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Enhancing plutonium incineration in the thorium-based I<sup>2</sup>S-LWR design with loading pattern optimization

Kotlyar, D and Parks, GT (2016) Enhancing plutonium incineration in the thorium-based I<sup>2</sup>S-LWR design with loading pattern optimization. Annals of Nuclear Energy, 96. pp. 401-411. ISSN 0306-4549

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Abstract

© 2016 The Author(s) This paper presents an optimization of a thorium–plutonium fuel cycle, through a multi-batch reloading scheme, developed for the Integral Inherently Safe Light Water Reactor (I 2 S-LWR). The I 2 S-LWR is an advanced 2850 MWt integral pressurized water reactor with enhanced safety beyond that of Gen-III+ reactors. Its baseline fuel and cladding materials are U 3 Si 2 and advanced FeCrAl steel, respectively. The advanced steel cladding can withstand longer exposure periods with significantly lower degradation rates compared to traditional Zr-based alloys. In principle, increasing the number of batches allows higher discharge burnups and thus deeper Pu and transuranic elements incineration to be achieved. Therefore, various refuelling strategies were considered in this study, namely 3-, 5- and 7.56-batch schemes. The Simulated Annealing optimization technique was applied for the different batch schemes to obtain the most favourable loading pattern with respect to cycle length performance. The results confirm that increasing the number of batches allows the discharge burnup to be increased by 20% (above 100 MWd/kg), which improves the Pu incineration performance. In addition, the increased number of batches improves the reactivity coefficients without violating the power peaking factors limits.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:01
Last Modified: 21 Nov 2017 03:16
DOI: