Recommended strategy and limitations of burnable absorbers used in VVER fuel assemblies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F19%3AN0000014" target="_blank" >RIV/46356088:_____/19:N0000014 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/19:00333211

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs41365-019-0651-x" target="_blank" >https://link.springer.com/article/10.1007%2Fs41365-019-0651-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s41365-019-0651-x" target="_blank" >10.1007/s41365-019-0651-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Recommended strategy and limitations of burnable absorbers used in VVER fuel assemblies

Popis výsledku v původním jazyce

There is an obvious effort to increase the burn up of used fuel assemblies in order to improve fuel utilization. A more effective operation can be realized by extending the fuel cycles or by increasing the number of reloadings. This change is nevertheless connected with increasing the uranium enrichment even above 5% of U-235. Burnable absorbers are widely used to compensate for the positive reactivity of fresh fuel. With proper optimization, burnable absorbers decrease the reactivity excess at the beginning of the cycle, and they can help with stabilization of power distribution. This paper describes properties of several materials that can be used as burnable absorbers. The change in concentration or position of the pin with a burnable absorber in a fuel assembly was analyzed by the HELIOS transport lattice code. The multiplication factor and power peaking factor dependence on fuel burn up were used to evaluate the neutronic properties of burnable absorbers. The following four different materials are discussed in this paper: Gd2O3, IFBA, Er2O3, and Dy2O3. Gadolinium had the greatest influence on fuel characteristics. The number of pins with a burnable absorber was limited in the VVER-440 fuel assembly to six. In the VVER-1000 fuel assembly, 36 pins with a burnable absorber can be used as the assembly is larger. The erbium depletion rate was comparable with uranium burn up. Dysprosium had the largest parasitic absorption after depletion.

Název v anglickém jazyce

Recommended strategy and limitations of burnable absorbers used in VVER fuel assemblies

Popis výsledku anglicky

There is an obvious effort to increase the burn up of used fuel assemblies in order to improve fuel utilization. A more effective operation can be realized by extending the fuel cycles or by increasing the number of reloadings. This change is nevertheless connected with increasing the uranium enrichment even above 5% of U-235. Burnable absorbers are widely used to compensate for the positive reactivity of fresh fuel. With proper optimization, burnable absorbers decrease the reactivity excess at the beginning of the cycle, and they can help with stabilization of power distribution. This paper describes properties of several materials that can be used as burnable absorbers. The change in concentration or position of the pin with a burnable absorber in a fuel assembly was analyzed by the HELIOS transport lattice code. The multiplication factor and power peaking factor dependence on fuel burn up were used to evaluate the neutronic properties of burnable absorbers. The following four different materials are discussed in this paper: Gd2O3, IFBA, Er2O3, and Dy2O3. Gadolinium had the greatest influence on fuel characteristics. The number of pins with a burnable absorber was limited in the VVER-440 fuel assembly to six. In the VVER-1000 fuel assembly, 36 pins with a burnable absorber can be used as the assembly is larger. The erbium depletion rate was comparable with uranium burn up. Dysprosium had the largest parasitic absorption after depletion.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Nuclear Science and Techniques

ISSN

1001-8042

e-ISSN

2210-3147

Svazek periodika

30

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

SG - Singapurská republika

Počet stran výsledku

14

Strana od-do

1-14

Kód UT WoS článku

000476524000001

EID výsledku v databázi Scopus

2-s2.0-85069510603