The fixed bed nuclear reactor concept

Şahi̇n, Sümer; Sefidvash, Farhang

doi:10.1016/j.enconman.2007.12.017

Cited by 31 publications

(5 citation statements)

References 13 publications

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“…In previous work, the reactor performance was investigated with low enriched uranium. Calculations have indicated very long plant operation times, such as 7 and 17 years with 9% and 19% enriched 235 UO 2 fuel charges, respectively, for FBNR 1 . The reactor reveals also very high performance to burn thorium.…”

Section: Description Of the Fbnrmentioning

confidence: 99%

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3D Analysis of a multipurpose modular reactor for small energy production

Şahi̇n¹,

Şarer

2020

Int J Energy Res

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Summary The Fixed Bed Nuclear Reactor (FBNR) is a modular reactor for small energy needs (70‐120 MWel). FBNR is pressurized water reactor, but uses GEN‐IV reactors fuel. UO2 kernels of 500 μm diameter with 25 μm thick SiC cladding are embedded in graphite matrix form the spherical fuel elements with a diameter of 15 mm and covered by 300 μm thick Zircaloy‐4 cladding. FBNR has high level safety features and operates without On‐site Refueling. Approximately 1.62 million spherical fuel elements are suspended in a core height of 200 cm and inner and outer diameters of 32 cm and 224 cm by upwards flowing light water coolant with 280°C entry and 340°C exit temperatures. The unit lattice geometry is dodecahedron with fuel element in center and surrounded with light water coolant‐moderator.In the present work, 9% enriched UO2 fuel is used. Neutronic analysis has been performed with the MCNPX‐2.7.0 code. As, it is not practical to tackle millions of fuel elements separately, at first run unit fuel cell calculations are performed in spherical geometry for one single lattice consisting of separate fuel, cladding and volume‐equivalent moderator regions. In the second run, the fuel cell is homogenized. Infinite cell calculations have been executed for variable moderator/fuel (H/235U) ratios in order to determine under‐ and over‐moderated criticality values. The criticality values for the homogenized cell geometry are slightly lower and remains <5% range, that is, on the conservative side, which is acceptable for the purpose of this study. This allows us to homogenize the entire core for the full 3‐D reactor with core and reflector regions. Reactor criticality increases with increasing H/235U ratios in the, under moderated region, where H/235U = 18 is selected for further investigations. Temporal variation of the reactor criticality is pursued for full reactor power of 210 MWth (~70 MWel net) with keff = 1.36 at the beginning of life down to keff = 1.02 over 1260 days with a plant factor of 1.0. The final fuel burn up was found as 57.3 GWd/ton.

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Section: Description Of the Fbnrmentioning

confidence: 99%

“…The unit lattice geometry is dodecahedron with fuel element in center and surrounded with light water coolant‐moderator. Previous work has extensively described the reactor 1,2 …”

Section: Introductionmentioning

confidence: 99%

3D Analysis of a multipurpose modular reactor for small energy production

Şahi̇n¹,

Şarer

2020

Int J Energy Res

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“…Tristructural-isotropic (TRISO) coated fuel particle with spherical ceramic fuel particle kernel followed by three layers of pyrolytic carbon and one layer of silicon carbide (SiC) [5] provides the crucial safety in this nuclear system [6]. The TRISO-type fuel particle also shows great potential applications in other nuclear systems such as molten salt reactor (MSR) [7], gas cooled fast reactor (GFR) [8], and fixed bed nuclear reactor (FBR) [9].…”

Section: Introductionmentioning

confidence: 99%

An improved design of TRISO particle with porous SiC inner layer by fluidized bed-chemical vapor deposition

Liu

Chang

et al. 2015

Journal of Nuclear Materials

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“…The fixed bed nuclear reactor (FBNR) is being developed under the IAEA Coordinated Research Project (CRP) on Small Reactors without On‐site Refueling . The FBNR operates at the 70 MW el capacity, based on the conventional PWR technology, but uses spherical fuel elements, where TRISO particles will be imbedded with fuel kernels in the center.…”

Section: Introductionmentioning

confidence: 99%

“…FBNR can operate both with conventional nuclear fuel 235 U as well as with 233 U and make use of the worldwide abundant thorium on that way . Utilization potential of alternative fuels, such as thorium, reactor grade plutonium, and minor actinides enables FBNR to have a high level of sustainability .…”

Section: Introductionmentioning

confidence: 99%

Reactivity and kinetic parameter evolutions for the core height and boron concentration of the fixed bed nuclear reactor

et al. 2016

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SUMMARY This article focuses on calculation of reactivity and kinetic parameters in different states (different core heights and boron concentrations in the coolant water) of the fixed bed nuclear reactor (FBNR). The numerical calculations are performed with the SRAC code. Uranium dioxide (UO2) with 235U enrichment grade of 5% is used as spherical fuel pellets in the TRISO fuel type. The core height is changed by a core height level limiter. The main results of this study can be summarized as follows: The effective neutron multiplication coefficient is varied with the core height and boron concentration in the coolant water. When there is no‐boron in the coolant water and the core height is over 120 cm, the reactor control can be carried out by the movement of a core height level limiter, without the fine control rods in the core center; but when there is a boron concentration, the reactor may be controlled by the level limiter at the lower core heights. The kinetic parameters (the prompt‐neutron lifetime and effective delayed neutron fraction) of the reactor also are changed to the reactor core height and to the boron concentration in the coolant water. Copyright © 2016 John Wiley & Sons, Ltd.

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The fixed bed nuclear reactor concept

Cited by 31 publications

References 13 publications

3D Analysis of a multipurpose modular reactor for small energy production

3D Analysis of a multipurpose modular reactor for small energy production

An improved design of TRISO particle with porous SiC inner layer by fluidized bed-chemical vapor deposition

Reactivity and kinetic parameter evolutions for the core height and boron concentration of the fixed bed nuclear reactor

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