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

Result code in 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>

Alternative codes found

RIV/68407700:21340/19:00333211

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

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

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Nuclear Science and Techniques

ISSN

1001-8042

e-ISSN

2210-3147

Volume of the periodical

30

Issue of the periodical within the volume

8

Country of publishing house

SG - SINGAPORE

Number of pages

14

Pages from-to

1-14

UT code for WoS article

000476524000001

EID of the result in the Scopus database

2-s2.0-85069510603