Impacts of an ATF cladding on neutronic performances of the soluble‐boron‐free ATOM core

Nguyen, Xuan Ha; Jang, Seongdong; Kim, Yong Hee

doi:10.1002/er.5322

Cited by 11 publications

(8 citation statements)

References 14 publications

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“…In order to investigate the cycle length and discharge burnup for a two-batch fuel management (FM), a linear reactivity model [11] is used and the results are given in Table II, in which it is assumed that neutron leakage is 7,000 pcm. One can see that the cycle length and discharge burnup increase noticeably with a slight increase in the HTU ratio from the reference one.…”

Section: Maximization Of the Neutron Economymentioning

confidence: 99%

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Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Nguyen

Jang

Kim

2021

Preprint

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A novel re-optimization of fuel assembly (FA) 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 (<1,000 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.

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Section: Maximization Of the Neutron Economymentioning

confidence: 99%

“…Note that each FA has a single CSBA and DiBA design for simplicity. An accidenttolerant-fuel (ATF) cladding, Cr15Al-coated Zir-4, is also utilized for improved safety of the reactor [11], in which the Cr15Al coating thickness is 30 micron.…”

Section: The Atom Core Designmentioning

confidence: 99%

Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Nguyen

Jang

Kim

2021

Preprint

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“…The high concentration of boric acid at the BOL increases the moderator temperature coefficient's positivity (MTC) 6 . Therefore, there is an approach for soluble‐boron‐free reactors regarding cheaper operation costs and inherently operation safety 7,8 . Materials with a high neutron absorption cross‐section, such as gadolinia and erbia, are burnable absorbers.…”

Section: Introductionmentioning

confidence: 99%

“…6 Therefore, there is an approach for soluble-boron-free reactors regarding cheaper operation costs and inherently operation safety. 7,8 Materials with a high neutron absorption cross-section, such as gadolinia and erbia, are burnable absorbers. These materials insert a negative reactivity after the radiative capture.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a new approach for regulating the reactivity and achieving economic feasibility using thorium in a blanket‐seed assembly of pressurized water reactors

Elazaka

Тихомиров

Savander

et al. 2021

Intl J of Energy Research

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Summary The traditional methods for controlling reactor excess reactivity are expensive and have defects during reactor operation. By altering the fuel structure and fissile material distribution, this work presents a new technique for managing excess reactivity at the start of the fuel life. MCNPX code edition 2.7 was used to investigate the neutronic characteristics of the suggested blanket‐seed assembly models and compare them with the reference PWR fuel assembly. Instead of U‐238, Th‐232 was suggested as a fertile nuclide. The impact of the proposed models on the infinite multiplication factor, fuel component concentrations, reactor‐grade plutonium, minor actinides, radial flux of thermal neutrons, and the radial distribution of power has been analyzed. The safety parameters, including the control rods worth, Doppler effect, moderator temperature reactivity coefficients, and the effective delayed neutron fraction, have been studied to reach the most optimum fuel structure.

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“…This paper is concerned with a PWR-type SMR, named Autonomous Transportable on-demand Reactor Module (ATOM), which is currently under development at Korea Advanced Institute of Science and Technology (KAIST) in Korea 7 , 12 . The standard FA design was first adopted in the early ATOM cores.…”

Section: Introductionmentioning

confidence: 99%

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

Nguyen

Jang

Kim

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Impacts of an ATF cladding on neutronic performances of the soluble‐boron‐free ATOM core

Cited by 11 publications

References 14 publications

Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Investigation of a new approach for regulating the reactivity and achieving economic feasibility using thorium in a blanket‐seed assembly of pressurized water reactors

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

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Impacts of an ATF cladding on neutronic performances of the soluble‐boron‐free ATOM core

Cited by 11 publications

References 14 publications

Truly-Optimized PWR&nbsp;Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Truly-Optimized PWR&nbsp;Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Investigation of a new approach for regulating the reactivity and achieving economic feasibility using thorium in a blanket‐seed assembly of pressurized water reactors

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

Contact Info

Product

Resources

About

Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor

Truly-Optimized PWR Lattice for Innovative Soluble-Boron-Free Small Modular Reactor