Colver Power Project - Executive Summary |
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Executive Summary Introduction: The Colver Power Project (CPP) is a 103.5-Megawatt MW (net) waste bituminous coal fired electric production facility. This facility utilizes a circulating fluidized bed boiler that produces 785,000 pounds of steam per hour at 10000F, at a pressure of 2525 psi. The electrical energy is supplied to General Public Utilities. The facility uses anhydrous ammonia and propane, which are considered hazardous by the EPA. These substances meet the minimum requirements set forth in the EPA Risk Management Plan under the Clean Air Act Amendments, Section 112(r) and are covered processes under the act. The Accidental Release Prevention and Emergency Policies: The policy at the Colver Power Project is to adhere to all applicable federal and state rules and regulations to prevent unnecessary human exposure, to reduce the threat to our own employees, contractor employees, and to reduce the risk to nearby members of the community. Safe operations of the processes which use anhydrous ammonia and propane depends on the manner in which we manage these substances, combined with the safety devices inherent in each process design, handling procedures, inspection procedures, maintenance procedures and the proper training of employees in all of the procedures. The Stationary Sources and Regulated Substances Handled: Anhydrous Ammonia The anhydrous ammonia is used in oxides of nitrogen (Nox) control. This process is referred to a "Selective Non-Catalytic Reduction" (SNCR). Nox are generated in the combustion chamber when waste coal is fired. Oxides of nitrogen flow with other flue gases in the flue gas stream, o ut of the combustion chamber through the cyclone, cyclone outlet and backpass, baghouse and out the stack. The Nox analyzer located on the stack, activates the anhydrous ammonia injection system via the Bailey DCS. Injector ports located at the cyclone inlet inject anhydrous ammonia into the flue gas stream and reduces the amount of Nox emitted into the atmosphere. Anhydrous ammonia is stored onsite in a single above ground tank with a water capacity of 12,000 gallons. The tank is located outdoors, 30 feet east of the baghouse. Facility administrative controls limit the maximum storage capacity to no more than 75% which is equal to 46,443 pounds or (9000 gallons) of Anhydrous Ammonia. For reporting purposes this amount rounds to 46,400 pounds. Two unmanned monitors (water cannons) are located strategically near the ammonia storage tank. One is 100 feet southwest, the other 75 feet norteast. Note: The Worst Case Release and Alternative Release for Anhydrous Ammonia were b ased on the following: Reference tables in OCA Guidance RMP Guidance for POTWs (Waste Water) LandView 3 Program USGS Maps Propane Propane is used as a fuel source to supply propane vapor to the Coal Fluidized Bed (CFB) Start-Up Burners, the Fuel Drying System Burner, and the Limestone Prep Drying Systems. Propane is stored on site in three individual above ground tanks. Each tanks has a 10,000-gallon water capacity. The tanks are located outdoors, 70 feet east of the main baghouse. Facility administrative controls limit the maximum storage capacity for each tank to no more than 85%. This equals 107,865 pounds (25,500 gallons) for each tank for each tank. The total storage is equal to 323,595 pounds (76,500 gallons). For reporting purposes this amount rounds to 324,000 pounds (77,000 gallons) of propane. All three propane tanks are protected by a water deluge system. Note: The Worst Case Release and Alternative Release for Propane were based on the following: Ref erence tables in OCA Guidance RMP Guidance for POTWs (Waste Water) RMP Guidance for Propane Storage Facilities LandView 3 Program USGS Maps Worst-Case-Release Scenario(s) and Alternative Release Scenario(s) for Anhydrous Ammonia: Anhydrous Ammonia -- Worst-Case-release Scenario The worst-case scenario for anhydrous ammonia assumes the failure of the 12,000-gallon storage tank when filled to the greatest amount of 9,000 gallons (46,443 pounds). It is assumed that the entire 46,443 pounds of anhydrous ammonia would be released over a 10 minute period (4644 lbs./minute). A distance to the end point was calculated at 3.88 miles using equation A-9 of Appendix 4A of the Waste Water Treatment Plant Guidance document. The distance to the endpoint represents the maximum downward distance (direction-independent) that could be affected by a release. This release will travel beyond the facility boundary. Anhydrous Ammonia--Alternative Release Scenario: The alternative release scenario assumes a flashing liquid is released from a 3/16 inch diameter opening. Equation 14 from the Waste Water Treatment Plant Guidance document was used to calculate a release rate of 66 lbs./minute through the hole. An endpoint of 0.16 miles was calculated using equation A-9 of Appendix 4A of the Waste Water Treatment Plant guidance document. This release will travel beyond the facility boundary. Worst-Case-Release Scenario(s) and Alternative Release Scenario(s) for Propane: Propane -- Worst-Case-release Scenario Worst case release scenario for propane assumes 108,000 pounds of propane (25,500 gallons) is released instantaneously and detonated. As suggested in the RMP Guidance For Propane Storage Facilities document, the distance to the 1 psi overpressure endpoint was calculated using equation C-1 of the Offsite Consequence Analysis guidance documents. Per the EPA's guidance, a 10% yield was assumed. The distance to the overpressure endpoint is .38 miles. Propane -- Alte rnative Release Scenario The alternative release scenario assumes that 54,000 pounds of propane is instantaneously released and detonated. Equation C-1 of the Offsite Consequence Analysis guidance documents was used to calculate the distance to the 1 psi overpressure endpoint. Per the EPA's guidance, a 3% yield was assumed. The distance to the overpressure endpoint is .18 miles The General Accident Release Prevention Program and Chemical-Specific Prevention Steps: This facility complies with EPA's accident prevention rule and all applicable state and local codes and regulations. Propane: The Propane System is designed, installed, and maintained in accordance with NFPA-58. Anhydrous Ammonia: The Anhydrous Ammonia System Complies with the OSHA 29 CFR 1910.119 Process Safety Management. 5-Year Accident History: The Colver Power Project (CPP) is a 7- year old facility and as such does not have a history of accidental releases of any regulated EPA substances. The dates stipulated below represents the 5-year period which has been selected and coincides with the RMP submittal. The 5-year period runs from: May 1, 1994 - April 30, 1999 The Emergency Response Program: The emergency response program is based on facilities "Preparedness and Prevention and Contingency Plan" which includes procedures for the notification of key facility management personnel and the following agencies: - Pennsylvania Department of Environmental Resources (PADER) - Ebensburg Office (Local Office) - Pennsylvania Fish and Boat Commission - Cambria County Emergency Management Agency - Cambria County Hazmat Team - Local Fire Department - Police Department Planned Changes to Improve Safety There are no current changes, immediate changes or improvements planned for either process (Anhydrous Ammonia or Propane). |