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Analysis and design of a 333 mwth marine pwr core using mixed d2o-h2o coolant and thorium-based checkerboard micro-heterogeneous and all-uranium fuel

Alam, SB and Mohamed, H and Lindley, BA and Parks, GT (2016) Analysis and design of a 333 mwth marine pwr core using mixed d2o-h2o coolant and thorium-based checkerboard micro-heterogeneous and all-uranium fuel. In: UNSPECIFIED pp. 1678-1686..

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Abstract

In this reactor physics study, we attempt to de-sign a soluble-boron-free (SBF) PWR civil marine re- Actor core that can operate over a 20 effective-full-power-years life at 333 MWth using mixed D 2 O-H 2 O coolant. We use WIMS to develop subassembly de-signs and PANTHER to examine whole-core arrange- ments, optimizing: subassembly and core geometry; fuel enrichment; burnable and moveable poison de-sign; and whole-core loading patterns. In this study, we use 15% U-235 enriched UO 2 and 18% enriched micro-heterogeneous ThO 2 -UO 2 duplex fuel arranged in a simple checkerboard configuration. Comparisons are made between the homogeneously mixed 15% U-235 enriched all-UO 2 case and the checkerboard con-figuration with high thickness ZrB 2 integral fuel burn- Able absorber pins for reactivity control. Taking ad- vantage of self-shielding effects, the checkerboard op-tion shows greater promise in the final burnable poi-son design while maintaining low, stable reactivity with minimal burnup penalty. For the final poison design with ZrB 2 , the checkerboard contributes 2.5% more initial reactivity suppression, although the all-UO 2 design exhibits lower reactivity swing. All the candidate materials show greater rod worth for the checkerboard design. For both fuels, B 4 C has the highest reactivity worth, providing 3% higher control rod worth for checkerboard fuel than all-UO 2 . Fi-nally, optimized assemblies were loaded into a 3D re- Actor model in PANTHER. The PANTHER results show that the designed cores can achieve the target core lifetime of 20 years, confirming the fissile load-ing is well-designed.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 03 Aug 2017 03:08
DOI: