Failure analysis of cold neutron source in-pile parts

A newly constructed CNS facility at a research reactor adopts liquid hydrogen as moderator. Because the CNS facility in-pile parts was installed in reflector vessel,which is very closed to reactor core, the safety of CNS facility especially the in-pile parts is very important to the reactor. This paper analyzes the status of CNS in-pile parts in various conditions(including failure) and the accident consequences. The results show that the failure of the in-pile parts is limited to the CNS facility, which has no effect on the reactor safety. (authors)