Development of fuel cycles with new fuel with 8.9 mm external diameter for VVER-440: Preliminary assessment of operating efficiency

Gagarinskiy, A. A.

doi:10.3139/124.110812

Kerntechnik

2017

DOI: 10.3139/124.110812

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Development of fuel cycles with new fuel with 8.9 mm external diameter for VVER-440: Preliminary assessment of operating efficiency

A. A. Gagarinskiy

Abstract: Since the introduction of VVERs-440, their fuel assemblies are subject to ongoing improvements. Until now, the basic structural parameters of fuel, such as rod diameter of 9.1 mm, have never changed. This paper focuses on computational estimates of basic neutronic parameters of the fuel cycle that involves assemblies consisting of fuel rods with diameter reduced to 8.9 mm.

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Advantages of VVER-440 fuel cycles with new fuel assemblies

2018

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Throughout the existence of VVER-440 reactors, their fuel design was always subject to ongoing improvements. By the moment, extensive computations and RD&D have been performed to evaluate the feasibility of further improvement of VVER-440 fuel cycles and fuel design. This paper discusses computational assessments of basic neutronic parameters of prospective fuel cycles based on newly-designed fuel assemblies, namely RK3+, slim rod and RK3+SR. RK3+ stands for shroud less fuel assemblies with wide angle bars instead of shrouds and optimized pitches between fuel rods. Slim Rod means shrouded fuel assemblies with rods whose external diameter was reduced to 8.9 mm. RK3+SR is an abbreviation for shroud less fuel assemblies with wide angle bars instead of shrouds and rods whose external diameter was reduced to 8.9 mm. This paper demonstrates that, in the countries operating VVERs-440, a transition to new fuel design would improve both the energy output and the fuel cycle economy.

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Advantages of VVER-440 fuel cycles with new fuel assemblies

2018

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A neutronics feasibility study on utilization of a thinned cladding fuel design at Loviisa NPP

et al. 2018

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Recently, an initiative has been made to improve the fuel economy of VVER-440 reactors by implementing a modification on the geometry of the current fuel assembly design. The proposed modification involves reduction of the fuel rod outer diameter from 0.91 cm to 0.89 cm by using 0.01 cm thinner cladding tubes than earlier. The design improvement would shift the neutronics of an under-moderated system slightly towards optimum moderation and, therefore, increase the reactivity of the assembly. In this paper, a neutronics feasibility study on utilization of the proposed new fuel design at Loviisa NPP is carried out. The study involves a comprehensive comparison of two individual equilibrium fuel cycles: one applying current TVEL 2nd generation fuel design and another one where the new fuel design is used. In addition to equilibrium cycle characteristics, also cycle economics as well as back-end effects are considered. The study concludes that the proposed fuel design modification enables to improve the fuel economy of Loviisa NPP.

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Development of fuel cycles with new fuel with 8.9 mm external diameter for VVER-440: Preliminary assessment of operating efficiency

Cited by 2 publications

References 0 publications

Advantages of VVER-440 fuel cycles with new fuel assemblies

Advantages of VVER-440 fuel cycles with new fuel assemblies

A neutronics feasibility study on utilization of a thinned cladding fuel design at Loviisa NPP

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