Speaker
Description
The Water Cooled Ceramic Breeder (WCCB) blanket is one of the blanket candidates for Chinese Fusion Engineering Test Reactor (CFETR). In case of in-box LOCA, the cooling channels inside the blanket module are broken, causing leakage and vaporization of the high temperature and high pressure water coolant into the Beryllium pebble beds which are used as neutron multiplier. Then the Be-steam reaction will take place and impact the safety of the blanket system, as well as the fusion reactor. Therefore the safety characteristics of the WCCB blanket during in-box LOCA should be investigated to prevent serious damage. In this paper, RELAP5 which is a system analysis code, is employed to model the blanket modules and the Primary Heat Transfer System (PHTS) of blankets. And the in-box LOCA is simulated by RELAP5 to figure out the transient response of the blanket system with different break areas. Then parameters, such as the steam flow rate at the break, pressure and temperature are transferred to ANSYS CFX for the simulation of the Be-steam reaction in the Be pebble beds. The results show that the impact of hydrogen production is limited. And the system can response in time to mitigate the consequences. Some improvement measures for the WCCB blanket system are recommended.
| Eligible for student paper award? | No |
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