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Results of the Swedish spent fuel measurement field trials with the Differential Die-Away Self-Interrogation Instrument
Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
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2020 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 955, article id 163329Article in journal (Refereed) Published
Abstract [en]

Differential Die-Away Self-Interrogation (DDSI) is a method by which the characteristic die-away of neutrons from spontaneous and induced fissions is used to characterize a spent nuclear fuel assembly. A nondestructive assay (NDA) instrument was built at Los Alamos National Laboratory to implement and test the DDSI method. The DDSI instrument contains He-3 detectors which measure thermal neutrons, and the time and location of detection of each neutron is recorded via list-mode data acquisition. The instrument was sent to the Clab interim storage facility in Sweden for measurement and characterization of 50 spent pressurized water reactor (PWR) and boiling water reactor (BWR) fuel assemblies. The result was over 40 h of neutron list-mode data from a wide variety of fuel assemblies with high enough efficiency to perform neutron coincidence counting, i.e. detection of time-correlated neutrons from fission. Analysis algorithms for characterization of the fuel assemblies were tested on the Swedish spent fuel dataset. Using the measured data, multiplication, fissile mass, initial enrichment, burnup, and total plutonium mass were determined in the 50 assemblies with root mean square errors ranging from 1.5% for PWR multiplication to 11.4% for BWR fissile mass. The results in this work demonstrate that the DDSI concept is capable of characterizing spent power reactor fuel with levels of accuracy that are compatible with the requirements and objectives of various applications such as safeguards verification or facility material control and accounting.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 955, article id 163329
Keywords [en]
Differential Die-Away Self-Interrogation, Safeguards, Repository safeguards, Spent fuel, Neutron detection, Nondestructive assay
National Category
Subatomic Physics Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:uu:diva-407139DOI: 10.1016/j.nima.2019.163329ISI: 000508940400034OAI: oai:DiVA.org:uu-407139DiVA, id: diva2:1415850
Available from: 2020-03-20 Created: 2020-03-20 Last updated: 2020-03-20Bibliographically approved

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Caldeira Balkeståhl, LiGrape, Sophie

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Subatomic PhysicsOther Engineering and Technologies not elsewhere specified

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