[1A04-08] Engineered Barrier

[1A06] Impact on geological disposal due to prolonged cooling period of spent fuel before reprocessing and study of mitigation measures

(3) Effects for the re-saturation phenomena of buffer material

*Masakazu Chijimatsu¹, Takao Ikeda², Yasuhiro Suyama³, Susumu Tosha⁴, Kazuyoshi Takenobu⁵, Susumu Sakashita⁶, Junji Imai⁷, Atsushi Horio⁸, Takamasa Kanda⁹, Takashi Takei¹⁰ (1. Hazama Ando Corporation, 2. JGC JAPAN, 3. Kajima, 4. IHI, 5. ATK, 6. OYO, 7. JX Metals R.E.&D., 8. Dia Nippon Engineering Consultants, 9. Maeda, 10. ENAA)

Keywords:Geological disposal, Vitrified waste, Cooling period before reprocessing, Buffer material, Re-saturation phenomena

It is known that engineered barrier temperature and safety are affected by changes in the radioactive inventory of the vitrified waste and changes in heat generation due to the prolonged cooling period before reprocessing of spent fuel. Therefore, we investigated the effect of the prolonged cooling period before reprocessing of spent fuel on the re-saturation behavior of buffer materials. As a result of the evaluation by coupled thermal and hydraulic analysis, although there was a large difference in the temperature change inside the buffer, the re-submersion time did not change significantly.