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2 Journal of Power Technologies

2 2011

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Model analysis of isotopic composition of VVER-440 spent nuclear fuel

100%

Čudrnák P. , Nečas V.

tom Vol. 91, nr 3

136-139

This paper presents an analysis of the isotopic composition of spent nuclear fuel under different operating conditions. Calculations were made for fuel assemblies of a VVER-440 reactor with second-generation Gd-2 fuel with enrichment of 4.25% 235U. The isotopic concentration was analyzed as a function of burnup of nineteen isotopes, selected on the basis of environmental risk, such as main fuel isotopes 235U, 236U, 238U, 239Pu, 240Pu, 241Pu, as well as some actinides, and fission products, such as 237Np, 238Pu, 242Pu, 241Am, 242Am, 242Cm, 244Cm, 245Cm, 90S r, 93Zr, 99Tc, 129I, 137Cs. The SCALE 6 computer code was used for model design and computer analysis.

Optimization of fuel assembly with gadolinium for LWRS

67%

Cudrnak P. , Necas V.

tom Vol. 91, nr 4

186-190

At present, the fuel assemblies of Light Water Reactors require mainly cost-effective production of electricity. The objective of in-core fuel management is to achieve the objective of minimizing fuel cycle cost by using advanced models of core loading strategies. Current development is focused mainly on optimizing the design of gadolinium fuel, thereby to reduce the average enrichment of fuel assemblies and the binding of the excess reactivity at the beginning of the fuel cycle. This paper deals with different ways of optimizing fuel assemblies containing a burnable absorber for PWR and VVER reactors. These calculations were made in SCLAE 6 code, TRION module.