Environmental Engineering Reference
In-Depth Information
HOLD DOWN SPRING
ROD CLUSTER CONTROL
TOP NOZZLE
FUEL ROD
CONTROL ROD
THIMBLE TUBE
GRID
MIXING VANES
BULGE JOINTS
DASHPOT REGION
DIMPLE
GRID SPRING
THIMBLE SCREW
BOTTOM NOZZLE
Figure 8.3
Light water reactor (PWR) fuel assembly (Courtesy of the Nuclear Regulatory
Commission)
that did not fission. The uranium is radioactive but emits mostly alpha and beta
particles and low-energy gamma rays. Not much shielding would be required to
absorb the radiation from uranium. Approximately 3 percent of the used fuel is
fission products, the two nuclei formed when U-235 fissions. Some of these are
radioactive, emitting very energetic gamma rays and accounting for most of the
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