coal2thorium.com                                  Electricity from Thorium
Chapter  18-E        Power Plant Examples:    BC Cobb          Directory
The purpose of this page is to explore converting a typical example of thousands of average coal burning power plants to thorium.
Located on navigable water, BC Cobb is the Michigan power plant the author is using for his "World Bank Poorest Country" template.
Thorium reactor barges, combined with multiple generic air cooled supercritical turbogenerators promise abundant affordable electricity to the world's poorest countries.

 B.C. Cobb, Muskegon, Michigan  http://www.cmsenergy.com/content.aspx?id=1028 
Example: Converting
A 500 MVA Coal Burning Power Plant to Nuclear
(May have Hydrogen Cooled Generating Units in the 150 - 400 MVA size range)  
An excellent subject for
single reactor, multiple turbine "Over-Repowering"

The U.S. Environmental Protection Agency is developing a number of new regulations for the power sector governing air emissions, cooling water intake structures, and coal combustion waste disposal methods.  Combined, these regulation have the potential to drive as much as 40% of existing coal-fired generating units to retire in the next 10 years, representing about 51 GW. - - Power Magazine, May 2011.

 

Part  1:  The Muskegon, MI, BC Cobb Power Plant
Part  2:  Costly Carbon Emissions Compliance and non-mega metro America.
Part  3:  Converting BC Cobb's coal and natural gas burning boilers to nuclear.
Part  4:  The economics of converting from coal to nuclear.

3-1  Multiple turbines powered by a single large reactor.

 

 

Part  1:  The Muskegon, MI, BC Cobb Power Plant

 

Example:  500 MVA BC Cobb, Muskegon Michigan.  Three 60 MVA Gas fired steam, Two 160 MVA Coal fired steam.

Consumers Energy, One Energy Plaza, Jackson, MI 49201, (phone) (517) 788-0550  http://www.cmsenergy.com/content.aspx?id=1028 


After converting the 5 smaller steam units to ORNL-TN-1060 nuclear, an additional 380 MVA generator could be added.
6 steam units from a single hot tub reactor.  A world record for sure.

How BC Cobb could run multiple steam turbines from one large BN hot tub reactor.

1,000 mWe ORNL-MT-1060 nuclear boiler.

Part  2:  Costly Carbon Emissions Compliance and non-mega metro America.

Part  3:  Converting BC Cobb's coal and natural gas burning boilers to nuclear.

BC Cobb's Boilers
The boilers have to supply the following steams

BC Cobb has 5 generating units: three 60 MVA gas-fired 3 stage steam turbines, two 160 MVA coal fired 3 stage steam turbines.

The three identical 60 MWe gas-fired boilers are designed for a safe drum operating pressure of   - - - - psig and can produce about  - - - - lb/hr of steam continuously at  - - - -  psig and  - - - -  °F at the superheater outlet when supplied with feedwater at    - - - -  °F at the economizer inlet.  The steam outlet temperatures of the superheater and high temperature reheater are both  - - - -  °F, and the pressures are  - - - -  psig (superheater) and  - - - -  psig (reheater). 

The two identical 160 MWe coal-fired boilers are designed for a safe drum operating pressure of   - - - - psig and can produce about  - - - - lb/hr of steam continuously at  - - - -  psig and  - - - -  °F at the superheater outlet when supplied with feedwater at    - - - -  °F at the economizer inlet.  The steam outlet temperatures of the superheater and high temperature reheater are both  - - - -  °F, and the pressures are  - - - -  psig (superheater) and  - - - -  psig (reheater). 

 (have note stating 950 psig)

(Note: Boilers can be rated in either (or both) MegaWatts thermal and MegaWatts electrical, depending upon the final application.  Electrical generators are rated in Mega Volt-Amperes or MVA.  A watt is one Volt-Ampere, so "MegaWatts" is also used.)

All in service as of Dec, 2010.

1948     69 MW      ST
1948     69 MW      ST
1950     69 MW      ST
1956   156.3 MW   ST
1957   156.3 MW   ST

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Part  4:  The economics of converting from coal to nuclear.

