Influence of Relative Power Difference Weighting on Convergence of Coupled Neutronic Thermal-Hydraulic Calculations of Heavy Water Small Modular Reactor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21730%2F23%3A00377188" target="_blank" >RIV/68407700:21730/23:00377188 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.13182/NURETH20-40816" target="_blank" >https://doi.org/10.13182/NURETH20-40816</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13182/NURETH20-40816" target="_blank" >10.13182/NURETH20-40816</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Relative Power Difference Weighting on Convergence of Coupled Neutronic Thermal-Hydraulic Calculations of Heavy Water Small Modular Reactor

Popis výsledku v původním jazyce

A heavy water reactor with pressure tubes contains a low-pressure moderator system separated from a pressurized coolant system. The moderator is heated from radiation heating during the reactor full power operation where the heat is approximately 5 % of the reactor power. The present study deals with full-core multi-physics calculations using coupled neutronic and thermal-hydraulics codes on a heavy water small modular reactor (SMR) concept for district heating applications. The full-core coupled calculations are realized using Picard iterations. The main objective of the study is to analyze the convergence of coupled calculations with particular interest on power difference weighting. The power distribution difference in fuel is weighted with a relative power of fuel pins and several methods are analyzed for weighting of heat generated in the moderator. The evaluation of heat distribution difference in the moderator is crucial for overall convergence of coupled calculations as a small difference in the moderator heat source would lead to a change of temperature and flow fields and a slow convergence, especially for a buoyant dominated flow in the moderator vessel. 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

Název v anglickém jazyce

Influence of Relative Power Difference Weighting on Convergence of Coupled Neutronic Thermal-Hydraulic Calculations of Heavy Water Small Modular Reactor

Popis výsledku anglicky

A heavy water reactor with pressure tubes contains a low-pressure moderator system separated from a pressurized coolant system. The moderator is heated from radiation heating during the reactor full power operation where the heat is approximately 5 % of the reactor power. The present study deals with full-core multi-physics calculations using coupled neutronic and thermal-hydraulics codes on a heavy water small modular reactor (SMR) concept for district heating applications. The full-core coupled calculations are realized using Picard iterations. The main objective of the study is to analyze the convergence of coupled calculations with particular interest on power difference weighting. The power distribution difference in fuel is weighted with a relative power of fuel pins and several methods are analyzed for weighting of heat generated in the moderator. The evaluation of heat distribution difference in the moderator is crucial for overall convergence of coupled calculations as a small difference in the moderator heat source would lead to a change of temperature and flow fields and a slow convergence, especially for a buoyant dominated flow in the moderator vessel. 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/TN02000012" target="_blank" >TN02000012: Centrum pokročilých jaderných technologií II</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20)

ISBN

978-0-89448-793-4

ISSN

—

e-ISSN

—

Počet stran výsledku

12

Strana od-do

999-1010

Název nakladatele

American Nuclear Society, Inc.

Místo vydání

Illinois

Místo konání akce

Washington DC

Datum konání akce

20. 8. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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