Unmoderated molten salt reactors design optimisation for power stability

被引：4

作者：

Laureau, A. ^{[1
,2
]}

Belle, A. ^{[3
,4
]}

Allibert, M. ^{[2
]}

Heuer, D. ^{[2
]}

Merle, E. ^{[2
]}

Pautz, A. ^{[3
,5
]}

机构：

[1] IMT Atlantique, SUBATECH, CNRS IN2P3, F-44307 Nantes, France

[2] Univ Grenoble Alpes, LPSC, CNRS IN2P3, 53 Rue Martyrs, F-38026 Grenoble, France

[3] Ecole Polytech Fed Lausanne EPFL, LRS, CH-1015 Lausanne, Switzerland

[4] Univ Paris Saclay, Lab Genie Ind, Cent Supelec, Chair Risk & Resilience Complex Syst, Gif Sur Yvette, France

[5] Paul Scherrer Inst PSI, Nucl Energy & Safety Res Div NES, CH-5232 Villigen, Switzerland

来源：

ANNALS OF NUCLEAR ENERGY | 2022年 / 177卷

关键词：

DES; Turbulence; Reactivity fluctuation; Core design; Molten salt reactor;

D O I：

10.1016/j.anucene.2022.109265

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The critical region of unmoderated molten salt reactors consists in a cavity filled with a liquid fuel. The lack of internal structure implies a complex flow structure of the circulating fuel salt. A preliminary core shape optimization has been performed during the EVOL European project to limit recirculation and hotspots. This optimization was based on a Reynolds Averaged Navier Stokes (RANS) approach, but the latter only provides time-averaged values for velocity and temperature. However, the power stability is sensitive to thermal fluctuations induced by the flow turbulence itself, even at steady state without pump flow rate or heat extraction variation. This phenomenon is studied using a Detached Eddies Simulation approach to solve the turbulence in the reactor and get a time dependent temperature distribution and then the reactivity fluctuations. A new geometry is proposed to limit the total power fluctuations from 7.5% for the preconceptual EVOL geometry down to 1.2%. (C) 2022 Published by Elsevier Ltd.

引用

页数：8

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