Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument

Alexis C. Kaplan; Vladimir Henzl; Howard O. Menlove; Martyn T. Swinhoe; Anthony P. Belian; Marek Flaska; Sara A. Pozzi

doi:10.1016/j.nima.2014.04.023

Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument

Alexis C. Kaplan, Vladimir Henzl, Howard O. Menlove, Martyn T. Swinhoe, Anthony P. Belian, Marek Flaska, Sara A. Pozzi

Ken and Mary Alice Lindquist Department of Nuclear Engineering

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17 Scopus citations

Abstract

We present a novel method for determining the multiplication of a spent nuclear fuel assembly with a Differential Die-Away Self-Interrogation (DDSI) instrument. The signal, which is primarily created by thermal neutrons, is measured with four ³He detector banks surrounding a spent fuel assembly. The Rossi-alpha distribution (RAD) at early times reflects coincident events from single fissions as well as fission chains. Because of this fact, the early time domain contains information about both the fissile material and spontaneous fission material in the assembly being measured. A single exponential function fit to the early time domain of the RAD has a die-away time proportional to the spent fuel assembly (SFA) multiplication. This correlation was tested by simulating assay of 44 different SFAs with the DDSI instrument. The SFA multiplication was determined with a variance of 0.7%.

Original language	English (US)
Pages (from-to)	20-27
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	757
DOIs	https://doi.org/10.1016/j.nima.2014.04.023
State	Published - Sep 1 2014

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2014.04.023

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Kaplan, A. C., Henzl, V., Menlove, H. O., Swinhoe, M. T., Belian, A. P., Flaska, M., & Pozzi, S. A. (2014). Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 757, 20-27. https://doi.org/10.1016/j.nima.2014.04.023

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title = "Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument",

abstract = "We present a novel method for determining the multiplication of a spent nuclear fuel assembly with a Differential Die-Away Self-Interrogation (DDSI) instrument. The signal, which is primarily created by thermal neutrons, is measured with four 3He detector banks surrounding a spent fuel assembly. The Rossi-alpha distribution (RAD) at early times reflects coincident events from single fissions as well as fission chains. Because of this fact, the early time domain contains information about both the fissile material and spontaneous fission material in the assembly being measured. A single exponential function fit to the early time domain of the RAD has a die-away time proportional to the spent fuel assembly (SFA) multiplication. This correlation was tested by simulating assay of 44 different SFAs with the DDSI instrument. The SFA multiplication was determined with a variance of 0.7%.",

author = "Kaplan, {Alexis C.} and Vladimir Henzl and Menlove, {Howard O.} and Swinhoe, {Martyn T.} and Belian, {Anthony P.} and Marek Flaska and Pozzi, {Sara A.}",

note = "Funding Information: This material is partially based upon work supported by the U.S. Department of Homeland Security under Grant Award Number, 2012-DN-130-NF0001-02 . The authors also would like to acknowledge the support of the Next Generation Safeguards Initiative (NGSI), Office of Nonproliferation and International Security (NIS) , National Nuclear Security Administration (NNSA) . The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Department of Homeland Security or the National Nuclear Security Administration . LA-UR-13-29465 .",

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Kaplan, AC, Henzl, V, Menlove, HO, Swinhoe, MT, Belian, AP, Flaska, M & Pozzi, SA 2014, 'Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 757, pp. 20-27. https://doi.org/10.1016/j.nima.2014.04.023

Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument. / Kaplan, Alexis C.; Henzl, Vladimir; Menlove, Howard O. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 757, 01.09.2014, p. 20-27.

Research output: Contribution to journal › Article › peer-review

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AU - Kaplan, Alexis C.

AU - Henzl, Vladimir

AU - Menlove, Howard O.

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AU - Belian, Anthony P.

AU - Flaska, Marek

AU - Pozzi, Sara A.

N1 - Funding Information: This material is partially based upon work supported by the U.S. Department of Homeland Security under Grant Award Number, 2012-DN-130-NF0001-02 . The authors also would like to acknowledge the support of the Next Generation Safeguards Initiative (NGSI), Office of Nonproliferation and International Security (NIS) , National Nuclear Security Administration (NNSA) . The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Department of Homeland Security or the National Nuclear Security Administration . LA-UR-13-29465 .

PY - 2014/9/1

Y1 - 2014/9/1

N2 - We present a novel method for determining the multiplication of a spent nuclear fuel assembly with a Differential Die-Away Self-Interrogation (DDSI) instrument. The signal, which is primarily created by thermal neutrons, is measured with four 3He detector banks surrounding a spent fuel assembly. The Rossi-alpha distribution (RAD) at early times reflects coincident events from single fissions as well as fission chains. Because of this fact, the early time domain contains information about both the fissile material and spontaneous fission material in the assembly being measured. A single exponential function fit to the early time domain of the RAD has a die-away time proportional to the spent fuel assembly (SFA) multiplication. This correlation was tested by simulating assay of 44 different SFAs with the DDSI instrument. The SFA multiplication was determined with a variance of 0.7%.

AB - We present a novel method for determining the multiplication of a spent nuclear fuel assembly with a Differential Die-Away Self-Interrogation (DDSI) instrument. The signal, which is primarily created by thermal neutrons, is measured with four 3He detector banks surrounding a spent fuel assembly. The Rossi-alpha distribution (RAD) at early times reflects coincident events from single fissions as well as fission chains. Because of this fact, the early time domain contains information about both the fissile material and spontaneous fission material in the assembly being measured. A single exponential function fit to the early time domain of the RAD has a die-away time proportional to the spent fuel assembly (SFA) multiplication. This correlation was tested by simulating assay of 44 different SFAs with the DDSI instrument. The SFA multiplication was determined with a variance of 0.7%.

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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ER -

Kaplan AC, Henzl V, Menlove HO, Swinhoe MT, Belian AP, Flaska M et al. Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2014 Sep 1;757:20-27. doi: 10.1016/j.nima.2014.04.023

Determination of spent nuclear fuel assembly multiplication with the differential die-away self-interrogation instrument

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