Microstructural Evaluation of High Temperature Creep Behavior in Hydrided E11 0 Cladding

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F16%3AN0000202" target="_blank" >RIV/26722445:_____/16:N0000202 - isvavai.cz</a>

Result on the web

<a href="https://www.djs.si/proc/nene2016/html/pdf/NENE2016_601.pdf" target="_blank" >https://www.djs.si/proc/nene2016/html/pdf/NENE2016_601.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Microstructural Evaluation of High Temperature Creep Behavior in Hydrided E11 0 Cladding

Original language description

In this work, EllO cladding creep behaviour at dry storage conditions is studied. Test specimen was oxidized in an autoclave to have 334 ppm of hydrogen by weight. Creep test was performed in a horizontal furnace with internal pressure of 55 MPa at 530°C test temperature for a period of 30 hours. Optical and transmission electron microscopy investigations were made on creep tested specimen to reveal hydride re-orientation, interaction of dislocations, secondary precipitate particles and location of hydrides with grain boundaries owing to different deformed zones. Optical micrographs revealed hydrides oriented in the circumferential direction and absence of re-oriented hydrides (radial hydrides). TEM images showed polyhedral grains of a - Zr phase with hexagonal lattice and lattice parameters a = b = 3.136 A, c = 5.039 A, a = ~ = 90 0 , Y = 120 ° with grain size ranges from ~ 3-5 microns. Grains are recrystallized with boundaries straight or slightly curved, and often there are sub-grains and twinning. Numerous dislocations and precipitates of secondary phases in a - phase were observed. From these observations it is concluded that at the applied stress and hydrogen level, though the cladding is deformed and ballooned, no radial hydrides are formed that could further reduce the mechanical integrity of the cladding. Increase of dislocations in grains linked together with grain boundary sliding could cause the ballooning/deformation of cladding with reduction in thickness at the applied stress level, temperature and hydrogen content.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

NENE 2016 : 25th International Conference Nuclear Energy for New Europe

ISBN

978-961-6207-39-3

ISSN

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e-ISSN

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Number of pages

14

Pages from-to

1-14

Publisher name

Nuclear Society of Slovenia

Place of publication

Ljubljana, Slovenia

Event location

Portorož, Slovenia

Event date

Sep 5, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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