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→Proposed Expansion - Unit 3
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On July 31, 2007 Constellation Energy filed an application to the NRC to review its plans to build a new nuclear power plant, [http://www.unistarnuclear.com/projects/cc3.htm Calvert Cliffs Nuclear Power Plant 3 (CCNPP 3)] based on the [[AREVA]] U.S. [[Evolutionary Power Reactor]]<ref>{{cite web
|url=http://www.areva-np.com/scripts/info/publigen/content/templates/show.asp?p=1655&l=us&sync=y
|title=EPR: the first generation III+ reactor currently under construction
}}</ref>, four loop pressurized water reactor. This is the first application made in the US in almost 30 years. The CCNPP 3 reactor will be rated at 4590 MW thermal/1710 MW electrical gross. Plant loads will be approximately 110 Mwe, thus the net generation is 1600 MWe net. Plant thermal efficiency will be approximately 36% (ratio of 1710 MWe to 4590 MWth).
The plant will be located south of the existing CCNPP 1&2 and will be set back from the shoreline. Although only a single unit, its power plant footprint will be almost 2 times the size of the twin units CCNPP 1&2. It will have a closed-loop cooling system using a single hybrid mechanical draft cooling tower. It will incorporate plume abatement (no visible water vapor plume). Units 1&2 use an open-cycle heat dissipation system (no cooling towers). Two thirds of the heat produced by the Unit 3 reactor will be released to the atmosphere via the cooling tower. This also is a saturated steam plant with a Main Steam Turbine (one high pressure turbine in tandem with three low pressure turbines) and a Main Generator design similar to Unit 1 & 2. [[ALSTOM]] will supply the Main Steam Turbine and Main Generator.
Units 1 and 2 and their support facilities use a well water system for their potable water supply. It consists of five wells that pump water from the second highest aquifer, the Aquia Aquifer, at the minus 400-500 foot below sea level elevation. The State of Maryland limits daily usage for these five wells to 450,000 gallons per day (gpd). Actual daily usage averages 225,000 gpd.
Unique to Unit 3 will be a desalination plant to produce potable water using reverse osmosis. The desalination plant will produce up to 1,250,000 gallon of potable water per day for Unit 3 and supporting facilities with total dissolved solids (TDS) less than 400 parts per million (ppm). The source for the desalination plant will be the [[brackish]] bay water from the makeup supply to the circulating water system. The TDS for the brackish bay water runs 10,000-15,000 ppm. The potable water will be distributed as makeup water for the demineralized water system, miscellaneous potable water services, fire protection and source water for the four ultimate heatsink cooling towers used during normal shutdown and power operation.
On November 13, 2007, Unistar Nuclear Energy and UniStar Nuclear Operations, which is a wholly-owned subsidiary of UniStar Nuclear Operations, filed an application for a certificate of public convenience and necessity with the Maryland Public Service Commission for authority to construct CCNPP 3. This application, which is being considered in Case Number 9127, includes a schedule showing plant construction being completed in July 2015 and commercial operation in December 2015.
On January 29, 2008, Constellation Energy announced that its partial construction and operating license (COL) for the proposed Unit 3 has been docketed by the U.S. Nuclear Regulatory Commission (NRC). This means that the NRC has determined the application is technically correct and ready for detailed review. Constellation announced it may begin ground breaking prior to the applications final approval by the NRC provided a federal loan guarantee by the U.S. Department of Energy (DOE) is assured. A final decision by Constellation to start construction will not take place for 12-18 months or mid-2009.
== Public Safety and Security ==
