nuclear energy 101...let’s build a nuclear power plant condenser turbine/ generator pump in a...
TRANSCRIPT
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The American Nuclear Society
Nuclear Energy 101
11/20/2014 ANS Congressional Seminar Series
1
Credit: W. D. Pointer, Ph. D
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Shippingport Reactor Vessel
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We’re going to wrestle with some big questions
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We’re going to wrestle with some big questions
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We’re going to wrestle with some big questions
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We’re going to wrestle with some big questions
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We’re going to wrestle with some big questions
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Let’s get started
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Why do we need more energy?
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Elec
tric
ity E
nabl
es H
uman
Dev
elop
men
t
11/20/2014 ANS Congressional Seminar Series
Energy use is shown in Tonnes of Oil Equivalent (or TOE) Visualization from Gapminder World, powered by Trendalyzer from www.gapminder.org
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Elec
tric
ity E
nabl
es H
uman
Dev
elop
men
t
11/20/2014 ANS Congressional Seminar Series
Energy use is shown in Tonnes of Oil Equivalent (or TOE) Visualization from Gapminder World, powered by Trendalyzer from www.gapminder.org
![Page 13: Nuclear Energy 101...Let’s Build a Nuclear Power Plant Condenser Turbine/ Generator Pump In a nuclear power plant, the reactor core replaces the burning fossil fuel as the energy](https://reader036.vdocuments.site/reader036/viewer/2022080718/5f78ca55ecfe357c5875de6f/html5/thumbnails/13.jpg)
Elec
tric
ity E
nabl
es H
uman
Dev
elop
men
t
11/20/2014 ANS Congressional Seminar Series
Energy use is shown in Tonnes of Oil Equivalent (or TOE) Visualization from Gapminder World, powered by Trendalyzer from www.gapminder.org
![Page 14: Nuclear Energy 101...Let’s Build a Nuclear Power Plant Condenser Turbine/ Generator Pump In a nuclear power plant, the reactor core replaces the burning fossil fuel as the energy](https://reader036.vdocuments.site/reader036/viewer/2022080718/5f78ca55ecfe357c5875de6f/html5/thumbnails/14.jpg)
As
natio
ns d
evel
op th
ey m
ove
up a
nd to
the
right
11/20/2014 ANS Congressional Seminar Series
Energy use is shown in Tonnes of Oil Equivalent (or TOE) Visualization from Gapminder World, powered by Trendalyzer from www.gapminder.org
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Per C
apita
Use
is In
form
ativ
e, B
ut C
an B
e M
isle
adin
g
11/20/2014 ANS Congressional Seminar Series
Energy use is shown in Tonnes of Oil Equivalent (or TOE) Visualization from Gapminder World, powered by Trendalyzer from www.gapminder.org
![Page 16: Nuclear Energy 101...Let’s Build a Nuclear Power Plant Condenser Turbine/ Generator Pump In a nuclear power plant, the reactor core replaces the burning fossil fuel as the energy](https://reader036.vdocuments.site/reader036/viewer/2022080718/5f78ca55ecfe357c5875de6f/html5/thumbnails/16.jpg)
Why do we need NUCLEAR energy?
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U.S. Electric Generation in 1998
52%
3%
15%
19%
9% 2%
CoalPetroleumNatural GasNuclearHydroelectricOther Renewables
Source: Electric Power Annual 2010 U.S. Energy Information Administration
3.620 BILLION Megawatthours Total
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U.S. Electric Generation in 2010
45%
1%
24%
20%
6% 4%
CoalPetroleumNatural GasNuclearHydroelectricOther Renewables
Source: Electric Power Annual 2010 U.S. Energy Information Administration
4.125 BILLION Megawatthours Total
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U.S. Electric Generation in 2011
42%
1%
25%
19%
8% 5%
CoalPetroleumNatural GasNuclearHydroelectricOther Renewables
Source: Electric Power Annual 2010 U.S. Energy Information Administration
4.105 BILLION Megawatthours Total
13.4% INCREASE since 1998
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Let’s move on to a truly important energy engineering question.
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How does your coffee pot work?
Why does the water pour out of your coffee pot’s filter basket into the pot below?
How does the water you put into your coffeepot go from the tank to the filter basket?
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Coffee Pots: The Naked Truth
Water absorbs energy
Water’s density decreases with temperature Steam’s density is MUCH
lower than liquid water
Hot, low density water rises to filter basket Added energy enables
water to do some useful work
Energy 11/20/2014 ANS Congressional Seminar Series
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What does this have to do with NUCLEAR ENERGY?
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How is a Power Plant like a Coffee Pot? This is worth a closer look.
Energy
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How is a Power Plant like a Coffee Pot? First, we won’t need a coffee pot in a power plant.
Energy
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Next we should probably look at things from a different angle.
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How is a Power Plant like a Coffee Pot? We need a bigger heat source than a coffee pot’s hot plate. Now let’s make some electricity!
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How is a Power Plant like a Coffee Pot? How do we control how much electricity we make?
