Analysis of Void Reactivity Coefficient for 3D BWR Assembly Model

Author:

Slavickas Andrius1ORCID,Pabarčius Raimondas1,Tonkūnas Aurimas1,Ušpuras Eugenijus1ORCID

Affiliation:

1. Lithuanian Energy Institute, Breslaujos Street 3, LT-44403 Kaunas, Lithuania

Abstract

The effect of BWR fuel assembly 3D model on void reactivity coefficient (VRC) estimation is investigated. VRC values were calculated for different BWR assembly models applying deterministic T-NEWT and Monte Carlo KENO-VI functional modules of SCALE 6.1 code package. The difference between deterministic T-NEWT and Monte Carlo KENO-VI simulations is negligible (0.18 pcm/%). The influence of the assumed more detailed coolant density profile was estimated as well. VRC increases with the application of a larger number of coolant density values across fuel assembly height. It was shown that the coolant density profile described by 6 values per height could be considered sufficient from prospect of VRC estimation, as a more detailed density profile has impact below 1% on total assembly void effects. VRC values were decomposed to values for individual nodes and isotopes, since decomposition provides useful insights to describe the overall behaviour of VRC in detail.

Publisher

Hindawi Limited

Subject

Nuclear Energy and Engineering

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