Investigation of Absorber Concentration Changes During Maneuvering Operation in VVER 1000 Reactor

R., S.K. Anisur; Uvakin, M. A.

doi:10.26583/gns-2020-02-06

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…The use of burnable poisons incorporated into the fuel can decrease these negative consequences extensively by increasing the period of the campaign. In WWER-type reactors, strong burnable absorber «gadolinium» is located in the fuel assemblies in the form of oxide (Gd 2 O 3 ), the concentration varies within 5-8% by weight [1][2][3]. Gadolinium has time to burn up during the first campaign due to the high absorption cross section.…”

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confidence: 99%

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Rahman,

Uvakin,

Hossen

2024

GNS

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In a WWER-type pressurized water reactor, high-neutron-absorbing materials can compensate for the excess reactivity. Theoretical and computational analyses were conducted in this article to use burnable absorbers placed in a fuel rod to reduce the reactivity margin for extending refueling time for WWER-type reactors. To investigate the reduction of the reactivity margin, the fuel burnup calculation was performed without a burnable absorber and with a combination of a variety of burnable absorbers, namely natural Gadolinium (Gd) and Erbium (Er), applying a simplified GETERA program. The calculation found that the variation of the quantity of the burnable absorber (Gd, Er) inside the fuel assemblies governs the reactivity margin for the fuel burnup and increases the efficiency of Uranium fuel (UO2). The combined use of Gd and Er leads to a smoother decrease in reactor reactivity due to a smaller Er absorption cross section, which makes it possible to reduce the total mass of Gd in the fuel element and reduce the blocking effect. In the calculation, Gd concentrations employed in the computation at 1.5% and 3%, while Er concentrations were used within the range of 0.1%–0.6%.

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Section: Introductionmentioning

confidence: 99%

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Rahman,

Uvakin,

Hossen

2024

GNS

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Investigation of the power peaking factor K_rin the fuel assembly during the maneuvering mode of the VVER-1000 reactor

Anisur

Uvakin

2020

J. Phys.: Conf. Ser.

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The aim of this thesis paper is to analysis the power peaking factors Kr of the VVER-1000 reactor. Power peaking factor is important for the safety operation of the VVER-1000 power reactor. The maintenance of the core power distribution in a nuclear power plant is a precondition for the safety operation of a reactor. In this investigation used boron carbide. Boron carbide is a compound that contains boron and carbon, especially B4C; an extremely hard, non-metallic, black crystalline compound or solid solution. Only diamond is harder. In addition to its hardness property, boron carbide has the physical properties of corrosion resistance, heat strength, low specific gravity and high elastic modulus. It is used as an abrasive, neutron absorber for nuclear reactors, and as an alloying agent in composite structural materials. For this reason, when need to change the power of a reactor then the boron carbide (B4C) control insert the reactor core. In this step investigated the power picking factors and its deviation using the Boron carbide (B4C). Power peaking factors are connecting between the thermal-hydraulics and the nutronics of the nuclear power plant core. This power peaking factors was calculated by the comprehensive nutronics calculation program GETERA-93.

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Effect of the Burnable Absorber (Gd) on the Multiplying Coefficient (K<sub>∞</sub>) in the Process of Fuel Burnup for Full-Scale and Poly Cells Models for the WWER Reactor

Uvakin

2022

GNS

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The paper considers various concentrations of burnable absorber (BA) Gadolinium (Gd) in the system of compensation of excess reactivity in the reactor of WWER type at the extended campaigns. It is analyzed the influence of the method for the Full-scale and Poly-cells model placing the burnable absorber in the fuel with gadolinium rods (tveg). The strong influence of the BAs composition in the fuel with gadolinium rods (tveg) dependence on the multiplication factor of the fuel burnup is shown.

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Investigation of Absorber Concentration Changes During Maneuvering Operation in VVER 1000 Reactor

Cited by 4 publications

References 6 publications

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Investigation of the power peaking factor K_rin the fuel assembly during the maneuvering mode of the VVER-1000 reactor

Effect of the Burnable Absorber (Gd) on the Multiplying Coefficient (K<sub>∞</sub>) in the Process of Fuel Burnup for Full-Scale and Poly Cells Models for the WWER Reactor

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Investigation of Absorber Concentration Changes During Maneuvering Operation in VVER 1000 Reactor

Cited by 4 publications

References 6 publications

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Burnable absorber element (Gd and Er) use in the WWER-type reactor to increase the refueling time

Investigation of the power peaking factor Krin the fuel assembly during the maneuvering mode of the VVER-1000 reactor

Effect of the Burnable Absorber (Gd) on the Multiplying Coefficient (K<sub>∞</sub>) in the Process of Fuel Burnup for Full-Scale and Poly Cells Models for the WWER Reactor

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Investigation of the power peaking factor K_rin the fuel assembly during the maneuvering mode of the VVER-1000 reactor