核能發電會否消耗氧氣？

Commercial nuclear power reactors make use of nuclear fission of enriched uranium-238 as fuel. The reaction process doesn't required any oxygen molecules.
In the heat exchanger, the heated water at around 350'C from the reactor is used to heat up water in another circuit (the secondary circuit), turnung it into steam to drive the turbines. This process is a normal heat exchange and vapourization process that only involves the transfer and absorption of heat/ Since the absorption of latent heat by water doesn't require the presence of oxygen. Hence, there is no consumption of oxygen.
In fact, nuclear reactors (usually of pressurized water reactor type) are installed in nuclear submarines, where the supply of oxygen is very very limited. This is just an advantage for not requiring any oxygen in using nuclear reactor in producing electricity to power the submarine.

核能發電原則上不會消耗氧氣，其過程根本與氧氣無關。而以重氫聚變之發電更可能會產生氧氣。