TEM RADIATION DAMAGE INVESTIGATION OF NEUTRON IRRADIATED BAFFLE-TO-FORMER BOLT EXTRACTED FROM A DECOMMISSIONED WWER-440 REACTOR

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F14%3APU105783" target="_blank" >RIV/00216305:26210/14:PU105783 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

TEM RADIATION DAMAGE INVESTIGATION OF NEUTRON IRRADIATED BAFFLE-TO-FORMER BOLT EXTRACTED FROM A DECOMMISSIONED WWER-440 REACTOR

Popis výsledku v původním jazyce

This study shows results of a radiation microstructure investigation of the baffle-to-former bolt irradiated to 11.4 dpa in real in-service LWR conditions of decommissioned WWER-440 reactor from Greifswald, Germany. The influence of temperature and dose gradients along the bolt was taken into account in the investigation of radiation defects evolution. Since an irradiation temperature about 270C in the bolt head is expected, a significantly higher temperature about 398C is predicted in the end of the bolt due to gamma heating. Also a continuous decrease of neutron dose and dose rate from bolt head towards the bottom of the bolt is present. Three positions along the bolt shank were investigated by TEM: one in each side, and one in the middle of the shank, respectively. Each position was experienced by different irradiation conditions. The TEM observations showed a presence of several radiation-induced defects: Frank dislocation loops, cavities, and Ni-Si rich precipitates. Since the population of Frank loops showed saturated state in each position, the population of cavities and radiation-induced precipitates ascertained specific evolution relatively to irradiation conditions present in particular position of investigation.

Název v anglickém jazyce

TEM RADIATION DAMAGE INVESTIGATION OF NEUTRON IRRADIATED BAFFLE-TO-FORMER BOLT EXTRACTED FROM A DECOMMISSIONED WWER-440 REACTOR

Popis výsledku anglicky

This study shows results of a radiation microstructure investigation of the baffle-to-former bolt irradiated to 11.4 dpa in real in-service LWR conditions of decommissioned WWER-440 reactor from Greifswald, Germany. The influence of temperature and dose gradients along the bolt was taken into account in the investigation of radiation defects evolution. Since an irradiation temperature about 270C in the bolt head is expected, a significantly higher temperature about 398C is predicted in the end of the bolt due to gamma heating. Also a continuous decrease of neutron dose and dose rate from bolt head towards the bottom of the bolt is present. Three positions along the bolt shank were investigated by TEM: one in each side, and one in the middle of the shank, respectively. Each position was experienced by different irradiation conditions. The TEM observations showed a presence of several radiation-induced defects: Frank dislocation loops, cavities, and Ni-Si rich precipitates. Since the population of Frank loops showed saturated state in each position, the population of cavities and radiation-induced precipitates ascertained specific evolution relatively to irradiation conditions present in particular position of investigation.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceeding of NACE 16th Environmental Degradation Conference of Materials in Nuclear Power Systems – Water Reactors

ISBN

9781510819238

ISSN

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e-ISSN

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Počet stran výsledku

17

Strana od-do

1-17

Název nakladatele

Neuveden

Místo vydání

Neuveden

Místo konání akce

Grove Park Inn in Asheville, NC, USA

Datum konání akce

11. 8. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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