Numerically efficient determination of kinetic parameters of the VR-1 nuclear reactor based on experimental data and ODE-constrained optimization

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F25%3A00378066" target="_blank" >RIV/68407700:21230/25:00378066 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/25:00378066

Výsledek na webu

<a href="https://doi.org/10.1016/j.anucene.2024.111023" target="_blank" >https://doi.org/10.1016/j.anucene.2024.111023</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.anucene.2024.111023" target="_blank" >10.1016/j.anucene.2024.111023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Numerically efficient determination of kinetic parameters of the VR-1 nuclear reactor based on experimental data and ODE-constrained optimization

Popis výsledku v původním jazyce

A method of adjusting nuclear reactor kinetic parameters to experimental data is proposed. The fractions of neutrons delayed via different precursor groups are of interest. Their values originally calculated by Monte Carlo simulations are modified to bring the power output of the reactor predicted by the point kinetics equations closer to the measured values. The measurements were performed on the VR-1 zero-power training reactor in the Czech Republic. Three reactivity patterns were investigated to account for the different reactor transients. The resulting ODE-constrained optimization problem is solved numerically, using the adjoint equations to obtain the gradient of the loss functional and applying a specifically tailored gradient descent technique. The performance of our approach is compared to other variants of gradient-based optimization. As a side result, a gradient descent step size adaptivity algorithm is proposed. Finally, discussion on the physical relevance of the obtained results is provided.

Název v anglickém jazyce

Numerically efficient determination of kinetic parameters of the VR-1 nuclear reactor based on experimental data and ODE-constrained optimization

Popis výsledku anglicky

A method of adjusting nuclear reactor kinetic parameters to experimental data is proposed. The fractions of neutrons delayed via different precursor groups are of interest. Their values originally calculated by Monte Carlo simulations are modified to bring the power output of the reactor predicted by the point kinetics equations closer to the measured values. The measurements were performed on the VR-1 zero-power training reactor in the Czech Republic. Three reactivity patterns were investigated to account for the different reactor transients. The resulting ODE-constrained optimization problem is solved numerically, using the adjoint equations to obtain the gradient of the loss functional and applying a specifically tailored gradient descent technique. The performance of our approach is compared to other variants of gradient-based optimization. As a side result, a gradient descent step size adaptivity algorithm is proposed. Finally, discussion on the physical relevance of the obtained results is provided.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Annals of Nuclear Energy

ISSN

0306-4549

e-ISSN

1873-2100

Svazek periodika

211

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

001354844300001

EID výsledku v databázi Scopus

2-s2.0-85208227810