0
Research Papers

Characterization of Incandescent Particles Emitted by a Cut-Off Grinder During Decommissioning Operations for Evaluating Filter Degradation

[+] Author and Article Information
Pierre Marchal

Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
PSN-RES, SCA, LECEV, BP 68, 91192 Gif-sur-Yvette, France

Emmanuel Porcheron

Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
PSN-RES, SCA, LECEV, BP 68, 91192 Gif-sur-Yvette, France
e-mail: emmanuel.porcheron@irsn.fr

Gérard Grehan

Centre National de la Recherche Scientifique (CNRS),
CORIA, UMR6614, Site Universitaire du Madrillet, 675, avenue de l’Université, BP 12, 76801 Saint Etienne du Rouvray Cedex, France
e-mail: gerard.grehan@coria.fr

Luc Lafanechere

Electricité De France (EDF), CIDEN,
154 Avenue Thiers, 69458 Lyon, France
e-mail: luc.lafanechere@edf.fr

Jonathan Walter

Electricité De France (EDF), CIDEN, 154 Avenue Thiers, 69458 Lyon, France
e-mail: jonathan.walter@edf.fr

Thomas Gelain

Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
BP 68, 91192 Gif-sur-Yvette, France
e-mail: thomas.gelain@irsn.fr

1Corresponding author.

Manuscript received September 2, 2014; final manuscript received November 14, 2014; published online March 24, 2015. Assoc. Editor: Tomio Okawa.

ASME J of Nuclear Rad Sci 1(2), 021005 (Mar 24, 2015) (8 pages) Paper No: NERS-14-1039; doi: 10.1115/1.4029343 History: Received September 02, 2014; Accepted December 17, 2014; Online March 24, 2015

The use of mechanical or thermal cutting tools when decommissioning nuclear facilities generates a lot of incandescent particles. These particles may represent a deterioration risk of the containment barriers associated with a potential fire hazard. The aim of this study is to characterize, in terms of temperature, diameter, and velocity, the incandescent particles emitted by a wheel grinder and to follow these parameters all along their path from emission point to their impact on the air filter. The characteristics of the particles correlated with a possible loss of filter efficiency should identify which particles degrade the filter. All the measurement techniques used to experimentally characterize the incandescent particles are presented in this article. Particles are characterized in terms of diameter by microscope visualizations. The particle velocity is measured with a high-speed camera using the particle tracking velocimetry (PTV) technique. An adaptation of a commercial monochromatic pyrometer is achieved to measure the temperature of the in-flight particles in a specific configuration. All of these techniques have been implemented on an experimental facility reproducing representative conditions of the cutting processes realized during dismantling operations. Both a global and a local approach to filter degradation are used to investigate the filter. The decontamination factor of a high efficiency particle air (HEPA) filter is measured, and detailed visualizations of the filter fiber deteriorations are obtained using a scanning electron microscope (SEM).

Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

The cut-off wheel grinder implemented in CAPIMIF at 1.5 m from the filter

Grahic Jump Location
Fig. 2

Proceeding of a cutting sequence with the cut-off wheel grinder

Grahic Jump Location
Fig. 3

Microscopic visualization of particles on a sampling filter

Grahic Jump Location
Fig. 4

High-speed camera visualization of incandescent particle trails in the measuring section

Grahic Jump Location
Fig. 5

Pyrometer measurement in nominal conditions of use

Grahic Jump Location
Fig. 6

Pyrometer measurement configuration with moving incandescent particles

Grahic Jump Location
Fig. 7

CAPIMIF geometry simulated in the CFX code

Grahic Jump Location
Fig. 8

Particle cone emission used in the code

Grahic Jump Location
Fig. 9

Mesh structure used on the duct

Grahic Jump Location
Fig. 10

Particle velocity according to their diameter calculated with ANSYS CFX at several distances from the source

Grahic Jump Location
Fig. 11

Particle temperature according to their diameter calculated with ANSYS CFX at several distances from the source

Grahic Jump Location
Fig. 12

SEM visualization on deposited particle sample at 0.8 m from emission source on the duct

Grahic Jump Location
Fig. 13

Peripheral speed of the cut-off wheel grinder during three identical cuttings

Grahic Jump Location
Fig. 14

Particles size distribution (percentage) on sampling filter measured with the Morphologi, at 2.38 m from the particles emission point

Grahic Jump Location
Fig. 15

Number of incandescent particles per cutting second seen with the high-speed camera at different distances from the particle generation point

Grahic Jump Location
Fig. 16

Average velocity of the 10% fastest incandescent particles at several distances from the particle emission point for different airflows

Grahic Jump Location
Fig. 17

Pyrometer temperature of incandescent particles at 1.58 m from the particles’ generation point

Grahic Jump Location
Fig. 18

Average number of particles per cutting second depending on their temperature at 1.28 and 2.98 m from the source

Grahic Jump Location
Fig. 19

SEM visualization of particles on a sampling filter at 0.6 m from the source

Grahic Jump Location
Fig. 20

SEM visualization of melted filter fiber near a particle impact point

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In