The safety in a cold neutron source (CNS) includes nuclear safety

radiation safety and hydrogen safety

with the latter being the most comprehensive. In general

the safety design of defence in depth implies defence levels and multiple physical barriers on the hydrogen system of CNS

in order to minimize the possibility of formation of a hydrogen-oxygen mixture. The implementation of the safety concept of defence in depth in a CNS under construction is presented

and it implies the design can ensure the hydrogen safety in the CNS.