Which constraint impacts sustained fission within a pressurized heavy-water reactor?

💡 Explanation

The neutron moderation efficiency limits sustained fission because insufficient moderation leads to neutron capture without further fission events; therefore self-sustaining reaction ends, rather than variations in cooling or cladding performance under standard operating temp constraints.

• Which outcome occurs when thermally excited electrons reach tunnel barrier limits?
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• Which mechanism impairs silicon photovoltaic cell efficiency at elevated temperatures?
• Which outcome results when elevated boiler pressure reduces the proportional controller ‘gain’ Kp?