Applications of the total absorption technique to improve reactor decay heat calculations: study of the beta decay of 102,104,105Tc

A. Algora, D. Jordan, J. L. Taín, B. Rubio, J. Agramunt, A. B. Perez-Cerdan, F. Molina, L. Caballero, E. Nácher, A. Krasznahorkay, M. D. Hunyadi, J. Gulyás, A. Vitéz, M. Csatlós, L. Csige, J. Äystö, H. Penttilä, I. D. Moore, T. Eronen, A. JokinenA. Nieminen, J. Hakala, P. Karvonen, A. Kankainen, A. Saastamoinen, J. Rissanen, T. Kessler, C. Weber, J. Ronkainen, S. Rahaman, V. Elomaa, U. Hager, S. Rinta-Antila, T. Sonoda, K. Burkard, W. Hüller, L. Batist, W. Gelletly, T. Yoshida, A. L. Nichols, A. Sonzogni, K. Peräjärvi

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

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. [1], who demonstrated that an incomplete knowledge of the β-decay of some Tc isotopes could be the source of the systematic discrepancy. Motivated by [1], 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.

Original languageEnglish
Pages (from-to)207-214
Number of pages8
JournalAIP Conference Proceedings
Volume1090
DOIs
Publication statusPublished - 2009
Event13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Cologne, Germany
Duration: Aug 25 2009Aug 29 2009

Keywords

  • Beta decay
  • Penning trap
  • Reactor heat summation calculations
  • Total absorption

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Algora, A., Jordan, D., Taín, J. L., Rubio, B., Agramunt, J., Perez-Cerdan, A. B., Molina, F., Caballero, L., Nácher, E., Krasznahorkay, A., Hunyadi, M. D., Gulyás, J., Vitéz, A., Csatlós, M., Csige, L., Äystö, J., Penttilä, H., Moore, I. D., Eronen, T., ... Peräjärvi, K. (2009). Applications of the total absorption technique to improve reactor decay heat calculations: study of the beta decay of 102,104,105Tc. AIP Conference Proceedings, 1090, 207-214. https://doi.org/10.1063/1.3087014