A Set of Critical Loading Configurations of the IPEN/MB-01 Reactor

Santos, Adimir dos; Fanaro, Leda C. C. B.; Siqueira, Paulo T.D.; Jerez, Rogério; Abe, Alfredo; Fuga, R.

doi:10.1063/1.1945271

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…The thermocouples are made of an alloy of Cu-Ni (55% Cu and 45% Ni) and their diameter is 1.6 mm. As in LEU.COMP.THERM.077 (Dos Santos et al, 2004), 12 thermocouples were used in the experiment. The thermocouples were calibrated by a standard procedure and the claimed accuracy for the absolute measurements is ±0.02°C.…”

Section: Experimental Configuration and Proceduresmentioning

confidence: 99%

“…In this aspect the IPEN/MB-01 reactor can be of extreme importance because it is an installation with very well established geometric features and material content. The IPEN/ MB-01 reactor has been considered an international benchmark in various experiments of critical configurations (Dos Santos et al, 2004;Dos Santos et al, 2008) as well as in several reactor physics experiments (Dos Santos et al, 2009). Thus, the IPEN/MB-01 reactor can be considered extremely important for developing experimental methods and establishing experimental parameters for the validation of kinetic models for subcritical systems.…”

Section: Introductionmentioning

confidence: 99%

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A new experimental approach for subcritical reactivity determination of multiplying systems

Santos

Lee

Diniz

et al. 2013

Annals of Nuclear Energy

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Section: Experimental Configuration and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new experimental approach for subcritical reactivity determination of multiplying systems

Santos

Lee

Diniz

et al. 2013

Annals of Nuclear Energy

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“…Thus, the IPEN/MB-01 may be considered of utmost importance to establish experimental parameters to validate kinetic models of subcritical systems [19][20][21][22].…”

Section: B the Obtainment Of The Subcriticality Index ζmentioning

confidence: 99%

A proposal for a subcritical reactivity meter based on Gandini and Salvatores' point kinetics equations for multiplying subcritical systems

Pinto

Gonnelli

Santos

2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

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Multiplying Subcritical Systems were for a long time poorly studied and its theoretical description remains with plenty open questions. Great interest on such systems arose partly due to the improvement of hybrid concepts, such as the AcceleratorDriven Systems (ADS). Along with the need for new technologies to be developed, further study and understanding of subcritical systems are essential also in more practical situations, such as in the case of a PWR criticalization in their physical startup tests. Point kinetics equations are fundamental to continuously monitor the reactivity behavior to a possible variation of external sources intensity. In this case, quickly and accurately predicting power transients and reactivity becomes crucial. It is known that conventional Reactivity Meters cannot operate in subcritical levels nor describe the dynamics of multiplying systems in these conditions, by the very structure of the classical kinetic equations. Several theoretical models have been proposed to characterize the kinetics of such systems with special regard to the reactivity, as the one developed by Gandini and Salvatores among others. This work presents a discussion about the derivation of point kinetics equations for subcritical systems and the importance of considering the external source. From the point of view of the Gandini and Salvatores' point kinetics model and based on the experimental results provided by Lee and dos Santos, it was possible to develop an innovative approach. This article proposes an algorithm that describes the subcritical reactivity with external source, contributing to the advancement of studies in the field.

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“…The experiments carried out at the IPEN/MB-01 nuclear reactor facility use several types of thermal neutron detectors -boron lined, boron trifluoride (BF 3 ) and helium-3 ( 3 He) proportional detectorsfor the traditional nuclear reactor physics experiments, including important benchmark works for ICSBEP (International Criticality Safety Benchmark Evaluation Project) [19]- [23] and IRPhEP (International Reactor Physics Evaluation Project) [24] which validate essential parameters.…”

Section: Introductionmentioning

confidence: 99%

A Simple Way to Overcome the Shortage of <inline-formula> <tex-math notation="LaTeX">$^{3}\rm {He}$ </tex-math> </inline-formula> Detectors in the IPEN/MB-01 Nuclear Reactor

Gonnelli

Pinto

Landim

et al. 2016

IEEE Trans. Nucl. Sci.

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Abstract-In order to overcome the shortage of 3 He detectors for subcritical experiments in the IPEN/MB-01 reactor, some experiments were performed employing less sensitive detectors, such as BF 3 , and a logic input module, which sums the counts from different detectors. Through microscopic and macroscopic neutron noise technique, it was possible to obtain, respectively, Rossi-α distribution and Auto Power Spectral Densities (APSD) for each detector configuration and various subcritical levels, and the prompt neutron decay constant (α) was extracted through a least squares procedure. In addition, Cross Power Spectral Densities (CPSD) were acquired for different types of detectors and the correlation among those detectors was confirmed. It was also observed that there was no loss of correlation among the neutron pulses, and therefore, the CPSD curves demonstrated the presence of correlated events. The  parameter was used as an indicator for the comparison of the results and for the quality of the experimental data. The obtained values demonstrate that the sum of counts technique does not present loss of information (correlated neutrons) even for different models and types of detectors, suggesting that the technique may be employed in neutron noise measurements for subcritical reactivity.

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A Set of Critical Loading Configurations of the IPEN/MB-01 Reactor

Cited by 8 publications

References 1 publication

A new experimental approach for subcritical reactivity determination of multiplying systems

A new experimental approach for subcritical reactivity determination of multiplying systems

A proposal for a subcritical reactivity meter based on Gandini and Salvatores' point kinetics equations for multiplying subcritical systems

A Simple Way to Overcome the Shortage of <inline-formula> <tex-math notation="LaTeX">$^{3}\rm {He}$ </tex-math> </inline-formula> Detectors in the IPEN/MB-01 Nuclear Reactor

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