EFFECT OF FISSION PRODUCTS ON EQUILIBRIUM U-Pu AND Th-U CYCLES FOR 16 SELECTED REACTORS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00381293" target="_blank" >RIV/68407700:21340/24:00381293 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1115/ICONE31-136232" target="_blank" >http://dx.doi.org/10.1115/ICONE31-136232</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/ICONE31-136232" target="_blank" >10.1115/ICONE31-136232</a>

Jazyk výsledku

angličtina

Název v původním jazyce

EFFECT OF FISSION PRODUCTS ON EQUILIBRIUM U-Pu AND Th-U CYCLES FOR 16 SELECTED REACTORS

Popis výsledku v původním jazyce

Three papers related to the equilibrium fuel cycle in 16 selected reactors were submitted to ICONE 31 conference. In this second part, the impact of fission products on the equilibrium is discussed. For each of the 16 reactors in the U-Pu and Th-U cycle and in the infinite lattice, the once-through depletion was calculated with a specific share of fission products. During the calculation, the total number of actinides was kept in balance in a closed cycle, only the proportion of fission products grew. In the second step, two possible approximations for multi-batch operation were compared: linear theory of reactivity and equilibrium approximation. It was found that the equilibrium does not differ so much with burnup, significant changes were seen only in thermal systems in the U-Pu cycle. Since actinides were kept in equilibrium, only a decrease in reactivity was observed, which was purely linear for fast systems and nonlinear for thermal systems. When comparing both approximations, it turned out that they do not fit. In all cases, the equilibrium approximation stabilizes the different concentrations of long-lived and stable fission products, which results in a decrease in parasitic absorption and in an increase in reactivity. For this reason, the paper further analyses the concentration of selected fission products between each other. All results were obtained using the EQL0D v4 procedure and with ENDF/B-VIII.0 nuclear data library.

Název v anglickém jazyce

EFFECT OF FISSION PRODUCTS ON EQUILIBRIUM U-Pu AND Th-U CYCLES FOR 16 SELECTED REACTORS

Popis výsledku anglicky

Three papers related to the equilibrium fuel cycle in 16 selected reactors were submitted to ICONE 31 conference. In this second part, the impact of fission products on the equilibrium is discussed. For each of the 16 reactors in the U-Pu and Th-U cycle and in the infinite lattice, the once-through depletion was calculated with a specific share of fission products. During the calculation, the total number of actinides was kept in balance in a closed cycle, only the proportion of fission products grew. In the second step, two possible approximations for multi-batch operation were compared: linear theory of reactivity and equilibrium approximation. It was found that the equilibrium does not differ so much with burnup, significant changes were seen only in thermal systems in the U-Pu cycle. Since actinides were kept in equilibrium, only a decrease in reactivity was observed, which was purely linear for fast systems and nonlinear for thermal systems. When comparing both approximations, it turned out that they do not fit. In all cases, the equilibrium approximation stabilizes the different concentrations of long-lived and stable fission products, which results in a decrease in parasitic absorption and in an increase in reactivity. For this reason, the paper further analyses the concentration of selected fission products between each other. All results were obtained using the EQL0D v4 procedure and with ENDF/B-VIII.0 nuclear data library.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

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

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of 31st International Conference on Nuclear Engineering

ISBN

978-0-7918-8822-3

ISSN

—

e-ISSN

—

Počet stran výsledku

10

Strana od-do

—

Název nakladatele

American Society of Mechanical Engineers - ASME

Místo vydání

New York

Místo konání akce

Praha

Datum konání akce

4. 8. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001349536700057