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Accident # | 78747 |
State Police # | 05-02910 |
Accident Date | 2005-05-03 |
Report Date | 2005-05-05 |
Follow-up Date | 2005-06-16 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 239 h 35 m | Hydrocracker, Coker, CR-1 and NHT units | NO | YES | NO | 296.2 pounds |
Volatile Organic Compounds (VOCs) | 239 h 35 m | Hydrocracker, Coker, CR-1 and NHT units | NO | NO | YES | 1,303.7 pounds |
Accident Classified As: Below Reportable Quantity (BRQ)
The Coker, Hydrocrack, and CR-1 process units unexpectedly shut down due to a loss of 100# instrument air. The instrument air block valve on the line supplying the Coker, Hydrocracker, and CR-1 was mistakenly closed. An operator was instructed to close the 2" soft water valve for maintenance and operator mistakenly identified the 2" 100# instrument air valve as the 2" soft water valve.
The instrument air system is owned and operated by ShellChemical LP -- Norco Chemical Plant -- East Site personnel; Motiva has no operation control over the instrument air system.
Remedial actions involved shutting down the affected operating units; found that Sulfur Dioxide levels were exceeded from the HCU flare and Volatile Organic Compounds exceeded at the Coker Flare.
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