Analysis of Void Reactivity Coefficient for 3D BWR Assembly Model. (24th August 2016)

• Record Type: Journal Article
• Authors: Slavickas, Andrius; Pabarčius, Raimondas; Tonkūnas, Aurimas; Ušpuras, Eugenijus
• Other Names: Miró Rafael Academic Editor.
• Is Part Of: Science and technology of nuclear installations. Volume 2016(2016)
• Publication Date: 2016-08-24
• Subjects: Nuclear engineering -- Periodicals; Nuclear facilities -- Periodicals; Nuclear engineering; Nuclear facilities; Electronic journals; Periodicals; 621.48
• DOI: 10.1155/2016/3427549
• Languages: English
• ISSNs: 1687-6075

Abstract

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.