The Inversion Point of the Isothermal Reactivity Coefficient of the IPEN/MB-01 Reactor—II: Theoretical Analysis

Santos, Adimir dos; Silva, G. S. de Andrade e; Mendonça, A.G.; Fuga, R.; Abe, Alfredo

doi:10.13182/nse05-a2543

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…At this point, the cross section library is problem dependent. A fine multigroup structure of 620 groups (SAND-II structure) was considered to generate the broad group library, which in turn was collapsed to 16 broad groups with five upscattering as in (Dos Santos et al, 2005). The order of scattering (Legendre order expansion) was P 3 throughout the analyses.…”

Section: Control Bank Position (%)mentioning

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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Section: Control Bank Position (%)mentioning

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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“…Uma estrutura de grupo fino com 620 grupos é considerada para gerar a biblioteca de grupo amplo, que por sua vez, é colapsada para 16 grupos amplos com 5 upscattering (Dos Santos, 2005).…”

Section: Mé Todo De Ordenadas Discretasunclassified

“…3.7, na face leste do núcleo do reator, de 71.43% até 1.83%. Em todos os cá lculos a mesma fonte de Am-tri-dimensional em X-Y-Z, a aproximaç ã o P 3 , a quadratura angular S 16 , e 16 grupos com 5 upscatterings té rmicos(Dos Santos, 2005). A distribuiç ã o de mesh consite em: 52 intervalos na direç ã o X, 50 na direç ã o Y, e 81 na…”

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Obtenção de reatividade subcrítica por meio de medidas de APSD e CPSD utilizando detectores modo pulso no reator IPEN/MB-01

Lee¹

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This work presents a new experimental approach to determine the reactivity levels of subcritical systems. The method employs the subcritical kinetic model developed by Gandini and Salvatores and it is based only on measured quantities such as counting rates of the detectors employed in the experiments and the parameters arising from the least squares fitting of the APSD (Auto Power Spectral Density) and CPSD (Cross Power Spectral Density). Detector efficiencies, quantity required in other procedures such as Neutron Source Multiplication (NSM) method, are not needed in the proposed method. The only hypothesis made in the method was the independence of the effective delayed neutron fraction and the prompt neutron generation time to the subcriticality level of the system. The proposed method was applied to measure the reactivity of several subcritical configurations of the IPEN/MB-01 reactor. Measurements of APSD and CPSD were performed in several degrees of subcriticality (up to around-7000 pcm). The spectral densities data were least squares fitted to get the prompt decay mode (α) and other quantities. Beside the startup source of the facility, an external neutron source of Am-Be was installed near the core in order to improve neutron counting statistics. The final experimental results are of good quality. The proposed experimental method shows clearly that the classical point kinetic theory cannot describe the measured reactivity. Instead, the reactivity inferred from this model follows closely the subcriticality index () for the source arrangements in the experiment. The agreement of the MCNP5 and GPT-TORT results, both with ENDF/B-VII.0 as the basic nuclear data library, when compared to the corresponding experimental ones was also good. vi SUMÁRIO BC1 e BC2 65.5% retirados-2 fontes de AmBe c

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New experimental results for the inversion point of the isothermal reactivity coefficient of the IPEN/MB-01 reactor

Santos

Silva

Mendonça³

et al. 2009

Annals of Nuclear Energy

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The Inversion Point of the Isothermal Reactivity Coefficient of the IPEN/MB-01 Reactor—II: Theoretical Analysis

Cited by 10 publications

References 7 publications

A new experimental approach for subcritical reactivity determination of multiplying systems

A new experimental approach for subcritical reactivity determination of multiplying systems

Obtenção de reatividade subcrítica por meio de medidas de APSD e CPSD utilizando detectores modo pulso no reator IPEN/MB-01

New experimental results for the inversion point of the isothermal reactivity coefficient of the IPEN/MB-01 reactor

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