Authors & Affiliations
Adeev V.A.1, Kavun V.O.2, Kavun O.Yu.2
1. Kola NPP, Polyarnye Zori, Russia
2. Scientific and Engineering Centre for Nuclear and Radiation Safety, Moscow, Russia
Adeev V.A. – Head of Laboratory, Cand. Sci. (Tech.), Kola NPP.
Kavun V.O. – Junior Researcher, Scientific and Engineering Centre for Nuclear and Radiation Safety.
The Kola NPP continues operating 2nd & 3rd generation fuel featuring higher enrichment of up to 4.87% (FA-2 and FA-3) and an advanced design providing the most optimal performance character-istics. These fuel assemblies are expected to be used in a higher energy density fuel cycle for post-power uprate operation. A fuel loading pattern for operation at an uprated power level involves stricter requirements for power peaking. In addition, a number of bounding core physics parameters must be met.
The present paper provides insights from VVER-440 operation with 2nd and 3rd generation fuels and a brief analysis of power distribution in the reactor core. A comparison of computational and experimental data demonstrated that the difference between the experimental and computational assembly power peaking factors are up to 3% on average. The greatest deviation exceeds a 5%-uncertainty of measurements and calculations for fresh Gd FAs.
Design features of Gd fuel assemblies and their multiplication behaviour were considered contingent on the arrangement of Gd fuel pins in a FA and Gd-containing FAs in the core, as well as adjacent FAs. Ways to produce microconstants are given for coarse mesh diffusion codes, which help address actual operating conditions of fresh FAs.
A description is given of core design techniques that ensure a requisite accuracy to predict power distribution in burnable poison FAs.
core design optimization, fuel load, calculation accuracy, power distribution, burnable poison, microconstants, uprated power operation
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