Basic analyses and a comparison of the characteristics of the GCFR and the LMFBR with the thorium cycle in one - group diffusion theory
Description
A preliminary study of neutronics characteristics of thorium cycle fast breeder reactors has been done using simplified reactor models and analyses methods with the aim of finding a type of breeder reactor suitable for an efficient utilization of thorium that is abundant in Brazil. Basic methods of cross section processing and reactor calculation are studied and applied to analyze breeding characteristics of GCFRs and LMFBRs. The GCFR is fueled with oxide pins and cooled with helium. The LMFBR is fueled with thin metallic pins to achieve high power densities. Neutronics characteristics are determined as functions of the average power density and the fuel volume fraction. Results show that a high power density and a high fuel volume fraction are desirable to achieve short doubling times, that the GCFR is inferior to the LMFBR in regard to the doubling time and that the LMFBR can achieve reactor doubling times ten years with an average power density of - 600MW/m3 and a fuel volume fraction of 40%. (Author)
Availability note (English)
Available from IPEN, Sao Paulo, Brazil.Abstract (Portuguese)
Um estudo preliminar das caracteristicas neutronicas dos reatores regeneradores rapidos com o ciclo do torio e feita, utilizando modelos e metodos simplificados de analise de reatores, com a finalidade de encontrar um tipo de reator regenerador adequado com uma eficiente utilizacao do torio, que e abundante no Brasil. Sao estudados metodos basicos de calculos de seccoes de choque e do reator e sao aplicados para analise das caracteristicas de regeneracao dos GCFRs e LMFBRs. O GCFR e alimentado com o combustivel oxido e refrigerado a helio. O LMFBR e alimentado com combustivel metalico para alcancar altas densidades de potencia. As caracteristicas neutronicas sao determinadas como funcoes da densidade de potencia media e da fracao de volume do combustivel. Os resultados mostram que uma alta densidade de potencia e uma alta fracao de volume sao desejaveis para se atingir curtos tempos de dobramento, que o GCFR e inferior ao LMFBR em vista do tempo de dobramento e que o LMFBR pode atingir tempos de dobramento da ordem de dez anos com uma densidade de potencia media de 600MW/m3 e uma fracao do volume de 40%. (Autor)Additional details
Additional titles
- Original title (Portuguese)
- Analise basica e comparacao das caracteristicas do GCFR e LMFBR com o ciclo do torio pela teoria de difusao em um grupo de energia
Publishing Information
- Imprint Pagination
- 225 p.
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 14762023
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Resource subtype / Literary indicator
- Thesis, Non-conventional Literature
- Descriptors DEI
- BREEDING; COMPARATIVE EVALUATIONS; CROSS SECTIONS; FBR TYPE REACTORS; FUEL PINS; GCFR TYPE REACTORS; HELIUM; LMFBR TYPE REACTORS; POWER DENSITY; SIMULATION; THORIUM CYCLE
- Descriptors DEC
- BREEDER REACTORS; ELEMENTS; EPITHERMAL REACTORS; FAST REACTORS; FUEL CYCLE; FUEL ELEMENTS; GAS COOLED REACTORS; LIQUID METAL COOLED REACTORS; NONMETALS; NUCLEAR FUEL CONVERSION; RARE GASES; REACTOR COMPONENTS; REACTORS