Delvonei De Andrade - Academia.edu (original) (raw)

Papers by Delvonei De Andrade

Research paper thumbnail of Fake news oficial: um exemplo do uso da notícia em falso contexto na sociedade em rede

Cuadernos de educación y desarrollo, Jul 31, 2023

RESUMO O objetivo deste artigo é analisar a divulgação do índice do PIB brasileiro, divulgado em ... more RESUMO O objetivo deste artigo é analisar a divulgação do índice do PIB brasileiro, divulgado em 2022, como exemplo do que pode se chamar "fake news oficial", onde a confiabilidade do emissor se sobrepõe ao caráter factível e plausível da informação, necessárias ao fato real. Para isso se baseia nas teorias de Castell, das relações de poder nos processos de comunicação socializada e da desordem da informação. Palavras-chave: comunicação, gestão da informação, sociedade em rede, fake news, informação.

Research paper thumbnail of Thermal Hydraulic Phenomenology for the Heating Process in a Natural Circulation Facility

This work describes thermal hydraulic phenomenology observed for the heating process in a natural... more This work describes thermal hydraulic phenomenology observed for the heating process in a natural circulation facility. Glass made circuit allows observations of the thermal hydraulic processes over several regions. Natural convection, natural circulation, nucleated sub-cooled, saturated boiling and some flow patterns such as, bubbly, slug and churn flow are observed and described. Facility heated and cooled parts are responsible for the natural circulation when in operation. An expansion tank accommodates the fluid density variations due to the temperature changes and void fraction. Instrumentation consists of thermocouples distributed along the circuit. Two differential pressure transducers are used for pressure and level measurements. Instrumentation signals and images are simultaneously acquired to help with phenomenon description. A CCD digital camera at a 250µs shutter speed is used for the images acquisition. Phenomenology described is based on a test under 1.1 x 10 5 W/m 2 of heat flux which corresponds to an electrical heater power of 7000 W and 0.0236 kg/s (85 l/h) of cooling flow rate.

Research paper thumbnail of Thermal hydrodynamical analysis of a countercurrent gas centrifuge

Annals of Nuclear Energy, Jul 1, 1998

The separative effect in a centrifuge is amplified when a countercurrent in the axial direction i... more The separative effect in a centrifuge is amplified when a countercurrent in the axial direction is added to the centrifugal field. The mchanisms used to create this countercurrent are obtained with the gas deceleration near to the waste scoop, mechanical effect, and temperature distribution on the rotor walls, thermal effect. This work treats the influence of the thermal countercurrent on the centrifuge separative performance. A complete centrifuge model is presented, therefore this study passes by the hydrodynamical and thermal phenomena analysis. For the accomplishment of this work the gas flow is simulated inside the rotor, initially with arbitrary thermal boundary conditions. Then a structural thermal model is developed to supply the realistic boundary conditions for the hydrodynamical model. This procedure, with the integrated models, allows to propose and to evaluate configuration changes for a centrifuge minimizing the laboratory phase tests.

Research paper thumbnail of Psychometric model for safety culture assessment in nuclear research facilities

Nuclear Engineering and Design, Apr 1, 2017

h i g h l i g h t s A psychometric model to evaluate 'safety climate' at nuclear research facilit... more h i g h l i g h t s A psychometric model to evaluate 'safety climate' at nuclear research facilities. The model presented evidences of good psychometric qualities. The model was applied to nuclear research facilities in Brazil. Some 'safety culture' weaknesses were detected in the assessed organization. A potential tool to develop safety management programs in nuclear facilities.

