CUED Publications database

Core design options for high conversion BWRs operating in Th-<sup>233</sup>U fuel cycle

Shaposhnik, Y and Shwageraus, E and Elias, E (2013) Core design options for high conversion BWRs operating in Th-<sup>233</sup>U fuel cycle. Nuclear Engineering and Design, 263. pp. 193-205. ISSN 0029-5493

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Several options of fuel assembly design are investigated for a BWR core operating in a closed self-sustainable Th- 233 U fuel cycle. The designs rely on an axially heterogeneous fuel assembly structure consisting of a single axial fissile zone "sandwiched" between two fertile blanket zones, in order to improve fertile to fissile conversion ratio. The main objective of the study was to identify the most promising assembly design parameters, dimensions of fissile and fertile zones, for achieving net breeding of 233 U. The design challenge, in this respect, is that the fuel breeding potential is at odds with axial power peaking and the core minimum critical power ratio (CPR), hence limiting the maximum achievable core power rating. Calculations were performed with the BGCore system, which consists of the MCNP code coupled with fuel depletion and thermo-hydraulic feedback modules. A single 3-dimensional fuel assembly having reflective radial boundaries was modeled applying simplified restrictions on the maximum centerline fuel temperature and the CPR. It was found that axially heterogeneous fuel assembly design with a single fissile zone can potentially achieve net breeding, while matching conventional BWR core power rating under certain restrictions to the core loading pattern design. © 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:14
Last Modified: 28 Dec 2017 01:50