Heat analysis on the initial reference design of ZrCo hydride beds for ITER

Abstract To develop ZrCo hydride beds for the SDS and the LTS of the ITER, detailed design of the internal structural arrangement and the vessel of the SDS and LTS beds (Korea initial reference design) were implemented by using the ASME VIII, Division 1 pressure vessel design code. In order to validate this initial reference of the ZrCo hydride beds, the following heat analyses were performed: (i) heating performance of a ZrCo hydride packed bed during delivery operation, (ii) cooling performance (decay heat removal, etc.) to reduce the ZrCo hydride temperature during storage operation, (iii) thermal shielding performance for reduction of outer vessel surface temperature. The present paper provides the results of these heat analyses and discusses the effects of the endothermic and exothermic reactions (ZrCo + 1/2T 2  ↔ ZrCoT + 80.5 kJ/mol (T 2 )), and that of cooling by using He gas.