Naval Nuclear Power. MM1(SS) Ryan Reed Nuclear Field Coordinator NRD Michigan. POWER GENERATION BREAKDOWN. 55% COAL 22% NUCLEAR 10% NATURAL GAS 9% HYDRO 3% PETROL. 1% SOLAR, WIND, BIOMASS, GEOTHERMAL. What is nuclear power?.
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Naval Nuclear Power
MM1(SS) Ryan Reed
Nuclear Field Coordinator
What is nuclear power?
Extracting usable energy from atomic nuclei via controlled nuclear reactions.
Nuclear power plants use a series of physical barriers to make sure radioactive material cannot escape. In today’s water-cooled reactors, the first barrier is the fuel itself: the solid ceramic uranium pellets.
The pellets are sealed in zirconium rods.
What causes fission to occur?
Basic Nuclear Reaction (Fission)
= energy released (heat)
= Fission Products
THREADED SHAFT FOR DRIVE MOTOR
CONTROL RODS ARE MADE OF A MATERIAL
WITH A VERY HIGH PROBABILITY OF
NEUTRON ABSORPTION, USUALLY BORON
OR HAFNIUM. THIS ALLOWS THE CONTROL
RODS TO BE RAISED AND LOWERED IN THE
REACTOR CORE TO CONTROL THE RATE AT
WHICH FISSION OF U-235 OCCURS. THE RODS
ARE CONTROLLED AS A GROUP BY MOTORS
AND ELECTRONICS FROM A LOCATION AWAY
FROM THE REACTOR.
TOP VIEW OF REACTOR CORE WITH CONTROL
RODS AND FUEL CELLS
The Nuclear Reactor
We then convert the heat from the fission reaction to steam in a steam generator. The primary coolant passes through tubes which have cooler secondary coolant sprayed on them. The secondary coolant flashes to high pressure steam.
The steam then flows down a pipe where it will turn generators to generate electricity and on ships to turbines. The steam will spin the turbines at a high rate of speed. This will be reduced by reduction gears to a useful speed to turn the shaft and ultimately the screw on a ship or submarine to propel the vessel through the water.
NUCLEAR REACTOR OPERATION
GAMMA RAYS - no electric charge,
ALPHA PARTICLES - identical to a
Helium-4 atom, ingestion hazard.
BETA PARTICLES - electron with a
- or + charge.
NEUTRON - no electric charge.
Average exposure working with nuclear power: 150mrem/yr
Average exposure received in the United States: 360mrem/yr
Medical X-rays: 60mrem/dose
put in your pocket
hold in your hand
a Alpha particle
b- Beta particle