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Valero (26003), Norco

LDEQ Accident Report

Accident #126165
State Police #10-05133
Accident Date2010-09-06
Report Date 2010-09-10
Follow-up Date 2010-10-29
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Sulfur Dioxide3 h 30 m3700 Sulfur Recovery Unit, 3700 Thermal OxidizerNOYESNO3,454.0 pounds

Accident Classified As:

Cause of Problem: Equipment Failure

Valve malfunction on 3700 Sulfur Recovery Unit resulted in sulfur dioxide elevated levels at 3700 Thermal Oxidizer.

Discharge Preventable - No

Report states event was result of an unanticipated mechanical or system controller malfunction.

Notes/Remedial Actions

RQ. Refinery letter states that the permitted SO2 rate and reportable quantity were exceeded. Workers diverted 3700 SFU feed stream to other Sulfur Recovery units, took manual control, and restarted unit. Refinery letter only; letter states that this is second follow-up report, but no first report is included in file. No LDEQ report.