In a BWR, how is steam produced?

In a BWR, how is steam produced?

• A. Steam is produced directly in the reactor vessel because water acts as both coolant and moderator.
• B. Steam is generated in a separate steam generator.
• C. Steam is not produced in BWRs.
• D. Steam produced after the reactor is scrammed.

Answer: (A)

In a boiling water reactor, steam is produced directly in the reactor vessel because water serves both as coolant and moderator, and the heat from fission boils the water inside the core. This boiling creates steam that goes directly to the turbine. There’s no separate steam generator in a BWR—the steam is generated in the core region itself and then routed to the turbine, with liquid water returning to the reactor via the recirculation/condensation loop. The idea that steam isn’t produced in BWRs is incorrect, and the notion that steam only forms after a scram doesn’t reflect normal operation, where boiling and steam production occur while the reactor is running.

In a boiling water reactor, steam is produced directly in the reactor vessel because water serves both as coolant and moderator, and the heat from fission boils the water inside the core. This boiling creates steam that goes directly to the turbine. There’s no separate steam generator in a BWR—the steam is generated in the core region itself and then routed to the turbine, with liquid water returning to the reactor via the recirculation/condensation loop. The idea that steam isn’t produced in BWRs is incorrect, and the notion that steam only forms after a scram doesn’t reflect normal operation, where boiling and steam production occur while the reactor is running.