Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor

Abstract A novel re-optimization of fuel assembly and new innovative burnable absorber (BA) concepts are investigated in this paper to pursue a high-performance soluble-boron-free (SBF) small modular reactor (SMR), named autonomous transportable on-demand reactor module (ATOM). A truly optimized PWR...

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Autores principales:	Xuan Ha Nguyen, Seongdong Jang, Yonghee Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2f7e5de3a272496ca2d14e6c6af96f16
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spelling	oai:doaj.org-article:2f7e5de3a272496ca2d14e6c6af96f162021-12-02T17:22:57ZTruly-optimized PWR lattice for innovative soluble-boron-free small modular reactor10.1038/s41598-021-92350-52045-2322https://doaj.org/article/2f7e5de3a272496ca2d14e6c6af96f162021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92350-5https://doaj.org/toc/2045-2322Abstract A novel re-optimization of fuel assembly and new innovative burnable absorber (BA) concepts are investigated in this paper to pursue a high-performance soluble-boron-free (SBF) small modular reactor (SMR), named autonomous transportable on-demand reactor module (ATOM). A truly optimized PWR (TOP) lattice concept has been introduced to maximize the neutron economy while enhancing the inherent safety of an SBF pressurized water reactor. For an SBF SMR design, the 3-D centrally-shielded BA (CSBA) design is utilized and another innovative 3-D BA called disk-type BA (DiBA) is proposed in this study. Both CSBA and DiBA designs are investigated in terms of material, spatial self-shielding effects, and thermo-mechanical properties. A low-leakage two-batch fuel management is optimized for both conventional and TOP-based SBF ATOM cores. A combination of CSBA and DiBA is introduced to achieve a very small reactivity swing (< 1000 pcm) as well as a long cycle length and high fuel burnup. For the SBF ATOM core, safety parameters are evaluated and the moderator temperature coefficient is shown to remain sufficiently and similarly negative throughout the whole cycle. It is demonstrated that the small excess reactivity can be well managed by mechanical shim rods with a marginal increase in the local power peaking, and a cold-zero shutdown is possible with a pseudo checker-board control rod pattern. In addition, a thermal–hydraulic-coupled neutronic analysis of the ATOM core is discussed.Xuan Ha NguyenSeongdong JangYonghee KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xuan Ha Nguyen Seongdong Jang Yonghee Kim Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
description	Abstract A novel re-optimization of fuel assembly and new innovative burnable absorber (BA) concepts are investigated in this paper to pursue a high-performance soluble-boron-free (SBF) small modular reactor (SMR), named autonomous transportable on-demand reactor module (ATOM). A truly optimized PWR (TOP) lattice concept has been introduced to maximize the neutron economy while enhancing the inherent safety of an SBF pressurized water reactor. For an SBF SMR design, the 3-D centrally-shielded BA (CSBA) design is utilized and another innovative 3-D BA called disk-type BA (DiBA) is proposed in this study. Both CSBA and DiBA designs are investigated in terms of material, spatial self-shielding effects, and thermo-mechanical properties. A low-leakage two-batch fuel management is optimized for both conventional and TOP-based SBF ATOM cores. A combination of CSBA and DiBA is introduced to achieve a very small reactivity swing (< 1000 pcm) as well as a long cycle length and high fuel burnup. For the SBF ATOM core, safety parameters are evaluated and the moderator temperature coefficient is shown to remain sufficiently and similarly negative throughout the whole cycle. It is demonstrated that the small excess reactivity can be well managed by mechanical shim rods with a marginal increase in the local power peaking, and a cold-zero shutdown is possible with a pseudo checker-board control rod pattern. In addition, a thermal–hydraulic-coupled neutronic analysis of the ATOM core is discussed.
format	article
author	Xuan Ha Nguyen Seongdong Jang Yonghee Kim
author_facet	Xuan Ha Nguyen Seongdong Jang Yonghee Kim
author_sort	Xuan Ha Nguyen
title	Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
title_short	Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
title_full	Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
title_fullStr	Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
title_full_unstemmed	Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor
title_sort	truly-optimized pwr lattice for innovative soluble-boron-free small modular reactor
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2f7e5de3a272496ca2d14e6c6af96f16
work_keys_str_mv	AT xuanhanguyen trulyoptimizedpwrlatticeforinnovativesolubleboronfreesmallmodularreactor AT seongdongjang trulyoptimizedpwrlatticeforinnovativesolubleboronfreesmallmodularreactor AT yongheekim trulyoptimizedpwrlatticeforinnovativesolubleboronfreesmallmodularreactor
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Truly-optimized PWR lattice for innovative soluble-boron-free small modular reactor

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