Abstract
The passive containment cooling system (PCS) is used to remove the heat out of the containment after accident in XUDAPU NPP. When PCS and containment spray system are not available after severe accident, the pressure of containment will raised to high level and the hydrogen igniters will not able to burn the hydrogen in the containment. Venting the containment through pipe link to the spent fuel storage pool is to be considered in this situation according to SAMG. The hydrogen in the containment will release to the spent fuel pool located in fuel building when venting the containment is performed, and there will be risk of hydrogen burning or explosion in the fuel building. This paper analyzed the process and phenomenon when the strategy of containment venting the containment is performed, and the hydrogen risk in the fuel building is evaluated. The results shows that there is risk of hydrogen burn in the fuel building when there is not any mitigate measure. XUDAPU NPP has added some hydrogen recombiners in the containment and the hydrogen risk has been eliminated.
