Speaker
Jae Hyun Kim
(Nuclear Engineering)
Description
The pre-conceptual design concept on the Korean fusion demonstration reactor (K-DEMO) has been studied in Korea since 2012. In the fusion reactor, neutrons produced from fusion reactions cause activation of fusion reactor devices. For the safety of fusion devices and workers during operation and maintenance, it is important to calculate activation and to evaluate shutdown dose rate (SDR). In this study, SDR for K-DEMO global model was evaluated and compared with two different computational methods called rigorous 2-step (R2S) method and direct 1-step (D1S) method. In the R2S method, cell-wised activation calculation was performed by coupling transport code MCNP and activation code FISPACT. On the other hand, in the D1S method, neutron and delayed gamma transport calculations were simultaneously performed using point-wised MCNP calculations. The SDR was calculated in the four positions of the K-DEMO global model, two inside the vacuum vessel and two outside, at 7 cooling times. The results show that SDR results using D1S method were slightly higher comparing to the results using R2S method. This tendency was higher inside the vacuum vessel than outside. The detailed comparison and explanation is presented in this paper. These results will be able to be utilized to establish further detailed activation analysis procedures for designing maintenance and decommissioning schemes of K-DEMO.
Co-authors
Chang Ho Shin
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Do Hyun Kim
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Gi Young Han
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Jae Hyun Kim
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Jong Sung Park
(DEMO Technology, National Fusion Research Institute, Daejeon, South Korea)
Kihak Im
(DEMO Technology, National Fusion Research Institute, Daejeon, South Korea)
Myeong Hyeon Woo
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Song Hyun Kim
(Nuclear Engineering, Hanyang University, SEOUL, South Korea)
Sungjin Kwon
(DEMO Technology, National Fusion Research Institute, Daejeon, South Korea)
