Development of air cooling performance evaluation method for fuel debris on retrieval of Fukushima Daiichi NPS by dry method, 2; Outline of numerical method and preliminary analysis of free convection around fuel debris

Yamashita, Susumu; Uesawa, Shinichiro; Yoshida, Hiroyuki

Proceedings of 10th Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-10) (USB Flash Drive), 7 Pages, 2016/11

In fuel debris retrieval in decommissioning of the Fukushima Daiichi NPS, dry method is under consideration. Investigation of the cooling performance of fuel debris in the dry method will be very important problem to realize the method. However, there are uncertainties in the shape and surface temperature of fuel debris. In order to evaluate the cooling performance, the investigation of the cooling performance by free convection is required. We have been developing the numerical simulation method, which can evaluate the cooling performance of the fuel debris by free convection, using the JUPITER code in JAEA. In this paper, we show the evaluation result of the thermal conductivity by the free convection from fuel debris to the atmosphere in the simplified system.

Development of air cooling performance evaluation method for fuel debris on retrieval of Fukushima Daiichi NPS by dry method, 1; Outline of research project

Yoshida, Hiroyuki; Uesawa, Shinichiro; Yamashita, Susumu; Nagase, Fumihisa

Proceedings of 10th Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-10) (USB Flash Drive), 7 Pages, 2016/11