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

Research output: Contribution to journalArticlepeer-review

9 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 languageEnglish (US)
Pages (from-to)20-27
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume757
DOIs
StatePublished - Sep 1 2014

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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