The Reactivity Temperature Coefficient Analysis in Light Water Moderated UO2and UO2-PuO2Lattices

Erradi, L.; Santamarina, A.; Litaize, O.

doi:10.13182/nse144-47

Cited by 17 publications

(14 citation statements)

References 10 publications

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“…Experimental validation of the APOLLO2 [10] deterministic code, using both JEF-2.2 and JEFF-3.1 based libraries, demonstrates [7,11]:…”

Section: Measurements Of Thementioning

confidence: 99%

“…The analysis of physical phenomena [11] has shown that the negative error in the low-temperature range is linked to the thermal spectrum shift effect, which is strongly dependant on the sub-thermal and thermal shapes of the plutonium cross sections. The 239 Pu α = σ γ /σ f proposed modification in the thermal range is shown in figure 2.…”

Section: Measurements Of Thementioning

confidence: 99%

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²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Bernard

Fort

Courcelle

et al. 2007

Nd2007

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Abstract. The analysis of k eff multiplicative factor of 100%-MOx cores and plutonium solutions showed a systematic discrepancy between calculation and experiment. The aim of this paper is to propose an improved version of the JEFF-3.1 239 Pu evaluation in the low-energy neutron range. We propose here slight modifications of the evaluation file, consistent with the uncertainties of differential data measurements in sub-thermal/thermal and epithermal ranges, namely: modifications of the sub-thermal fission, capture and total cross sections, and a revised evaluation of ν p from sub-thermal up to 20 eV using a phenomenological formalism. The proposed modifications are described and tested against integral measurements.

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“…Experimental validation of the APOLLO2 [10] deterministic code, using both JEF-2.2 and JEFF-3.1 based libraries, demonstrates [7,11]:…”

Section: Measurements Of Thementioning

confidence: 99%

Section: Measurements Of Thementioning

confidence: 99%

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Bernard

Fort

Courcelle

et al. 2007

Nd2007

Self Cite

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“…Results are summarized in Table 1. According to conclusions reported in reference [16], Da iso is mainly sensitive to the spectral shift of thermal neutrons in the low temperature range (T < 40°C). The contribution of the water density effects becomes sizeable when the temperature increases.…”

Section: Introductionmentioning

confidence: 77%

“…The quoted uncertainties account for the statistical uncertainties in order to quantify the contribution of the Monte-Carlo calculations only. The propagation of the experimental uncertainties was already addressed in the frame of the previous analysis performed with the deterministic code APOLLO2 [16,17]. …”

Section: Reactivity Excess As a Function Of Temperaturementioning

confidence: 99%

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Impact of the thermal scattering law of H in H₂O on the isothermal temperature reactivity coefficients for UOX and MOX fuel lattices in cold operating conditions

Scotta

Noguère

Bernard

et al. 2016

EPJ Nuclear Sci. Technol.

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Abstract. The contribution of the thermal scattering law of hydrogen in light water to isothermal temperature reactivity coefficients for UOX and MOX lattices was studied in the frame of the MISTRAL critical experiments carried out in the zero power reactor EOLE of CEA Cadarache (France). The interpretation of the core residual reactivity measured between 6°C to 80°C (by step of 5°C) was performed with the Monte-Carlo code TRIPOLI4 ® . The nuclear data from the JEFF-3.1.1 library were used in the calculations. Three different thermal scattering laws of hydrogen in light water were tested in order to evaluate their impact on the MISTRAL calculations. The thermal scattering laws of interest were firstly those recommended in JEFF-3.1.1 and ENDF/B-VII.1 and also that recently produced at the atomic center of Bariloche (CAB, Argentina) with molecular dynamic simulations. The present work indicates that the calculation-to-experimental bias is À0.4 ± 0.3 pcm/°C in the UOX core and À1.0 ± 0.3 pcm/°C in the MOX cores, when the JEFF-3.1.1 library is used. An improvement is observed over the whole temperature range with the CAB model. The calculation-to-experimental bias vanishes for the UOX core (À0.02 pcm/°C) and becomes close to À0.7 pcm/°C for the MOX cores. The magnitude of these bias have to be connected to the typical value of the temperature reactivity coefficient that ranges from À5 pcm/°C at Begining Of Cycle (BOC) up to À50 pcm/°C at End Of Cycle (EOC), in PWR conditions.

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Reactor Physics Experiments on Zero Power Reactors

Bignan

Fougeras

Blaise

et al. 2010

Handbook of Nuclear Engineering

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The Reactivity Temperature Coefficient Analysis in Light Water Moderated UO₂and UO₂-PuO₂Lattices

Cited by 17 publications

References 10 publications

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Impact of the thermal scattering law of H in H₂O on the isothermal temperature reactivity coefficients for UOX and MOX fuel lattices in cold operating conditions

Reactor Physics Experiments on Zero Power Reactors

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The Reactivity Temperature Coefficient Analysis in Light Water Moderated UO2and UO2-PuO2Lattices

Cited by 17 publications

References 10 publications

239Pu nuclear data improvements in thermal and epithermal neutron ranges

239Pu nuclear data improvements in thermal and epithermal neutron ranges

Impact of the thermal scattering law of H in H2O on the isothermal temperature reactivity coefficients for UOX and MOX fuel lattices in cold operating conditions

Reactor Physics Experiments on Zero Power Reactors

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The Reactivity Temperature Coefficient Analysis in Light Water Moderated UO₂and UO₂-PuO₂Lattices

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges

Impact of the thermal scattering law of H in H₂O on the isothermal temperature reactivity coefficients for UOX and MOX fuel lattices in cold operating conditions