. 40
National Category
Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-268143 (URN)
Presentation
2016-04-15, Ångström Laboratory, Uppsala, 09:00 (English)
Opponent
Supervisors
Available from: 2015-12-04 Created: 2015-12-02 Last updated: 2018-06-08Bibliographically approved

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Martinik, TomasGrape, SophieJacobsson Svärd, StaffanJansson, PeterTobin, Stephen

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