Apollo2 Year 2010

Sanchez, Richard; Zmijarevi, Igor; Coste–Delclaux, Mireille; Masiello, Emiliano; Santandrea, Simone; Martinolli, E.; Villate, Laurence; Schwartz, Nadine; Guler, Nathalie

doi:10.5516/net.2010.42.5.474

Cited by 157 publications

(64 citation statements)

References 26 publications

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“…Since these measurement techniques are independent of the core composition, this uncertainty was treated for a single core as fully correlated at all fission fraction values. Fission fraction uncertainties of δf i =f i ¼ 5% were determined by comparing measurements of isotopic content in spent nuclear fuel to values obtained by the APOLLO2 reactor modeling code [2,22]. As these comparisons do not suggest systematic biases in the reported fission fractions for specific burnup ranges, fission fraction uncertainties were treated as fully correlated for all F 239 .…”

mentioning

confidence: 99%

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2017

Phys. Rev. Lett.

176

225

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The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of six 2.9 GW$_{\textrm{th}}$ reactor cores at the Daya Bay and Ling Ao nuclear power plants. Using detector data spanning effective $^{239}$Pu fission fractions, $F_{239}$, from 0.25 to 0.35, Daya Bay measures an average IBD yield, $\bar{\sigma}_f$, of $(5.90 \pm 0.13) \times 10^{-43}$ cm$^2$/fission and a fuel-dependent variation in the IBD yield, $d\sigma_f/dF_{239}$, of $(-1.86 \pm 0.18) \times 10^{-43}$ cm$^2$/fission. This observation rejects the hypothesis of a constant antineutrino flux as a function of the $^{239}$Pu fission fraction at 10 standard deviations. The variation in IBD yield was found to be energy-dependent, rejecting the hypothesis of a constant antineutrino energy spectrum at 5.1 standard deviations. While measurements of the evolution in the IBD spectrum show general agreement with predictions from recent reactor models, the measured evolution in total IBD yield disagrees with recent predictions at 3.1$\sigma$. This discrepancy indicates that an overall deficit in measured flux with respect to predictions does not result from equal fractional deficits from the primary fission isotopes $^{235}$U, $^{239}$Pu, $^{238}$U, and $^{241}$Pu. Based on measured IBD yield variations, yields of $(6.17 \pm 0.17)$ and $(4.27 \pm 0.26) \times 10^{-43}$ cm$^2$/fission have been determined for the two dominant fission parent isotopes $^{235}$U and $^{239}$Pu. A 7.8% discrepancy between the observed and predicted $^{235}$U yield suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.Comment: 7 pages, 5 figure

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mentioning

confidence: 99%

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2017

Phys. Rev. Lett.

176

225

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“…Работата е извършена в рамките на два проекта на ЕС -NURESIM (Nuclear Reactor Simulation Platform) [2] и NURISP (Nuclear Reactor Integrated Simulation Project) [3]. Изследвани са изчислителни схеми за практическо генериране на библиотеки сечения за хомогенизирани касети и горивни клетки на ВВЕР с метода на характеристиките (MOC) в транспортната програма APOLLO2 [4,5]. Тези схеми са числено валидирани в серия тестови задачи с детерминистични и Монте-Карло референтни решения.…”

Section: въведениеunclassified

“…Тя е транспортна програма за най-добра оценка с основно приложение -създаване на библиотеки сечения, референтни транспортни пресмятания, за изследователски и дизайнерски разработки и анализи в 2D и др. [4,5] APOLLO2 (А2) е обектно ориентирана програма написана на езика FORTRAN.…”

Section: Apollo28-3еunclassified

Изследване На Изчислителни Схеми С Повишена Разделителна Способност За Неутронно-Физични Пресмятания На ВВЕР

Petrov¹

2013

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“…All simulations were performed by means of the deterministic transport code APOLLO2 version 2.8-3.E [10]. APOLLO2 is a modular cell code for 2-dimensional multigroup transport calculations.…”

Section: Description Of Neutronic Codementioning

confidence: 99%

Neutronics characterization of an erbia fully poisoned PWR assembly by means of the APOLLO2 code

Pergreffi

Mattioli

Rocchi

2017

EPJ Nuclear Sci. Technol.

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Abstract. Recently, increasing demands on the reduction of fuel cycle costs have led to higher burnup fuel designs. According to the erbia-credit super high burnup fuel concept, developed by mixing low content of erbia to UO 2 powder directly after reconversion process so that all fuel pins in a given fuel assembly are homogeneously doped, the present study aims to characterize, from a neutronic point of view, a 17 Â 17 pressurized water reactor assembly enriched to 10.27 wt.% in 235 U with an erbia content of 1 at.% (i.e. 0.7 wt.%) by means of the deterministic neutronic code APOLLO2. For this purpose, a simplified thermal-hydraulic analysis was performed in order to evaluate the effects on fuel thermal conductivity of adding erbia to uranium oxide. The results obtained allow to conclude that an Er-doped assembly enriched to >5 wt.% in 235 U represents an advantageous solution for very long fuel cycles, and it is so suited for very high burnups.

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Apollo2 Year 2010

Cited by 157 publications

References 26 publications

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

Изследване На Изчислителни Схеми С Повишена Разделителна Способност За Неутронно-Физични Пресмятания На ВВЕР

Neutronics characterization of an erbia fully poisoned PWR assembly by means of the APOLLO2 code

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