The decay heat of the fission products plays an important role in predicting the heat-up of nuclear fuel after reactor shutdown. This form of energy release is calculated as the sum of the energy-weighted activities of all fission products P(t) = Σ.EiλiN i(t), where Ei; is the decay energy of nuclide i (gamma and beta component), λ,- is the decay constant of nuclide i and N i(t) is the number of nuclide i at cooling time t. Even though the reproduction of the measured decay heat has improved in recent years, there is still a long standing discrepancy at t - 1000s cooling time for some fuels. A possible explanation for this disagreement can been found in the work of Yoshida et al. , who demonstrated that an incomplete knowledge of the β-decay of some Tc isotopes could be the source of the systematic discrepancy. Motivated by , we have recently measured the β -decay process of some Tc isotopes using a total absorption spectrometer at the IGISOL facility in Jyväskylä. The results of the measurements are discussed, along with their impact on summation calculations. © 2009 American Institute of Physics.
|Conferencia||AIP Conference Proceedings|
|Período||25/05/16 → …|
- Física y astronomía (todo)