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fuel rods and control rods
No, but control rods do.
No, control rods are not a part of the fuel assemblies in nuclear reactors. They are separate "pieces" in the core, and essentially fit in "spaces" between fuel bundles.
Most likely they would warp and jam, however damage to fuel rods is likely from overheating long before any effect on control rods.
No, Enriched Uranium-235 is used in a nuclear reactor as the fuel in the fuel rods and boron is used in the control rods.
Meltdown, also it's not just the fuel rods that melt, structural supports, control rods, etc. can melt when this happens.
Heavy water
Perhaps you mean the water that acts as moderator and fuel coolant
shielding, fuel, control rods, moderator, and coolant
You must be talking about a CARBURETOR. They are called metering rods. They control how much fuel flows through the jets in the carburetor as you push the gas pedal. They can make a engine run lean or rich, by changing the air/fuel ratio.
Known as fuel rods, these are hollow metal rods that contain the uranium fuel for a nuclear reactor.
Nuclear fuel rodsFuel rods are long, cylindrical rods or long, flat plates containing fissile material (usually uranium) in a nuclear reactor core. The uranium is in rods or plates so it can be bundled into a fuel element and fixed in place to make up the core. The spacing and arrangement of the rods and, beyond that, the bundles themselves, is the key to reactor geometry.Other rods in the reactor called control rods are also moved into channels in the reactor core, but these have the opposite effect. They contain neutron-absorbing materials that can moderate (or stop) the fission reaction that takes place when a critical mass is achieved. Control rods are pulled to start the reactor up, and are put back in to shut the reactor down.