Research paper thumbnail of Web-based post-processor for RELAP5: a development based on LabVIEW

International Journal of Nuclear Energy Science and Technology, 2012

This work presents the development of a LabVIEW web-based postprocessor for the RELAP5 output. A ... more This work presents the development of a LabVIEW web-based postprocessor for the RELAP5 output. A RELAP5 model was developed for the thermal-hydraulics experimental facility, called Natural Circulation Circuit. A visual basic for application program (Xtrip) was developed to transform binary data file from RELAP5 in an ASCII file. This new output file can be displayed in user-friendly Graphical User Interfaces (GUIs) of the post-processor. Temperatures are showed in a XY plot as a function of time. Other parameters can be selected and displayed in the same way. Void fractions, levels, and also the temperatures are displayed in colour-coded scales on other GUIs. This postprocessor allows an easier visual understanding of the thermal hydraulics circuit behaviour for calculated and experimental results. One of the main features of this post-processor is the possibility of information interchange, and distance teaching, via the web. In future work, this post-processor will be coupled to RELAP5 for simultaneous calculation and graphical display.

Research paper thumbnail of Análise de temperaturas em um elemento combustível do reator de pesquisas IEA-R1 durante evento de perda lenta de vazão com RELAP

Peer Review

O código RELAP (Reactor Excursion and Leak Analysis Program) é amplamente utilizado para realizar... more O código RELAP (Reactor Excursion and Leak Analysis Program) é amplamente utilizado para realizar análises de acidentes em reatores nucleares de potência ou de pesquisa. O presente trabalho apresenta uma simulação do transiente de perda lenta de vazão no núcleo do reator a partir de um modelo com RELAP para o reator de pesquisas IEA-R1 contemplando a piscina, o núcleo do reator, toda tubulação e válvulas do circuito primário, o tanque de decaimento, bomba de circulação principal, trocador de calor e tubulação de retorno à piscina. A modelagem proposta conseguiu representar toda a fenomenologia do acidente, ou seja, o comportamento das temperaturas desde o início da perda de vazão, desligamento do reator, seguida da abertura da válvula de circulação natural até a reversão da direção do escoamento no núcleo do reator. A comparação com resultados experimentais mostrou diferenças de temperaturas de 2,3°C para o fluido e de até 4°C para o revestimento

Research paper thumbnail of Development of an arduino based real time environmental monitor for animal facilities

Cuadernos de Educación y Desarrollo

Animal facilities are installations of great importance for the advancement of animal research, s... more Animal facilities are installations of great importance for the advancement of animal research, since it is where the activities of animal breeding, maintenance and experimentation are carried out. Based on this assumption, the present dissertation addresses the development of a monitoring system for environmental factors such as temperature, relative humidity, ammonia and luminosity in an automated way through open source hardware and software aiming at a low cost, accessible prototype that will contribute to guarantee animal welfare, the technical management of the facilities, shared monitoring in real time, decision making in case of irregularities in the observed factors and computerized systemic record. After installing the prototype in the breeding room of the IPEN animal facility, tests were carried out with calibrated detectors in order to validate the readings. Our data confirm the positive correlation obtained, thus validating the adoption of the open source sensor as a to...

Research paper thumbnail of Verification and Validation of Seven Turbulence Models for Natural Circulation Loops Under Transient Conditions

Research paper thumbnail of Improving contaminated land data communication through the developing of an environmental indicator

Brazilian Journal of Development

Environment contamination is a widespread problem in all countries around the world. Contaminated... more Environment contamination is a widespread problem in all countries around the world. Contaminated sites are consequence of land use and occupation without environmental concerns, and it can cause contamination of superficial soil, subsoil, and groundwater. This issue affects urban planning, human health as well natural resource availability. The management of contaminated land data and its communication to stakeholders is a significant driver to achieve sustainable urban planning, promoting equally sustainable cities and communities. Therefore, tools to improve comprehension of environmental quality of cities is essential to face this challenge. Here, we develop an environmental indicator to analyze contaminated land data and communicate its complexity to non-technical stakeholders. The indicator developed, adopts 15 variables and considering three parameters: polluting substance concentration, affected environmental matrices, and the environmental behavior of the polluting substa...

