scholarly journals A Design Study of the Parallel-Slit Ring Collimator for Fast Neutron Emission Tomography of Spent Fuel

2018 ◽  
Author(s):  
Paul Hausladen ◽  
Anagha S. Iyengar ◽  
Lorenzo Fabris ◽  
Jinan Yang ◽  
Jianwei Hu
Keyword(s):  
Fast Neutron ◽  
Neutron Emission ◽  
Emission Tomography ◽  
Spent Fuel ◽  
Design Study ◽  
Parallel Slit

Investigation of fast neutron emission of spent fuel assemblies with CR-39 track etch detector

1995 ◽  
Vol 25 (1-4) ◽  
pp. 695-698 ◽  
Author(s):  
N.C. Tam ◽  
K. Baricza ◽  
I. Pavlicsek ◽  
L. Lakosi
Keyword(s):  
Fast Neutron ◽  
Neutron Emission ◽  
Spent Fuel ◽  
Fuel Assemblies ◽  
Track Etch

scholarly journals Quantitative imaging and automated fuel pin identification for passive gamma emission tomography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ming Fang ◽  
Yoann Altmann ◽  
Daniele Della Latta ◽  
Massimiliano Salvatori ◽  
Angela Di Fulvio
Keyword(s):  
Inverse Problem ◽  
Image Reconstruction ◽  
Image Resolution ◽  
Emission Tomography ◽  
Nuclear Safeguards ◽  
Activity Levels ◽  
Spent Fuel ◽  
Gamma Emission ◽  
Cross Sectional ◽  
Fuel Rods

AbstractCompliance of member States to the Treaty on the Non-Proliferation of Nuclear Weapons is monitored through nuclear safeguards. The Passive Gamma Emission Tomography (PGET) system is a novel instrument developed within the framework of the International Atomic Energy Agency (IAEA) project JNT 1510, which included the European Commission, Finland, Hungary and Sweden. The PGET is used for the verification of spent nuclear fuel stored in water pools. Advanced image reconstruction techniques are crucial for obtaining high-quality cross-sectional images of the spent-fuel bundle to allow inspectors of the IAEA to monitor nuclear material and promptly identify its diversion. In this work, we have developed a software suite to accurately reconstruct the spent-fuel cross sectional image, automatically identify present fuel rods, and estimate their activity. Unique image reconstruction challenges are posed by the measurement of spent fuel, due to its high activity and the self-attenuation. While the former is mitigated by detector physical collimation, we implemented a linear forward model to model the detector responses to the fuel rods inside the PGET, to account for the latter. The image reconstruction is performed by solving a regularized linear inverse problem using the fast-iterative shrinkage-thresholding algorithm. We have also implemented the traditional filtered back projection (FBP) method based on the inverse Radon transform for comparison and applied both methods to reconstruct images of simulated mockup fuel assemblies. Higher image resolution and fewer reconstruction artifacts were obtained with the inverse-problem approach, with the mean-square-error reduced by 50%, and the structural-similarity improved by 200%. We then used a convolutional neural network (CNN) to automatically identify the bundle type and extract the pin locations from the images; the estimated activity levels finally being compared with the ground truth. The proposed computational methods accurately estimated the activity levels of the present pins, with an associated uncertainty of approximately 5%.

Design study of a modular dry storage facility for typical PWR spent fuel

2006 ◽  
Vol 48 (6) ◽  
pp. 487-494 ◽  
Author(s):  
Masood Iqbal ◽  
J. Khan ◽  
Sikander M. Mirza
Keyword(s):  
Storage Facility ◽  
Spent Fuel ◽  
Design Study ◽  
Dry Storage

Fast neutron emission in (α, 2n) reactions: A neutron skin effect?

1981 ◽  
Vol 106 (6) ◽  
pp. 453-456 ◽  
Author(s):  
C.A. Fields ◽  
F.W.N. De Boer ◽  
R.A. Ristinen ◽  
P.A. Smith ◽  
E. Sugarbaker
Keyword(s):  
Fast Neutron ◽  
Skin Effect ◽  
Neutron Emission ◽  
Neutron Skin

Fast Neutron Emission from a High-Energy Ion Beam Produced by a High-Intensity Subpicosecond Laser Pulse

1999 ◽  
Vol 82 (7) ◽  
pp. 1454-1457 ◽  
Author(s):  
L. Disdier ◽  
J-P. Garçonnet ◽  
G. Malka ◽  
J-L. Miquel
Keyword(s):  
Laser Pulse ◽  
Fast Neutron ◽  
High Intensity ◽  
Neutron Emission ◽  
Ion Beam ◽  
High Energy

scholarly journals Fission fragments observables measured at the LOHENGRIN spectrometer

2020 ◽  
Vol 239 ◽  
pp. 05017
Author(s):  
S. Julien-Laferrière ◽  
L. Thombansen ◽  
G. Kessedjian ◽  
A. Chebboubi ◽  
O. Serot ◽  
...  
Keyword(s):  
Neutron Emission ◽  
Evaluation Process ◽  
Nuclear Data ◽  
Nuclear Fission ◽  
Experimental Program ◽  
Spent Fuel ◽  
Ionic Charge ◽  
Fission Fragments ◽  
Common Effort ◽  
Fission Yields

Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained. Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation. Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility.

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