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Sawa, Kazuhiro*; Haseda, Masaya*; Aihara, Jun
Nihon Kikai Gakkai Rombunshu (Internet), 89(921), p.22-00314_1 - 22-00314_6, 2023/05
In high temperature gas-cooled reactors (HTGRs), Tri-isotropic (TRISO)-coated fuel particles are employed as fuel. In the high burnup coated fuel particle, stress due to fission gas pressure and irradiation-induced pyrolytic carbon (PyC) shrinkage is introduced into the coating layers and consequently the stress could cause failure of coating layers under high burnup irradiation condition. A failure model has developed to predict failure fraction of TRISO-coated particle under high burnup irradiation. In the model, failure probability is strongly dependent on the irradiation characteristics of PyC. This paper describes the outline of the failure model and evaluation result of high burnup fuel irradiation experiment by the model.
Haseda, Masaya*; Aihara, Jun; Sawa, Kazuhiro*
no journal, ,
Failure probability of coated fuel particles (CFPs) of high temperature gas-cooled reactors (HTGRs) under irradiation is strongly dependent on irradiation characters of pyrolytic carbon (PyC) layers of CFPs. But it is very difficult to newly obtain irradiation data of PyC layers with experiments. Therefore, in the past study, it was suggested to calculate failure probabilities based on a report summarizing irradiation data obtained at various irradiation temperatures of PyC layers of various Bacon anisotropy factor (BAF), and on result of failure probability measurement of irradiation test of the High Temperature Engineering Test Reactor (HTTR) fuel. Then a BAF of PyC layers of Japanese CFPs was suggested to use to calculate failure probability of Japanese CFPs. In this study, it was clarified that the failure probability calculated under condition of an irradiation test of Japanese CFPs other than above one, and using above BAF does not fit the experimental result.
Sawa, Kazuhiro*; Haseda, Masaya*; Aihara, Jun
no journal, ,
In high temperature gas-cooled reactors (HTGRs), Tri-isotropic (TRISO)-coated fuel particles are employed as fuel. In the high burnup coated fuel particle, stress due to fission gas pressure and irradiation-induced pyrolytic carbon (PyC) shrinkage is introduced into the coating layers and consequently the stress could cause failure of coating layers under high burnup irradiation condition. A failure model has developed to predict failure fraction of TRISO-coated particle under high burnup irradiation. In the model, failure probability is strongly dependent on the irradiation characteristics of PyC. This paper describes the outline of the failure model and evaluation result of high burnup fuel irradiation experiment by the model.