Research paper thumbnail of Functional analysis, diversity and defense-in-depth principle applied for instrumentation and control architecture in accordance with U.S.NRC / Análise funcional, diversidade e princípio da defesa em profundidade aplicado à arquitectura de instrumentação e controlo em conformidade com o U.S.NRC

Brazilian Journal of Development

According to IAEA (2020), a large number of nuclear power plants (NPP) is completing 30 to 40 yea... more According to IAEA (2020), a large number of nuclear power plants (NPP) is completing 30 to 40 years of operation, and many of them can extend the lifetime for variable periods of operation. Besides that, new applications and methods of NPP design are in direction of adopting small modular reactors (SMR) to optimize the NPP projects in relation to cost and safety (Black et al., 2021). Other way is to apply NPP in naval plants, providing efficient manners to generate energy (Freire, 2018). All these ways can make nuclear energy a viable alternative, and consequently to contribute with low carbon power demands, and stabilize the global energy matrix helping to meet climate goals in the next decades (IAEA, 2020). One of the sensing points in NPP project nowadays is the introduction of advanced digital I&C technologies (Santos, 2021). In digital I&C design based on nuclear normative basis, it is imperative to be adherent with the safety and human factors engineering (HFE) requirements. T...

Research paper thumbnail of A Preliminary Proposal for a Hybrid Lattice Confinement Fusion-Fission Reactor for Mobile Nuclear Power Plants

Fusion Science and Technology, Mar 1, 2022

Abstract Scientists detected 2.45-MeV neutrons and in smaller yields 4- and 5-MeV neutrons in deu... more Abstract Scientists detected 2.45-MeV neutrons and in smaller yields 4- and 5-MeV neutrons in deuterated metals under a 2.9-MeV electron beam. Such discovery could allow the use of deuterated metals at temperatures below their melting point to provide nuclear fusion reactions. Such reactions could provide fast neutrons and energy in the form of heat. This work analyzed the results of some experiments to infer the neutron multiplication rate in such environments. It also considered the possible roles that such phenomena could play in a commercial nuclear power reactor under economic and compactness constraints. It seems the best way to promote nuclear fusion is the irradiation of deuterated metals by fast neutrons. This work presents the concept of a hybrid fusion–fission reactor using fissile or fertile fuel to generate heat and fast neutrons along deuterated metals providing excess neutrons (reactivity boost). Additionally, deuterated metals also may have a role in neutron moderation requiring less volume than other moderators (water or graphite). Such a reactor, given its reactivity boost, may burn radioactive residuals (transmutation) at affordable costs while generating power. Alternatively, this hybrid fusion–fission concept could also breed fissile fuel from fertile isotopes using natural uranium as seed.

Research paper thumbnail of Fundamentos de proteção radiológica para condução de submarinos nucleares

Research paper thumbnail of Economic evaluation of a mobile nuclear power plant using uranium over 5% enrichment

International Atomic Energy Agency, Mar 17, 2021

Research paper thumbnail of IPEN e a nanotecnologia

SENAI-SP Editora, Oct 6, 2020

Research paper thumbnail of Distribuição de Vazão Entre os Canais de Resfriamento do Elemento Combustível do IEA-R1

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Um elemento de combustível "dummy" instrumentado (DMPV-01) com as mesmas características geométri... more Um elemento de combustível "dummy" instrumentado (DMPV-01) com as mesmas características geométricas de um elemento de combustível MTR foi projetado e construído para experimentos de medição de distribuição de vazão no núcleo do reator IEA-R1. Esse elemento instrumentado também foi usado para medir a distribuição de vazão entre os canais retangulares formados pelas placas do elemento combustível. Duas sondas com tomadas de pressão foram construídas e montadas dentro dos canais de escoamento para medir a queda de pressão, enquanto a velocidade de escoamento foi calculada usando uma equação

Research paper thumbnail of Comparação Entre a Queda de Pressão no DMPV-01 e Queda de Pressão no Núcleo do Reator IEA-R1 Medida Pelo Instrumento do Sistema

