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Coated fuel particle integrity analysis

Kaplanmış yakıt parçacıklarının bütünlük analizi

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  1. Tez No: 216732
  2. Yazar: OYA ÖZDERE GÜLOL
  3. Danışmanlar: PROF. DR. ÜNER ÇOLAK
  4. Tez Türü: Doktora
  5. Konular: Nükleer Mühendislik, Nuclear Engineering
  6. Anahtar Kelimeler: nuclear reactor, nuclear fuel, high temperature reactor, coated fuel particle, TRISO, kernel migration
  7. Yıl: 2007
  8. Dil: İngilizce
  9. Üniversite: Hacettepe Üniversitesi
  10. Enstitü: Fen Bilimleri Enstitüsü
  11. Ana Bilim Dalı: Nükleer Enerji Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 191

Özet

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Özet (Çeviri)

High Temperature Reactors (HTRs) are among the candidates of the possible next generation nuclear plants. HTRs are expected to offer attractive features such as inherent safety, low cost of electricity generation, and short construction period. The safety performance of high temperature gas cooled reactors mainly relies on the quality and integrity of the coated fuel particles. In this study, mechanisms that may lead to pressure vessel failure of a coated fuel particle are analyzed. In addition to internal pressure rise due to increasing concentration of fission product gases with burnup, mechanisms that stand out are migration of the kernel of the fuel particle and failure due to reactivity insertion accident. The analysis is composed of mechanical and thermal parts. Mechanical analysis is performed to obtain stress distribution inside the load bearing layers. Particle failure fraction can be obtained from those stresses. Thermal analysis predicts the temperature distribution inside the coated fuel particle, from which internal pressure load on the structural layers is calculated. This study consists of three major parts, which are the IAEA (International Atomic Energy Agency) Benchmark Study CRP-6 (Coordinated Research Project 6), kernel migration analysis and analysis of fuel failure due to reactivity insertion accident. CRP-6 study of the IAEA is used to benchmark the coated fuel particle model and its analysis methodology. The results obtained for the CRP-6 study are consistent with those of the other participants. Kernel migration is one of the failure mechanisms of a coated fuel particle. The amount of migration of the kernel is calculated and the response of the load bearing layers are analyzed for different operating temperatures. Results of the analysis showed that the effect of kernel migration itself is not so critical on fuel failure as of pressure vessel failure. Reactivity insertion accident is one of the design basis accidents of HTRs. The scenario analyzed in this study assumes withdrawal of one of the control rods and consequent reactivity insertion. The power level reaches a significant value and then decreases slightly during the accident. The analysis shows that reactor can stabilize its power level at a constant value in the absence of reactivity control systems due to temperature feedbacks. Another result of the analysis is the significant increase in temperature as a result of positive reactivity insertion. Temperature increase as high as 200 C may cause tensile stress on the SiC layer, which increases the failure probability of the coated fuel particle.

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