Detection of leakage of fuel elements by xenon isotope ratios in primary water of Paks NPP

L. Palcsu, Zs Szántó, É Svingor, M. Molnár, I. Futé, Z. Major, T. Pintér

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

By measuring the xenon isotope ratios in the primary circuit it is possible to detect the presence of inhermetic fuel rods in the reactor. Because high amounts of Xe and Kr isotopes are produced during the fission of uranium the existence of leakages can be detected by measuring these dissolved isotopes. During the operation beside the fission of 235U, plutonium-239 is also generated by fast neutron capture of 238U. Due to the 239Pu splitting the isotope ratios of fission produced xenon and krypton are changed. Supposing that during the fission period the isotope ratios follow a linear trend, and measuring two isotope ratios it is possible to determine the time that fuel elements spent in the reactor. We have been continuously sampling the dissolved gas in the primary water of the four circuits in the Paks NPP since 1999. The examination of the circuit-3 in the four blocks requires a special interest, because we have found an anomaly in the xenon isotope ratios. On the basis of the measurement data and the theoretical calculations it seems that the damaged fuel element was installed into the reactor in 1999, and it was removed from the reactor during the refuelling procedure in Summer 2002.

Original languageEnglish
Pages353-359
Number of pages7
Publication statusPublished - Dec 1 2002
EventInternational Conference - Nuclear Energy for New Europe 2002, Proceedings - Kranjska Gora, Slovenia
Duration: Sep 9 2002Sep 12 2002

Other

OtherInternational Conference - Nuclear Energy for New Europe 2002, Proceedings
CountrySlovenia
CityKranjska Gora
Period9/9/029/12/02

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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    Palcsu, L., Szántó, Z., Svingor, É., Molnár, M., Futé, I., Major, Z., & Pintér, T. (2002). Detection of leakage of fuel elements by xenon isotope ratios in primary water of Paks NPP. 353-359. Paper presented at International Conference - Nuclear Energy for New Europe 2002, Proceedings, Kranjska Gora, Slovenia.