Sökning: "THORIUM"

Visar resultat 1 - 5 av 35 avhandlingar innehållade ordet THORIUM.

  1. 1. Improved PWR Core Characteristics with Thorium-containing Fuel

    Författare :Cheuk Wah Lau; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; load-following; PWR; Thorium; xenon poisoning; core calculations;

    Sammanfattning : Thorium is an element for possible use as nuclear fuel, because of the fertile property of Th-232, which could convert into U-233 after neutron capture and beta decays. However, thorium based fuels have not been successfully implemented, because of the high cost and the higher complexity compared with once-through uranium fuel. LÄS MER

  3. 2. Thorium fuels for light water reactors - steps towards commercialization

    Författare :Klara L Insulander Björk; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Halden research reactor; light water reactors; fuel performance; plutonium; Thorium; neutronic simulations;

    Sammanfattning : Thorium-containing nuclear fuel is proposed as a means of gaining a number of benefits in the operation of light water reactors, some related to the nuclear properties of thorium and some related to the material properties of thorium dioxide. This thesis aims to investigate some of these benefits and to widen the knowledge base on thorium fuel behaviour, in order to pave the way for its commercial use. LÄS MER

  4. 3. Complexation of Thorium with Phosphates and Silicates under Repository Conditions

    Författare :Andreas Knutsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; AKUFVE; Liquid-liquid extraction; Silicates; Complexation; Stability Constants; Thorium; Phosphates;

    Sammanfattning : In order to make reliable performance assessments of the safety for planed underground repositories for spent nuclear fuel large amounts of chemical thermodynamical data is needed. In some cases the databases used for modeling the migration behavior of radionuclides in groundwater is missing data. LÄS MER

  5. 4. Investigation of the use of thorium in LWRs for improving reactor core performance

    Författare :Cheuk Wah Lau; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thorium; thermal margin; light water reactor;

    Sammanfattning : Thorium is a fertile material and most of the past research has focused on breeding thorium into fissile material to achieve a more sustainable use of nuclear power. However, the focus in this report is on using thorium to improve reactor core performance. LÄS MER

  7. 5. The radium distribution in some Swedish soils and its effects on radon emanation

    Författare :Cecilia Edsfeldt; KTH; []
    Nyckelord :distribution; emanation; extraction; glacial till; podzol; Ra; radium; radon; Rn; sequential soil; spodosol; Th; thorium; U; uranium; variability;

    Sammanfattning : The aim of this study has been to clarify how the radiumdistribution in soils affects the radon emanation. Thedistribution of radium, uranium and thorium has been determinedusing sequential extractions. In the study, soils from twodifferent locations were investigated. LÄS MER