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Este trabalho apresenta os resultados de medidas experimentais de queda de pressão realizadas no ... more Este trabalho apresenta os resultados de medidas experimentais de queda de pressão realizadas no reator IEA-R1 com o elemento instrumentado DMPV-01 [1-2]. Essas medidas foram comparadas com as medidas obtidas pelo dispositivo de medida de queda de pressão no núcleo. Desta comparação, concluiu-se que é possível utilizar as medidas do dispositivo de queda de pressão no núcleo para indiretamente estimar a vazão média através dos elementos combustíveis (EC) sem precisar usar o DMPV-01 cada vez que se deseje conhecer a vazão nos EC. A diferença entre as quedas de pressão foi da ordem de 6%, que resulta numa

Research paper thumbnail of Medida de Distribuição de Vazão no Núcleo do Reator IEA-R1 Usando o Elemento DMPV-01

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Research paper thumbnail of Estudos e Ações Corretivas para Aumentar a Vazão do Núcleo Ativo do Reator IEA-R1

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Este trabalho apresenta os estudos experimentais e medidas realizadas no reator IEA-R1, e as prov... more Este trabalho apresenta os estudos experimentais e medidas realizadas no reator IEA-R1, e as providências tomadas visando aumentar a vazão através do núcleo ativo do reator. A diminuição da vazão de desvio foi conseguida melhorando-se o posicionamento dos tampões e refletores de grafite e, também, pela colocação de uma peça, especialmente projetada e construída, na base do EIS obstruindo locais que permitiam a passagem de água. Uma câmera subaquática foi utilizada na investigação do problema. A correção da curva de vazão versus ∆P do bocal de vazão em aproximadamente 13% teve influência direta na vazão pelo núcleo. As medidas de vazão pelo núcleo ativo foram feitas utilizando-se o elemento DMPV-01. Com as providências tomadas, obteve-se um aumento na vazão média pelo núcleo ativo da ordem de 26% (de 15,5 m 3 /h/elemento para 19,5 m 3 /h/elemento).

Research paper thumbnail of Methodology proposal for assessing safety in WSN and IoT devices in nuclear research laboratory

Research paper thumbnail of O IPEN e a saúde

Research paper thumbnail of Fake news oficial: um exemplo do uso da notícia em falso contexto na sociedade em rede

Cuadernos de educación y desarrollo, Jul 31, 2023

RESUMO O objetivo deste artigo é analisar a divulgação do índice do PIB brasileiro, divulgado em ... more RESUMO O objetivo deste artigo é analisar a divulgação do índice do PIB brasileiro, divulgado em 2022, como exemplo do que pode se chamar "fake news oficial", onde a confiabilidade do emissor se sobrepõe ao caráter factível e plausível da informação, necessárias ao fato real. Para isso se baseia nas teorias de Castell, das relações de poder nos processos de comunicação socializada e da desordem da informação. Palavras-chave: comunicação, gestão da informação, sociedade em rede, fake news, informação.

Research paper thumbnail of Thermal Hydraulic Phenomenology for the Heating Process in a Natural Circulation Facility

This work describes thermal hydraulic phenomenology observed for the heating process in a natural... more This work describes thermal hydraulic phenomenology observed for the heating process in a natural circulation facility. Glass made circuit allows observations of the thermal hydraulic processes over several regions. Natural convection, natural circulation, nucleated sub-cooled, saturated boiling and some flow patterns such as, bubbly, slug and churn flow are observed and described. Facility heated and cooled parts are responsible for the natural circulation when in operation. An expansion tank accommodates the fluid density variations due to the temperature changes and void fraction. Instrumentation consists of thermocouples distributed along the circuit. Two differential pressure transducers are used for pressure and level measurements. Instrumentation signals and images are simultaneously acquired to help with phenomenon description. A CCD digital camera at a 250µs shutter speed is used for the images acquisition. Phenomenology described is based on a test under 1.1 x 10 5 W/m 2 of heat flux which corresponds to an electrical heater power of 7000 W and 0.0236 kg/s (85 l/h) of cooling flow rate.

