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|State Police #||05-02910|
|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.