Treatment and evaluation of surface roughness of fuel cladding for heat transfer experiments in supercritical fluids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F25%3AN0000104" target="_blank" >RIV/26722445:_____/25:N0000104 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.torrossa.com/en/resources/an/5913204#" target="_blank" >https://www.torrossa.com/en/resources/an/5913204#</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Treatment and evaluation of surface roughness of fuel cladding for heat transfer experiments in supercritical fluids

Popis výsledku v původním jazyce

Supercritical Water Cooled Small Modular Reactors (SCW SMR) are currently in development. A promising pre concept was introduced through the international ECC SMART project. While supercritical water (SCW) is a highly advantageous coolant, it also presents challenges, notably deteriorated heat transfer. The fuel cladding is the primary safety barrier in SCW SMR, making it a focal point of ongoing research. The phenomenon of deteriorated heat transfer (DHT) is influenced by the thermodynamic properties of water, which cha nge significantly near the critical point, as well as by the thermophysical properties of the structural materials utilized. Furthermore, the surface roughness of the fuel cladding also plays a critical role, as it is affected by corrosion processes that might be changed over the fuel cycle. To enhance the understanding of DHT heat transfer phenomena, thermohydraulic experiments were proposed in the ECC SMART project. Several surface treatment methods were tested and evaluated using specimens made from tube s corresponding to the dimensions of fuel cladding. This was complemented by long term exposure of candidate materials under simulated SCW SMR operating conditions to monitor changes in surface roughness. In summary, tubes measuring 4 meters in length with artificially treated inner surface roughness were produced. One tube specimen had a smooth surface for reference, while the other was rough. Surface roughness measurements were conducted using both contact and non contact profilometers. This paper will pr ovide a detailed overview of the various surface treatment methods, surface roughness parameters, and the treatment procedures for the artificial inner surfaces of the extended tubes.

Název v anglickém jazyce

Treatment and evaluation of surface roughness of fuel cladding for heat transfer experiments in supercritical fluids

Popis výsledku anglicky

Supercritical Water Cooled Small Modular Reactors (SCW SMR) are currently in development. A promising pre concept was introduced through the international ECC SMART project. While supercritical water (SCW) is a highly advantageous coolant, it also presents challenges, notably deteriorated heat transfer. The fuel cladding is the primary safety barrier in SCW SMR, making it a focal point of ongoing research. The phenomenon of deteriorated heat transfer (DHT) is influenced by the thermodynamic properties of water, which cha nge significantly near the critical point, as well as by the thermophysical properties of the structural materials utilized. Furthermore, the surface roughness of the fuel cladding also plays a critical role, as it is affected by corrosion processes that might be changed over the fuel cycle. To enhance the understanding of DHT heat transfer phenomena, thermohydraulic experiments were proposed in the ECC SMART project. Several surface treatment methods were tested and evaluated using specimens made from tube s corresponding to the dimensions of fuel cladding. This was complemented by long term exposure of candidate materials under simulated SCW SMR operating conditions to monitor changes in surface roughness. In summary, tubes measuring 4 meters in length with artificially treated inner surface roughness were produced. One tube specimen had a smooth surface for reference, while the other was rough. Surface roughness measurements were conducted using both contact and non contact profilometers. This paper will pr ovide a detailed overview of the various surface treatment methods, surface roughness parameters, and the treatment procedures for the artificial inner surfaces of the extended tubes.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Projekt

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Návaznosti

R - Projekt Ramcoveho programu EK

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

11th International symposium on supercritical water-cooled reactors : Pisa, Italy, February 3-5, 2025

ISBN

979-12-5608-133-2

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

807-813

Název nakladatele

Universita di Pisa

Místo vydání

Pisa, Italy

Místo konání akce

Pisa, Italy

Datum konání akce

3. 2. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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