Research paper thumbnail of Thermal hydrodynamical analysis of a countercurrent gas centrifuge

Annals of Nuclear Energy, Jul 1, 1998

The separative effect in a centrifuge is amplified when a countercurrent in the axial direction i... more The separative effect in a centrifuge is amplified when a countercurrent in the axial direction is added to the centrifugal field. The mchanisms used to create this countercurrent are obtained with the gas deceleration near to the waste scoop, mechanical effect, and temperature distribution on the rotor walls, thermal effect. This work treats the influence of the thermal countercurrent on the centrifuge separative performance. A complete centrifuge model is presented, therefore this study passes by the hydrodynamical and thermal phenomena analysis. For the accomplishment of this work the gas flow is simulated inside the rotor, initially with arbitrary thermal boundary conditions. Then a structural thermal model is developed to supply the realistic boundary conditions for the hydrodynamical model. This procedure, with the integrated models, allows to propose and to evaluate configuration changes for a centrifuge minimizing the laboratory phase tests.

Research paper thumbnail of Psychometric model for safety culture assessment in nuclear research facilities

Nuclear Engineering and Design, Apr 1, 2017

h i g h l i g h t s A psychometric model to evaluate 'safety climate' at nuclear research facilit... more h i g h l i g h t s A psychometric model to evaluate 'safety climate' at nuclear research facilities. The model presented evidences of good psychometric qualities. The model was applied to nuclear research facilities in Brazil. Some 'safety culture' weaknesses were detected in the assessed organization. A potential tool to develop safety management programs in nuclear facilities.

Research paper thumbnail of Web-based post-processor for RELAP5: a development based on LabVIEW

International Journal of Nuclear Energy Science and Technology, 2012

This work presents the development of a LabVIEW web-based postprocessor for the RELAP5 output. A ... more This work presents the development of a LabVIEW web-based postprocessor for the RELAP5 output. A RELAP5 model was developed for the thermal-hydraulics experimental facility, called Natural Circulation Circuit. A visual basic for application program (Xtrip) was developed to transform binary data file from RELAP5 in an ASCII file. This new output file can be displayed in user-friendly Graphical User Interfaces (GUIs) of the post-processor. Temperatures are showed in a XY plot as a function of time. Other parameters can be selected and displayed in the same way. Void fractions, levels, and also the temperatures are displayed in colour-coded scales on other GUIs. This postprocessor allows an easier visual understanding of the thermal hydraulics circuit behaviour for calculated and experimental results. One of the main features of this post-processor is the possibility of information interchange, and distance teaching, via the web. In future work, this post-processor will be coupled to RELAP5 for simultaneous calculation and graphical display.

Research paper thumbnail of Análise de temperaturas em um elemento combustível do reator de pesquisas IEA-R1 durante evento de perda lenta de vazão com RELAP

Peer Review

O código RELAP (Reactor Excursion and Leak Analysis Program) é amplamente utilizado para realizar... more O código RELAP (Reactor Excursion and Leak Analysis Program) é amplamente utilizado para realizar análises de acidentes em reatores nucleares de potência ou de pesquisa. O presente trabalho apresenta uma simulação do transiente de perda lenta de vazão no núcleo do reator a partir de um modelo com RELAP para o reator de pesquisas IEA-R1 contemplando a piscina, o núcleo do reator, toda tubulação e válvulas do circuito primário, o tanque de decaimento, bomba de circulação principal, trocador de calor e tubulação de retorno à piscina. A modelagem proposta conseguiu representar toda a fenomenologia do acidente, ou seja, o comportamento das temperaturas desde o início da perda de vazão, desligamento do reator, seguida da abertura da válvula de circulação natural até a reversão da direção do escoamento no núcleo do reator. A comparação com resultados experimentais mostrou diferenças de temperaturas de 2,3°C para o fluido e de até 4°C para o revestimento

Research paper thumbnail of Development of an arduino based real time environmental monitor for animal facilities

