Answer :
Final answer:
In a nuclear power reactor, water typically reaches temperatures of about 300 degrees Celsius, with safety and practicality preventing higher operational temperatures.
Explanation:
The water in a nuclear power reactor typically reaches temperatures of about 300 degrees Celsius. This is due to the intense heat generated by nuclear fission reactions and the pressurized conditions within the reactor, which allow water to remain liquid above its standard boiling point. However, operating at even higher temperatures is generally not practical because of material limitations that ensure the reactor remains safe and manageable.