Example: Converting 5 Small Power Plant Boilers to Nuclear

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BACKGROUNDER:  Contemplating today's Cost of Coal heat vs. Cost of Nuclear heat

Nuclear heat is 20 times cheaper than coal heat

"Enriched uranium is sold by a unit called a Separative Work Unit (SWU) that is a "made up" number used to describe the amount of effort that went into separating the U-235 atoms from the U-238 atoms. The higher the enrichment, the more SWUs were needed to achieve that separation and the higher the cost (for the same number of pounds). To buy the uranium from a uranium enrichment plant, you will have to buy it in the form of uranium hexafluoride which will run about $1,000 per pound for about 4% enriched material. To buy the uranium from a nuclear fuel fabricator as finished reactor fuel in fuel rods and fuel assemblies, that would roughly triple the cost of the  uranium.

So, a single uranium fuel pellet has the same energy value as three [3.5 per NEI] barrels of oil. Each pellet weighs about 2 grams. Based on a cost of $3000 per pound and there are 453 grams in a pound, then each pound of uranium fuel is worth about 675 barrels of oil which is currently going for about $62,500.

Therefore, uranium fuel is cheaper than oil by about a factor of 20.  Source(s):  I am a nuclear engineer."
Above copied from: http://answers.yahoo.com/question/index?qid=20080115151540AApbV23 

"A single uranium fuel pellet the size of a fingertip contains as much energy as 17,000 cubic feet of natural gas, 1,780 pounds of coal or 149 gallons of oil." - Nuclear Energy Institute.

Pound for pound, uranium makes 3 million times as much heat as coal but does not cost 3 million times as much to mine and manufacture. - JH

Here's how far cheaper heat from uranium makes repowering PAY BIG TIME !

 

 

 

 

 

 

 

 

 

 

(Click either chart to enlarge.)   Notice the fuel cost component on the left chart - light tan - for coal, gas, and nuclear.

Notice that in the left chart, coal fuel is 80% of the cost of making electricity, and nuclear fuel is 26% of the cost of making electricity - using Generation II nuclear technology.  In the chart at the right, it cost 2.75 cents to produce a kiloWatt-hour of electricity by burning coal in a coal boiler while it cost 1.87 cents to produce the same amount of electricity from a nuclear boiler.

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B.C. Cobb's Opportunities
(Based upon publicly available information)

1.  B.C. Cobb's Coal Consumption

The world average coal price was about US$100 per delivered Ton in December, 2010. 

Since one ton of coal will produce 3.6 tons of CO2, B.C. Cobb's 744,357 tons of CO2 (CARMA, 2007) were produced by burning 267,985 tons of coal, which is costing them about US$ 27 million per year or $270 million for 10 years. 

If B.C. Cobb obtained two 25 MWe Hyperion reactors ($50 million each for 10 years of full-power heat) and completely stopped using coal, (and ran 100% of the time at 50 MWe) they would save about $170 million ($270m - $100m) over the 10 year reactor runs - or $17 million per year.    I must have made a mistake somewhere?

The neat thing about converting an existing power plant to nuclear - other than saving a ton of money - is that, if desired, by adding steam selector valves at the turbine, they could have a nuclear/coal dual fuel power plant.

Many fuel experts expect the cost of coal to double over the next five years.

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2. Carbon Mitigation Credits

Carbon Mitigation Credits are going for about €19 (Euros) - US$25 - per ton these days.

According to CARMA ( www.CARMA.org ), B.C. Cobb could mitigate as much as 744,357 tons of CO2 per year. 

As of December, 2010, Carbon Capture and Storage (CCS) has been accepted by the Clean Development Mechanism (CDM) of the Kyoto Protocol as a valid method of mitigating Global Warming gasses and thus is eligible for Carbon Mitigation Credits. 

There is no provision at this time for nuclear repowering, the parallel mitigation method for fossil fuel power plant emissions.   Kyoto - UN Accepts CCS .pdf

If carbon mitigation credits were realized by converting from coal to nuclear, that would add US$ 18.6 million per year to B.C. Cobb's revenue stream.

 

BACKGROUNDER:

Making the Case for Nuclear Repowering in the
Kyoto Protocol's Clean Development Mechanism (CDM)
http://en.wikipedia.org/wiki/Clean_Development_Mechanism       http://new.globalccsinstitute.com/

It might be more to everyone's benefit if we begin with repowering the supersized power plants in those developing countries that have them.

2 cash streams come immediately to mind when thinking about CO2 mitigation via nuclear repowering. 

1.  Nuclear heat is 20 times cheaper than coal heat. 

2.  Carbon mitigation credits are going for about €19 (Euros) (US$25) per ton these days, with market highs of 33.35 and lows of 7.93.

