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This lecture on Nuclear Steam Supply Systems (NSSS) begins by contrasting thermal power plants, which burn fossil fuels directly to heat water into steam, with nuclear plants that harness controlled fission in the reactor core to generate heat without combustion. The following topics will be discussed:

• Overview of NSSS main design features including safety containment, high-pressure operation, and redundant cooling;
• NSSS as the integrated system encompassing the reactor pressure vessel, coolant pumps, pressurizer, and steam generators that transfer fission heat to produce steam for turbines;
• Key Reactor Coolant System components like fuel assemblies, control rods, primary loop piping, and their looped arrangement for efficient heat removal and circulation;
• Emphasis of NSSS's role in safe, reliable electricity generation.

_{Previously determined topics for this lecture included:}

_{The fourth lecture will present various safety standards.}

• _{What is a Standard / Code?}
• _{IAEA safety standards}
• _{International Standard and Code}