Calculation of fission product (FP) release from solid fuel in the Phebus FPT0 and FPT1 experiments with the MFPR version 1.1 code is presented. In the context of the mechanistic modelling of MFPR, the degree of fuel irradiation is an important parameter affecting FP behaviour. For trace irradiated fuel (FPT0), the FP atoms within the grains lead to very little bubble formation and they leave the grains mainly in atomic form creating intergranular bubbles. The formation of interconnected paths between these bubbles remains slight until high temperatures are reached thus delaying significant FP release. With irradiated fuel (FPT1), on the other hand, volatile fission products accumulate mainly in intragranular microbubbles before leaving the grains and the interlinking of intergranular bubbles is faster.

Calculation of Fission Product Release from Solid Fuel in PTHEBUS FPT0 and FPT1 Experiments with the Code MFPR v1.1

Davidovich, N.
1999-12-01

Abstract

Calculation of fission product (FP) release from solid fuel in the Phebus FPT0 and FPT1 experiments with the MFPR version 1.1 code is presented. In the context of the mechanistic modelling of MFPR, the degree of fuel irradiation is an important parameter affecting FP behaviour. For trace irradiated fuel (FPT0), the FP atoms within the grains lead to very little bubble formation and they leave the grains mainly in atomic form creating intergranular bubbles. The formation of interconnected paths between these bubbles remains slight until high temperatures are reached thus delaying significant FP release. With irradiated fuel (FPT1), on the other hand, volatile fission products accumulate mainly in intragranular microbubbles before leaving the grains and the interlinking of intergranular bubbles is faster.
Analisi sistemi e di sicurezza
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/6429
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