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First Industrial Tests of a Matrix Monitor Correction for the Differential Die-away Technique of Historic Waste Drums

R. Antoni 1, 2, * C. Passard 2 B. Perot 2 M. Batifol 3 J.-C. Vandamme 3 G. Grassi 3
* Corresponding author
1 LMN - Laboratoire de Mesures Nucléaires
SMTA - Service Mesures et modélisation des Transferts et des Accidents graves : DEN/DTN
Abstract : Abstract The fissile mass in radioactive waste drums filled with compacted metallic residues (spent fuel hulls and nozzles) produced at AREVA NC La Hague reprocessing plant is measured by neutron interrogation with the Differential Die-away measurement Technique (DDT). In the next years, old hulls and nozzles mixed with Ion-Exchange Resins will be measured. The ion-exchange resins increase neutron moderation in the matrix, compared to the waste measured in the current process. In this context, the Nuclear Measurement Laboratory (LMN) of CEA Cadarache has studied a matrix effect correction method, based on a drum monitor, namely a $^3$He proportional counter located inside the measurement cavity. After feasibility studies performed with LMN's PROMETHEE 6 laboratory measurement cell and with MCNPX simulations, this paper presents first experimental tests performed on the industrial ACC (hulls and nozzles compaction facility) measurement system. A calculation vs. experiment benchmark has been achieved by performing dedicated calibration measurements with a representative drum and $^{235}$U samples. The comparison between calculation and experiment shows a satisfactory agreement for the drum monitor. The final objective of this work is to confirm the reliability of the modeling approach and the industrial feasibility of the method, which will be implemented on the industrial station for the measurement of historical wastes.
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R. Antoni, C. Passard, B. Perot, M. Batifol, J.-C. Vandamme, et al.. First Industrial Tests of a Matrix Monitor Correction for the Differential Die-away Technique of Historic Waste Drums. Advancements in Nuclear Instrumentation Measurement Methods and their Applications - ANIMMA 2015, Apr 2015, Lisbonne, Portugal. ⟨10.1109/ANIMMA.2015.7465508⟩. ⟨cea-02509314⟩

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