cea-02438724
https://cea.hal.science/cea-02438724
https://cea.hal.science/cea-02438724/document
https://cea.hal.science/cea-02438724/file/201600002883.pdf
[CEA] CEA - Commissariat à l'énergie atomique
[DEN] Direction des énergies
Validation of the Apollo2.8 code package for the calculation of $\beta_{EFF}$ and $\Lambda$ kinetics parameters and the reactivity versus reactor period relationship
Leconte, P.
Truchet, G.
Vidal, J.-F.
Santamarina, A.
Blaise, P.
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]
COMM
This paper presents the analysis of kinetics parameters experiments performed in the IPEN/MB-01 mock-upwith the deterministic APOLLO2 code. Comparisons of measurements and calculations are presented on theeffective delayed neutron fraction $\beta_{EFF}$ , prompt neutron generation $\Lambda$ and on the relationship between the reactivity and the period. The impact of the calculation scheme and of the input nuclear data library is testedand discussed. Comparisons with TRIPOLI4 continuous energy Monte-Carlo calculations have been done fornumerical validation purpose.The study shows the significant impact of uncertainties associated with delayed neutron abundances anddecay constants on the reactivity prediction, ranging from 4 to 6% in the [0 – 0.5] range. One of the mainresults is also the overprediction of $\beta_{EFF}$ by 3 $\pm$ 0.7%, using the JEFF-3.1.1 data, consistent with the overprediction of the reactivity of 4-6% over the whole positive period range. The ENDF/B-VII.0, in spite of a betterestimate of $\beta_{EFF}$, leads to an underestimation of the reactivity reaching up to 13%.
2016-05-01
2020-01-14
en
PHYSOR 2016
Sun Valley, United States