Utah Winter Sports Park - Executive Summary |
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Background The Utah Winter Sports Park, located in Bear Hollow, Utah, is classified as a "Program 3" under the Risk Management Program (RMP) because of the Occupational Health and Safety Organizations (OSHA) requirement for a Process Safety Management (PSM) Plan. The Park utilizes approximately 110,000 pounds of anhydrous ammonia in a closed-loop refrigeration system used to provide cooling for a 1,600 meter bobsled/luge course. 5-Year Accident History The Utah Winter Sports Park is expected commenced operations in the Fall of 1996, and has not had any accidents over the past five years. Offsite Consequence Analysis Theoretical ammonia release scenarios were developed to estimate the impacts to local citizens in the community and spectators during the games. Ammonia concentrations were estimated using the air dispersion model Areal Location of Hazardous Atmospheres (ALOHA) version 5.2, which uses both Gaussian and heavy gas algorithms. One worst-case and one alternative c ase release scenario was developed. The worst-case release assumes that the entire ammonia charge is released into the atmosphere during pessimistic meteorological conditions, and the alternative case assumes the ammonia supply and return lines are completely ruptured. All scenarios assume the release occurs for 10 minutes, and in the alternative cases, shut-off valves function as active mitigation devices to prevent additional release. The distance to the 0.14 milligram per liter toxic endpoint for ammonia (from the American Industrial Hygiene Associations Emergency Response Planning Guidelines Level 2) exceeds the distance to the nearest receptor (approximately 0.6 miles) for all release scenarios considered. The worst-case release is conservatively predicted to reach the toxic endpoint at a distance of 5.0 miles from the facility, and the alternative release at 1.0 miles. The population estimated to reside within the worst case release distance is 6,400, and with the alterna tive distance, 400. Receptors within one mile of the facility include single family residences, Parleys Elementary School, several churches, and numerous single family residences under construction along Highway 224. During the games, 20,000 spectators are expected for the bobsled/luge events, and 30,000 spectators are expected for the ski jumping events. A retreat lodge, located south east of the site, is believed to be the nearest offsite receptor. Prevention Program The Program 3 Prevention Program contains identical elements as the Occupational Safety and Health Administrations (OSHA) Process Safety Management (PSM) Plan as required by 29 Code of Federal Regulations (CFR) 1910 and is referenced accordingly in the RMP. |