Evaluation of Testing Facilities for a High Temperature Fission Chamber Design

During the operation of the Superphenix and Phenix reactors, an aberrant electrical signal was detected from the fission chambers used for neutron flux monitoring. This signal, thought to be due to partial electrical discharge (PD) is similar to the signal resulting from neutron interactions, and is generated in fission chambers at temperatures above 400 °C. This paper reports work on the characterization and localization of the source of this electrical signal in a High Temperature Fission Chamber (HTFC). The relation between the shape of the PD signal and various parameters (nature and pressure of the chamber filling gas, electrode gap distance, and fission chamber geometry) are first described. Next, experiments designed to identify the location within the chambers where the PD are being generated are presented. After verification and refinement of the results of these localization studies, it should be possible to propose changes to the fission chamber in order to reduce or eliminate the PD signal.

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Commercial Design of Custom Front-end Electronics for a High Temperature Fission Chamber

10.2172/1479737 ◽

2018 ◽

Author(s):

N. Dianne Bull Ezell ◽

Lorenzo Fabris ◽

Richard J. Wunderlich ◽

Padhraic L. Mulligan ◽

Christian M. Petrie ◽

...

Keyword(s):

High Temperature ◽

Fission Chamber ◽

Front End

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A new discriminating high temperature fission chamber filled with xenon designed for sodium-cooled fast reactors

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2020.163947 ◽

2020 ◽

Vol 968 ◽

pp. 163947

Author(s):

G. Galli ◽

H. Hamrita ◽

M.J. Kirkpatrick ◽

E. Odic ◽

C. Jammes

Keyword(s):

High Temperature ◽

Fast Reactors ◽

Fission Chamber

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Assessment of the high temperature fission chamber technology for the French fast reactor program

2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications ◽

10.1109/animma.2011.6172895 ◽

2011 ◽

Cited By ~ 2

Author(s):

C. Jammes ◽

P. Filliatre ◽

B. Geslot ◽

T. Domenech ◽

S. Normand

Keyword(s):

High Temperature ◽

Fast Reactor ◽

Fission Chamber

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Assessment of the High Temperature Fission Chamber Technology for the French Fast Reactor Program

IEEE Transactions on Nuclear Science ◽

10.1109/tns.2012.2205161 ◽

2012 ◽

Vol 59 (4) ◽

pp. 1351-1359 ◽

Cited By ~ 16

Author(s):

Christian Jammes ◽

Philippe Filliatre ◽

Benoit Geslot ◽

Thierry Domenech ◽

Stephane Normand

Keyword(s):

High Temperature ◽

Fast Reactor ◽

Fission Chamber

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A new anechoic chamber design for testing high-temperature jet flows

10.2514/6.2001-2190 ◽

2001 ◽

Cited By ~ 8

Author(s):

Michael Ponton ◽

John Seiner ◽

Lawrence Ukeiley ◽

Bernard Jansen

Keyword(s):

High Temperature ◽

Anechoic Chamber ◽

Jet Flows ◽

Chamber Design

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Closed, heated reaction chamber design for dynamic high-temperature x-ray-diffraction analyses of gas/solid displacement reactions

Review of Scientific Instruments ◽

10.1063/1.2136076 ◽

2005 ◽

Vol 76 (12) ◽

pp. 126101 ◽

Cited By ~ 1

Author(s):

Michael S. Haluska ◽

Robert L. Snyder ◽

Kenneth H. Sandhage ◽

Scott T. Misture

Keyword(s):

High Temperature ◽

Reaction Chamber ◽

X Ray Diffraction ◽

X Ray ◽

Chamber Design ◽

Displacement Reactions

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Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071363 ◽

1973 ◽

Vol 31 ◽

pp. 184-185

Author(s):

M.S. Grewal ◽

S.A. Sastri ◽

N.J. Grant

Keyword(s):

High Temperature ◽

Nickel Alloys ◽

Thermomechanical Processing ◽

Cold Work ◽

High Temperature Strength ◽

Strengthening Effect ◽

Mechanical Processing ◽

Uniform Dispersion ◽

Oxide Particles ◽

Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

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Application of TEM to Deformation, Wear, and Fracture of Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052377 ◽

1974 ◽

Vol 32 ◽

pp. 472-473

Author(s):

B. J. Hockey

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Mechanical Behavior ◽

Brittle Materials ◽

High Temperature Strength ◽

Wide Range ◽

Corrosive Environments ◽

Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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Lattice Imaging of Grain Boundaries in Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100078171 ◽

1977 ◽

Vol 35 ◽

pp. 114-115

Author(s):

D. R. Clarke ◽

G. Thomas

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Silicon Nitride ◽

Grain Boundaries ◽

High Temperature Strength ◽

Current Interest ◽

Lattice Imaging ◽

Special Significance ◽

Structural Applications ◽

Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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