Study on the effect of long-term high temperature irradiation on TRISO fuel

Shaimerdenov Asset; Gizatulin Shamil; Dyussambayev Daulet; Askerbekov Saulet; Ueta Shohei; Aihara Jun; Shibata Taiju; Sakaba Nariaki

doi:10.1016/j.net.2022.02.026

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자료유형: 학술저널

저자정보: Shaimerdenov Asset (The Institute of Nuclear Physics) Gizatulin Shamil (The Institute of Nuclear Physics) Dyussambayev Daulet (The Institute of Nuclear Physics) Askerbekov Saulet (The Institute of Nuclear Physics) Ueta Shohei (Japan Atomic Energy Agency) Aihara Jun (Japan Atomic Energy Agency) Shibata Taiju (Japan Atomic Energy Agency) Sakaba Nariaki (Japan Atomic Energy Agency)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제8호

발행연도: 2022.8

수록면: 2,792 - 2,800 (9page)

DOI: 10.1016/j.net.2022.02.026

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In the core of the WWR-K reactor, a long-term irradiation of tristructural isotopic (TRISO)-coated fuel particles (CFPs) with a UO2 kernel was carried out under high-temperature gas-cooled reactor (HTGR)- like operating conditions. The temperature of this TRISO fuel during irradiation varied in the range of 950 e1100 C. A fission per initial metal atom (FIMA) of uranium burnup of 9.9% was reached. The release of gaseous fission products was measured in-pile. The release-to-birth ratio (R/B) for the fission product isotopes was calculated. Aspects of fuel safety while achieving deep fuel burnup are important and relevant, including maintaining the integrity of the fuel coatings. The main mechanisms of fuel failure are kernel migration, silicon carbide corrosion by palladium, and gas pressure increase inside the CFP. The formation of gaseous fission products and carbon monoxide leads to an increase in the internal pressure in the CFP, which is a dominant failure mechanism of the coatings under this level of burnup. Irradiated fuel compacts were subjected to electric dissociation to isolate the CFPs from the fuel compacts. In addition, nondestructive methods, such as X-ray radiography and gamma spectrometry, were used. The predicted R/B ratio was evaluated using the fission gas release model developed in the high-temperature test reactor (HTTR) project. In the model, both the through-coatings of failed CFPs and as-fabricated uranium contamination were assumed to be sources of the fission gas. The obtained R/B ratio for gaseous fission products allows the finalization and validation of the model for the release of fission products from the CFPs and fuel compacts. The success of the integrity of TRISO fuel irradiated at approximately 9.9% FIMA was demonstrated. A low fuel failure fraction and R/B ratios indicated good performance and reliability of the studied TRISO fuel

#TRISO #WWR-K #Graphite matrix #High burnup #Fuel integrity

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