Speaking of Carbon Capture and Sequestration technology as a candidate for Carbon Mitigation Credits:

"If CCS would be accepted as a method for reducing the emission of GHG's into the atmosphere a CCS project could generate an additional income stream to cover its investment and operating cost from the sale of Certified Emission Reductions (CERs) used within the CDM system as the unit of measure for one ton of CO2e that did not go into the atmosphere." - - Henk Sa and Lodewijk Nell, Carbon Capture Journal, Nov-Dec 2010, p-6.  (See: http://www.carboncapturejournal.com/index.php )

- The decision to include CCS projects under the CDM came in the dawn hours of the closing day of climate talks at the UN Convention on Climate Change (UNFCCC) in Mexico.   Kyoto - UN Accepts CCS .pdf

 

If something as "iffy" as CCS is acceptable as a carbon mitigation technology, nuclear repowering should be a certainty.

The optimal "developing country" supersized power plant would be on navigable water, burning imported coal.  That sounds like the world's biggest CO2 emitter, Taichung, in Taiwan to me.  China is a non-annex 1 signatory to the Kyoto Protocol, i.e., a developing country.

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3.  Carbon Tax

Currently a U.S. peer-reviewed carbon tax of $12 per ton is being discussed. 

For 744,000 tons CO2 per year, that would come to about $9 million per year.

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4.  Carbon Capture Cost if B.C. Cobb decided to continue to burn coal

Postcombustion Carbon Capture and Storage will, according to Vattenfall, cost between $25 to $75 per ton or between $ 6.7 million to $20 million per year.  

About 25% of the CO2 will slip past the capture equipment and the capture equipment itself will suck off about 25% of B.C. Cobb's electricity.  In addition, the liquid captured CO2 will have to be transported and injected into the ground somewhere.

CO2 is lethal in concentrations above 10% so there will have to be some sort of insurance to protect against a Bhopal type of leakage accident.  Small earthquakes are cited as being the most probable cause of a leak.

 

Carbon Capture CO2 Slippage Credits?

 

If, according to the Waxman-Markey Bill, the EPA is going to allow as much as 50% of the CO2 slip past the Carbon Capture equipment, shouldn't a coal plant that converted to nuclear get a similar CO2 credit? 

This could go a long way toward using a conventional small slow reactor such as Westinghouse's IRIS for establishing saturated steam pressure and then obtaining superheat and reheat from a natural gas boiler.

20% CO2 slippage is being talked about as about being as good as it will get.

 

 

 

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5.  

 

B.C. Cobb's Coal Consumption

Australia's thermal coal prices, a benchmark for Asia, rose to a 2010 record above $US116 per tonne Dec 7 2010.  The world average coal price was about US$100 per delivered Tonne in December, 2010.  It is predicted that coal will soon double in price.

Since one tonne of coal will produce 3.6 tonnes of CO2, B.C. Cobb's 2,565,679 tonnes of CO2 (2007) were produced by burning 712,688 tons of coal, which cost about US$ 71 million. 

If realized nuclear heat cost is .33 of coal, that would reduce B.C. Cobb's fuel bill by about 47 million US dollars each year.

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2. The Carbon Mitigation Credits

Carbon Mitigation Credits are going for about €19 (Euros) - US$25 - per ton these days.

According to CARMA ( www.CARMA.org ), B.C. Cobb could mitigate as much as 41,300,000 tons of CO2 per year. 

As of December, 2010, Carbon Capture and Storage (CCS) has been accepted by the Clean Development Mechanism (CDM) of the Kyoto Protocol as a valid method of mitigating Global Warming gasses and thus is eligible for Carbon Mitigation Credits.  There is no provision at this time for nuclear repowering, the parallel mitigation method for fossil fuel power plant emissions.    Kyoto - UN Accepts CCS .pdf

If carbon mitigation credits were realized by converting from coal to nuclear, that would add US$ 64 million dollars per year to B.C. Cobb's revenue stream.

Carbon Capture CO2 Slippage Credits?

 

If, according to the Waxman-Markey Bill, the EPA is going to allow as much as 50% of the CO2 slip past the Carbon Capture equipment, shouldn't a coal plant that converted to nuclear get a similar CO2 credit? 

This could go a long way toward using a conventional small slow reactor such as Westinghouse's IRIS for establishing saturated steam pressure and then obtaining superheat and reheat from a natural gas boiler.

20% CO2 slippage is being talked about as about being as good as it will get.

 

 

 

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3. Total improvement in B.C. Cobb's cash flow would be about US$ 111 million per year minus the cost per year of the conversion to nuclear.

 

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