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

Result code in 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>

Result on the web

<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

—

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

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

Project

—

Continuities

R - Projekt Ramcoveho programu EK

Publication year

2025

Confidentiality

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

Article name in the collection

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

ISBN

979-12-5608-133-2

ISSN

—

e-ISSN

—

Number of pages

7

Pages from-to

807-813

Publisher name

Universita di Pisa

Place of publication

Pisa, Italy

Event location

Pisa, Italy

Event date

Feb 3, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—