Cuadernos de Educación y Desarrollo

Animal facilities are installations of great importance for the advancement of animal research, s... more Animal facilities are installations of great importance for the advancement of animal research, since it is where the activities of animal breeding, maintenance and experimentation are carried out. Based on this assumption, the present dissertation addresses the development of a monitoring system for environmental factors such as temperature, relative humidity, ammonia and luminosity in an automated way through open source hardware and software aiming at a low cost, accessible prototype that will contribute to guarantee animal welfare, the technical management of the facilities, shared monitoring in real time, decision making in case of irregularities in the observed factors and computerized systemic record. After installing the prototype in the breeding room of the IPEN animal facility, tests were carried out with calibrated detectors in order to validate the readings. Our data confirm the positive correlation obtained, thus validating the adoption of the open source sensor as a to...

Research paper thumbnail of Verification and Validation of Seven Turbulence Models for Natural Circulation Loops Under Transient Conditions

Research paper thumbnail of Improving contaminated land data communication through the developing of an environmental indicator

Brazilian Journal of Development

Environment contamination is a widespread problem in all countries around the world. Contaminated... more Environment contamination is a widespread problem in all countries around the world. Contaminated sites are consequence of land use and occupation without environmental concerns, and it can cause contamination of superficial soil, subsoil, and groundwater. This issue affects urban planning, human health as well natural resource availability. The management of contaminated land data and its communication to stakeholders is a significant driver to achieve sustainable urban planning, promoting equally sustainable cities and communities. Therefore, tools to improve comprehension of environmental quality of cities is essential to face this challenge. Here, we develop an environmental indicator to analyze contaminated land data and communicate its complexity to non-technical stakeholders. The indicator developed, adopts 15 variables and considering three parameters: polluting substance concentration, affected environmental matrices, and the environmental behavior of the polluting substa...

Research paper thumbnail of Functional analysis, diversity and defense-in-depth principle applied for instrumentation and control architecture in accordance with U.S.NRC / Análise funcional, diversidade e princípio da defesa em profundidade aplicado à arquitectura de instrumentação e controlo em conformidade com o U.S.NRC

Brazilian Journal of Development

According to IAEA (2020), a large number of nuclear power plants (NPP) is completing 30 to 40 yea... more According to IAEA (2020), a large number of nuclear power plants (NPP) is completing 30 to 40 years of operation, and many of them can extend the lifetime for variable periods of operation. Besides that, new applications and methods of NPP design are in direction of adopting small modular reactors (SMR) to optimize the NPP projects in relation to cost and safety (Black et al., 2021). Other way is to apply NPP in naval plants, providing efficient manners to generate energy (Freire, 2018). All these ways can make nuclear energy a viable alternative, and consequently to contribute with low carbon power demands, and stabilize the global energy matrix helping to meet climate goals in the next decades (IAEA, 2020). One of the sensing points in NPP project nowadays is the introduction of advanced digital I&C technologies (Santos, 2021). In digital I&C design based on nuclear normative basis, it is imperative to be adherent with the safety and human factors engineering (HFE) requirements. T...

Research paper thumbnail of A Preliminary Proposal for a Hybrid Lattice Confinement Fusion-Fission Reactor for Mobile Nuclear Power Plants

Fusion Science and Technology, Mar 1, 2022

Abstract Scientists detected 2.45-MeV neutrons and in smaller yields 4- and 5-MeV neutrons in deu... more Abstract Scientists detected 2.45-MeV neutrons and in smaller yields 4- and 5-MeV neutrons in deuterated metals under a 2.9-MeV electron beam. Such discovery could allow the use of deuterated metals at temperatures below their melting point to provide nuclear fusion reactions. Such reactions could provide fast neutrons and energy in the form of heat. This work analyzed the results of some experiments to infer the neutron multiplication rate in such environments. It also considered the possible roles that such phenomena could play in a commercial nuclear power reactor under economic and compactness constraints. It seems the best way to promote nuclear fusion is the irradiation of deuterated metals by fast neutrons. This work presents the concept of a hybrid fusion–fission reactor using fissile or fertile fuel to generate heat and fast neutrons along deuterated metals providing excess neutrons (reactivity boost). Additionally, deuterated metals also may have a role in neutron moderation requiring less volume than other moderators (water or graphite). Such a reactor, given its reactivity boost, may burn radioactive residuals (transmutation) at affordable costs while generating power. Alternatively, this hybrid fusion–fission concept could also breed fissile fuel from fertile isotopes using natural uranium as seed.

