Improved analysis for matrix effect correction in LLW neutronic assay

Raoux, A.C.; Loridon, J.; Mariani, Alberto; Passard, C.

doi:10.1016/j.nimb.2008.07.021

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…The total fissile mass of 235 U is close to 10 g and the 238 U mass is larger than 200 g. Self-shielding in the pellets has been estimated by MCNP calculation to be lower than 30%. The two GENIE 36 pulsed neutron generators from EADS SODERN are operated at an average total emission of 5.5 10 9 n/s [4 ], with a 140 kV high voltage, ~100 Hz pulse frequency, and 200 μs pulse duration. The signal from 3 He tube is processed by current amplifiers and a 64 channels MEDAS dating electronic card.…”

Section: Experimental Set-up and Measurementmentioning

confidence: 99%

“…The Nuclear Measurement Laboratory (LMN) of CEA Cadarache is exploring options for implementing a matrix effect correction on the industrial neutron measurement station P0 which is based on the Differential Die-away Technique [2] [3]. This matrix effect correction method is based on the use of a drum 3 He monitor signal sensitive to matrix materials [4]. In order to validate this method, the differences between experimental results and MCNPX calculations [5] have been first investigated with the "PROMETHEE 6" R&D cell of CEA Cadarache, which was modified to approach the neutron moderation and absorption properties of the industrial P0 cell.…”

Section: Introductionmentioning

confidence: 99%

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First industrial tests of a matrix monitor correction for the differential die-away technique of historical waste drums

Antoni

Passard

Pérot

et al. 2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

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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 Dieaway 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 carried out 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.Index Terms -Differential Die-away Technique (DDT), matrix effect correction, numerical simulations, drum monitor, radioactive waste.

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Section: Experimental Set-up and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First industrial tests of a matrix monitor correction for the differential die-away technique of historical waste drums

Antoni

Passard

Pérot

et al. 2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

View full text Add to dashboard Cite

show abstract

“…The performances of the activity measurement methods particularly depend on the contaminant to be quantified, and on the waste matrix (density, composition), which can greatly impact the net signal by scattering and absorbing the interrogating and detected radiations or particles. Matrix effects may be of great importance and induce the development of dedicated correction methods [8][9][10] in order to reduce the associated uncertainty.…”

Section: Introductionmentioning

confidence: 99%

“…The application of passive and active neutron measurements on low density waste drums (less than 0.4) is continuously being studied at the Nuclear Measurement Laboratory of CEA Cadarache (France) [5,6,[8][9][10][11][12]. As an example, the waste package dealt with in this paper is a high density drum ($2.35), which consists of about 15% (in weight) of materials contaminated by radioactive or nuclear matter (such as gloves, overshoes, laboratory tools, machines, etc.…”

Section: Introductionmentioning

confidence: 99%