Fission Gas Behaviour in a Multiscale modelling Context: 10 years of research at SCK-CEN

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Fission Gas Behaviour in a Multiscale modelling Context: 10 years of research at SCK-CEN. / Govers, Kevin; Lemehov, Sergei; Verwerft, Marc.

Proceedings of the WRFPM 2011. Chengdu, China, 2011. p. T243.

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Govers, K, Lemehov, S & Verwerft, M 2011, Fission Gas Behaviour in a Multiscale modelling Context: 10 years of research at SCK-CEN. in Proceedings of the WRFPM 2011. Chengdu, China, pp. T243, 2011 - WRFPM - Water Reactor Fuel Performance Meeting (TopFuel), Chengdu, China, 2011-09-11.

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@inproceedings{7b1973b611a54ee2a46c869080e8a9e3,
title = "Fission Gas Behaviour in a Multiscale modelling Context: 10 years of research at SCK-CEN",
abstract = "Fission gas behaviour has a major effect on fuel rod performance and the phenomenon is even more marked at high burnup considering their accumulated yield. The fraction of the produced gas that precipitates inside the grains or at grain boundaries presents a larger effective volume than the atomically-dissolved fraction, enhancing as such fuel swelling. Gas that could escape from the fuel has a beneficial effect on fuel swelling, but still imposes constraints on the cladding through an increase of rod internal pressure. An accurate inventory of the gas in its different forms would therefore enable to better estimate the margin to rod failure both under normal and accident conditions. Over the past decade, SCK•CEN has investigated fission gas behaviour at the meso- and nano-scale through experimental (Scanning Electron Microscopy, SEM; Electron Probe Micro-Analysis, EPMA; rod puncture; gamma-spectrometry) and theoretical work. These studies have recently been supported by up-to-date atomic scale computer experiments which shed some light on the underlying primary mechanisms at play. The findings also provided an atomistic base for the existence of a well-defined threshold for fission gas release, commonly known as the {"}Halden threshold{"}, well known to nuclear fuel researchers and engineers.",
keywords = "Fission gas release, thermal spike, Xe bubble, UO2",
author = "Kevin Govers and Sergei Lemehov and Marc Verwerft",
note = "Score = 3; 2011 - WRFPM - Water Reactor Fuel Performance Meeting (TopFuel) ; Conference date: 11-09-2011 Through 15-09-2011",
year = "2011",
month = sep,
day = "11",
language = "English",
pages = "T243",
booktitle = "Proceedings of the WRFPM 2011",

}

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TY - GEN

T1 - Fission Gas Behaviour in a Multiscale modelling Context: 10 years of research at SCK-CEN

AU - Govers, Kevin

AU - Lemehov, Sergei

AU - Verwerft, Marc

N1 - Score = 3

PY - 2011/9/11

Y1 - 2011/9/11

N2 - Fission gas behaviour has a major effect on fuel rod performance and the phenomenon is even more marked at high burnup considering their accumulated yield. The fraction of the produced gas that precipitates inside the grains or at grain boundaries presents a larger effective volume than the atomically-dissolved fraction, enhancing as such fuel swelling. Gas that could escape from the fuel has a beneficial effect on fuel swelling, but still imposes constraints on the cladding through an increase of rod internal pressure. An accurate inventory of the gas in its different forms would therefore enable to better estimate the margin to rod failure both under normal and accident conditions. Over the past decade, SCK•CEN has investigated fission gas behaviour at the meso- and nano-scale through experimental (Scanning Electron Microscopy, SEM; Electron Probe Micro-Analysis, EPMA; rod puncture; gamma-spectrometry) and theoretical work. These studies have recently been supported by up-to-date atomic scale computer experiments which shed some light on the underlying primary mechanisms at play. The findings also provided an atomistic base for the existence of a well-defined threshold for fission gas release, commonly known as the "Halden threshold", well known to nuclear fuel researchers and engineers.

AB - Fission gas behaviour has a major effect on fuel rod performance and the phenomenon is even more marked at high burnup considering their accumulated yield. The fraction of the produced gas that precipitates inside the grains or at grain boundaries presents a larger effective volume than the atomically-dissolved fraction, enhancing as such fuel swelling. Gas that could escape from the fuel has a beneficial effect on fuel swelling, but still imposes constraints on the cladding through an increase of rod internal pressure. An accurate inventory of the gas in its different forms would therefore enable to better estimate the margin to rod failure both under normal and accident conditions. Over the past decade, SCK•CEN has investigated fission gas behaviour at the meso- and nano-scale through experimental (Scanning Electron Microscopy, SEM; Electron Probe Micro-Analysis, EPMA; rod puncture; gamma-spectrometry) and theoretical work. These studies have recently been supported by up-to-date atomic scale computer experiments which shed some light on the underlying primary mechanisms at play. The findings also provided an atomistic base for the existence of a well-defined threshold for fission gas release, commonly known as the "Halden threshold", well known to nuclear fuel researchers and engineers.

KW - Fission gas release

KW - thermal spike

KW - Xe bubble

KW - UO2

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_115553

UR - http://knowledgecentre.sckcen.be/so2/bibref/8267

M3 - In-proceedings paper

SP - T243

BT - Proceedings of the WRFPM 2011

CY - Chengdu, China

T2 - 2011 - WRFPM - Water Reactor Fuel Performance Meeting (TopFuel)

Y2 - 11 September 2011 through 15 September 2011

ER -

ID: 212490