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  • 1.
    Alam, Syed Bahauddin
    et al.
    Univ Cambridge, Dept Engn, Cambridge, England; Rhode Isl Nucl Sci Ctr, Narragansett, RI USA; French Alternat Energies & Atom Energy Commiss, St Paul Les Durance, France.
    Kumar, Dinesh
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik. French Alternat Energies & Atom Energy Commiss, St Paul Les Durance, France.
    Almutairi, B.
    Rhode Isl Nucl Sci Ctr, Narragansett, RI USA; Missouri S&T, Dept Nucl Engn, Rolla, MO USA.
    Bhowmik, P. K.
    Missouri S&T, Dept Nucl Engn, Rolla, MO USA.
    Goodwin, C.
    Rhode Isl Nucl Sci Ctr, Narragansett, RI USA.
    Parks, G. T.
    Univ Cambridge, Dept Engn, Cambridge, England.
    Small modular reactor core design for civil marine propulsion using micro-heterogeneous duplex fuel. Part I: Assembly-level analysis2019Ingår i: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 346, s. 157-175Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In an effort to de-carbonise commercial freight shipping, there is growing interest in the possibility of using nuclear propulsion systems. In this reactor physics study, we seek to design a soluble-boron-free (SBF) and low-enriched uranium (LEU) (<20% U-235 enrichment) civil nuclear marine propulsion small modular reactor (SMR) core that provides at least 15 effective full-power-years (EFPY) life at 333 MWth using 18% U-235 enriched micro-heterogeneous ThO2-UO2 duplex fuel and 15% U-235 enriched homogeneously mixed all-UO2 fuel. We use WIMS to develop subassembly designs and PANTHER to examine whole-core arrangements.

    The assembly-level behaviours of candidate burnable poison (BP) materials and control rods are investigated. We examine gadolinia (Gd2O3), erbia (Er2O3) and ZrB2 integral fuel burnable absorber (IFBA) as BPs. We arrive at a design with the candidate fuels loaded into 13 x 13 assemblies using IFBA pins for reactivity control. Taking advantage of self-shielding effects, this design maintains low and stable assembly reactivity with relatively little burnup penalty. Thorium-based duplex fuel offers better performance than all-UO2 fuel with all BP options considered. Duplex fuel has similar to 20% lower reactivity swing and, in consequence, lower initial reactivity than all-UO2 fuel. The lower initial reactivity and smaller reactivity swing make the task of reactivity control through BP design easier in the thorium-rich duplex core. For control rod design, we examine boron carbide (B4C), hafnium, and Ag-In-Cd alloy. All the candidate materials exhibit greater rod worth for the duplex design. For both fuels, B4C has the highest rod worth. In particular, one of the major objectives of this study is to offer/explore a thorium-based candidate alternative fuel platform for the proposed marine core. It is proven by literature reviews that the ability of the duplex fuel was never explored in the context of a single-batch, LEU, SBF, long-life SMR core. In this regard, the motivation of this paper is to observe the neutronic performance of the proposed duplex fuel with respect to the UO2 fuel and 'open the option' of designing the functional cores with both the duplex and UO2 fuel cores.

  • 2.
    Alam, Syed Bahauddin
    et al.
    Univ Cambridge, Dept Engn, Cambridge, England; Rhode Isl Nucl Sci Ctr, Narragansett, RI USA; French Alternat Energies & Atom Energy Commiss, Saint Paul Lez Durance, France.
    Ridwan, T.
    Univ Cambridge, Dept Engn, Cambridge, England.
    Kumar, Dinesh
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik. French Alternat Energies & Atom Energy Commiss, Saint Paul Lez Durance, France.
    Almutairi, B.
    Rhode Isl Nucl Sci Ctr, Narragansett, RI USA; Missouri S&T, Dept Nucl Engn, Rolla, MO USA.
    Goodwin, C.
    Rhode Isl Nucl Sci Ctr, Narragansett, RI USA.
    Parks, G. T.
    Univ Cambridge, Dept Engn, Cambridge, England.
    Small modular reactor core design for civil marine propulsion using micro-heterogeneous duplex fuel. Part II: whole-core analysis2019Ingår i: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 346, s. 176-191Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Civil marine reactors face a unique set of design challenges. These include requirements for a small core size and long core lifetime, a 20% cap on fissile loading, and limitations on using soluble neutron absorbers. In this reactor physics study, we seek to design a core that meets these requirements over a 15 effective full-power-years (EFPY) life at 333 MWth using homogeneously mixed all-UO2 and micro-heterogeneous ThO2-UO2 duplex fuels. In a companion (Part I) paper, we found assembly designs using 15% and 18% U-235 for UO2 and duplex fuels, respectively, loaded into 13 x 13 pin arrays. High thickness (150 mu m) ZrB2 integral fuel burnable absorber (IFBA) pins and boron carbide (B4C) control rods are used for reactivity control. Taking advantage of self-shielding effects, these designs maintain low and stable assembly reactivity with little burnup penalty.

    In this paper (Part II), whole-core design analyses are performed for small modular reactor (SMR) to determine whether the core remains critical for at least 15 EFPY with a reactivity swing of less than 4000 pcm, subject to appropriate constraints. The main challenge is to keep the radial form factor below its limit (1.50). Burnable poison radial-zoning is examined in the quest for a suitable arrangement to control power peaking. Optimized assemblies are loaded into a 3D reactor model in PANTHER. The PANTHER results confirm that the fissile loadings of both fuels are well-designed for the target lifetime: at the end of the (similar to)15-year cycle, the cores are on the border of criticality. The duplex fuel core can achieve (similar to)4% longer core life, has a (similar to)3% lower initial reactivity and (similar to)30% lower reactivity swing over life than the final UO2 core design. The duplex core is therefore the more successful design, giving a core life of (similar to)16 years and a reactivity swing of less than 2500 pcm, while satisfying all the neutronic safety parameters. In particular, one of the major objectives of this study is to offer/explore a thorium-based candidate alternative fuel platform for the proposed marine core. It is proven by literature reviews that the ability of the duplex fuel was never explored in the context of a single-batch, LEU, SBF, long-life SMR core. In this regard, the motivation of this paper is to understand the underlying physics of the duplex fuel and 'open the option' of designing the functional cores with both the duplex and UO2 fuel cores.

  • 3.
    Kumar, Dinesh
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik.
    Alam, Syed Bahauddin
    CEA Cadarache.
    Uncertainty Quantification and Robust Optimization in Engineering2019Ingår i: Visual Computing -: Advancing Engineering Practice / [ed] Dean Vucinic, Germany: Springer, 2019Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 4.
    Kumar, Dinesh
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik. CEA Cadarache, France.
    Sjöstrand, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik.
    Alam, Syed Bahauddin
    CEA Cadarache, France.
    Palau, J. M.
    CEA Cadarache, France.
    De Saint Jean, Cyrille
    Analysis of the prior nuclear data correlation and its effect on the adjustment in Bayesian inference2019Konferensbidrag (Övrigt vetenskapligt)
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