Research paper thumbnail of Fundamentos de proteção radiológica para condução de submarinos nucleares

Research paper thumbnail of Economic evaluation of a mobile nuclear power plant using uranium over 5% enrichment

International Atomic Energy Agency, Mar 17, 2021

Research paper thumbnail of IPEN e a nanotecnologia

SENAI-SP Editora, Oct 6, 2020

Research paper thumbnail of Distribuição de Vazão Entre os Canais de Resfriamento do Elemento Combustível do IEA-R1

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Um elemento de combustível "dummy" instrumentado (DMPV-01) com as mesmas características geométri... more Um elemento de combustível "dummy" instrumentado (DMPV-01) com as mesmas características geométricas de um elemento de combustível MTR foi projetado e construído para experimentos de medição de distribuição de vazão no núcleo do reator IEA-R1. Esse elemento instrumentado também foi usado para medir a distribuição de vazão entre os canais retangulares formados pelas placas do elemento combustível. Duas sondas com tomadas de pressão foram construídas e montadas dentro dos canais de escoamento para medir a queda de pressão, enquanto a velocidade de escoamento foi calculada usando uma equação

Research paper thumbnail of Comparação Entre a Queda de Pressão no DMPV-01 e Queda de Pressão no Núcleo do Reator IEA-R1 Medida Pelo Instrumento do Sistema

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Este trabalho apresenta os resultados de medidas experimentais de queda de pressão realizadas no ... more Este trabalho apresenta os resultados de medidas experimentais de queda de pressão realizadas no reator IEA-R1 com o elemento instrumentado DMPV-01 [1-2]. Essas medidas foram comparadas com as medidas obtidas pelo dispositivo de medida de queda de pressão no núcleo. Desta comparação, concluiu-se que é possível utilizar as medidas do dispositivo de queda de pressão no núcleo para indiretamente estimar a vazão média através dos elementos combustíveis (EC) sem precisar usar o DMPV-01 cada vez que se deseje conhecer a vazão nos EC. A diferença entre as quedas de pressão foi da ordem de 6%, que resulta numa

Research paper thumbnail of Medida de Distribuição de Vazão no Núcleo do Reator IEA-R1 Usando o Elemento DMPV-01

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Research paper thumbnail of Estudos e Ações Corretivas para Aumentar a Vazão do Núcleo Ativo do Reator IEA-R1

Contribuições do Reator IEA-R1 para a Pesquisa Nuclear: II Workshop Anual do Reator de Pesquisas – WARP 2, 2022

Este trabalho apresenta os estudos experimentais e medidas realizadas no reator IEA-R1, e as prov... more Este trabalho apresenta os estudos experimentais e medidas realizadas no reator IEA-R1, e as providências tomadas visando aumentar a vazão através do núcleo ativo do reator. A diminuição da vazão de desvio foi conseguida melhorando-se o posicionamento dos tampões e refletores de grafite e, também, pela colocação de uma peça, especialmente projetada e construída, na base do EIS obstruindo locais que permitiam a passagem de água. Uma câmera subaquática foi utilizada na investigação do problema. A correção da curva de vazão versus ∆P do bocal de vazão em aproximadamente 13% teve influência direta na vazão pelo núcleo. As medidas de vazão pelo núcleo ativo foram feitas utilizando-se o elemento DMPV-01. Com as providências tomadas, obteve-se um aumento na vazão média pelo núcleo ativo da ordem de 26% (de 15,5 m 3 /h/elemento para 19,5 m 3 /h/elemento).

Research paper thumbnail of Methodology proposal for assessing safety in WSN and IoT devices in nuclear research laboratory

Research paper thumbnail of O IPEN e a saúde