Condenser
Turbine/ Generator
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How is a Power Plant like a Coffee Pot? How do we control how much electricity we make?
Condenser
Turbine/ Generator
Pump
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How is a Power Plant like a Coffee Pot? A closer look at a coal fired power plant.
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How is a nuclear power plant different?
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It’s the Fuel!
Nuclear power plants use the energy stored in the nucleus of large atoms rather than the energy stored in weaker chemical bonds.
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It’s the Fuel!
150 Tons of Uranium
2,100,000 Tons of Coal
10,000,000 Barrels of Oil
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It’s the Fuel!
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The spent fuel used to generate all of the energy used in one American’s lifetime would fit in here
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Images: Original art by Dave Pointer
What is Nuclear Fission?
If the nucleus of a heavy atom (such as Uranium) absorbs a neutron, the nucleus can become unstable and split.
This is called NUCLEAR FISSION.
Neutron
Uranium Nucleus
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Images: Original art by Dave Pointer
What is Nuclear Fission?
The nucleus splits in two halves and
releases some neutrons, and
radiation
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Images: Original art by Dave Pointer
What is Nuclear Fission?
During fission, a small amount of
mass is lost. This mass is
transformed into ENERGY, which is
also released.
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Let’s Build a Nuclear Power Plant
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
First, ceramic fuel pellets are manufactured from uranium ore
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
The ceramic fuel pellets are stacked in a column
And sealed inside a metallic alloy case, called the cladding, to form a fuel rod
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
The fuel rods are grouped together in a regular array or fuel assembly
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
The fuel rods are grouped together in a regular array or fuel assembly
The fuel assemblies are arranged in a larger regular array or reactor core
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
The fuel rods are grouped together in a regular array or fuel assembly
The fuel assemblies are arranged in a larger regular array or reactor core
The reactor core is contained inside a heavy steel reactor pressure vessel (RPV)
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A Reality Check Fuel Assembly and Reactor Core Design are Complex Engineering Challenges
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
The fuel rods are grouped together in a regular array or fuel assembly
The fuel assemblies are arranged in a larger regular array or reactor core
The reactor core is contained inside a heavy steel reactor pressure vessel (RPV)
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
Condenser
Turbine/ Generator
Pump
In a nuclear power plant, the reactor core replaces the burning fossil fuel as the energy source
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
Condenser
Turbine/ Generator
Pump
Control rods absorb neutrons and are used to stop/start the reaction
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Let’s
Bui
ld a
Nuc
lear
Pow
er P
lant
Condenser
Turbine/ Generator
Pump
Control rods absorb neutrons and are used to stop/start the reaction
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What’s so CRITICAL?
CRITICAL → k=1 # of Neutrons Produced = # of Neutrons Absorbed
SUB-Critical → k<1 # of Neutrons Produced < # of Neutrons Absorbed
SUPER-Critical → k>1 # of Neutrons Produced > # of Neutrons Absorbed
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Boili
ng W
ater
Rea
ctor
(BW
R)
Condenser
Turbine/ Generator
Pump
39 of the 104 nuclear power plants in the U.S. look like this
They’re called BWRs or Boiling Water Reactors
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Pres
suriz
ed W
ater
Rea
ctor
(PW
R)
Condenser
Turbine/ Generator
Pump
Pump Most U.S. nuclear power plants are PWRs or Pressurized Water Reactors
Steam is made in a steam generator rather than directly in the reactor core
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PWR
Cont
ainm
ent
Condenser
Turbine/ Generator
Pump
Pump
The entire reactor sits inside a large concrete and steel containment building
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Pressurized Water Reactor
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BWR
Cont
ainm
ent
The entire reactor sits inside a large concrete and steel containment building
Condenser
Turbine/ Generator
Pump
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Boiling Water Reactor
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POP QUIZ!!!
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BWR
Cont
ainm
ent
The entire reactor sits inside a large concrete and steel containment building
Condenser
Turbine/ Generator
Pump
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Boiling Water Reactor
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What have we left out?
Instrumentation
Systems for optimizing efficiency Control system components used by
operators Steam system components for
thermodynamic efficiency
Equipment to support outages and refueling
Safety Systems
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A few words about SAFETY
Two primary safety functions
Contain radioactive material to protect the public Many layers of containment
Maintain ability to cool the fuel Emergency Core Cooling
Systems to move additional cooling water through the core during accident scenarios
Pumps driven by offsite power Backup battery power Backup diesel generators
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Advanced Reactors Generation III+ reactors have more safety systems that are driven by
natural forces like gravity and natural convection. Less susceptible to interruptions in offsite power and less reliant on
backup diesel generators Small Modular Reactors
Generation IV reactors use alternative coolants such as helium, liquid metals, or molten salts. Operate at higher temperatures
and offer improved efficiency Stronger passive safety features
which rely on natural forces Enable alternative fuel cycles
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Progress in China – January 29 Photo
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Nuclear Energy 101 Questions?
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Nuclear Energy 101 Questions?
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Nuclear Energy 101 Questions?
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