Orica Limited (ASX:ORI) has suspended the restart of its ammonia plant at Kooragang Island. During the restart of the plant, the part that removes carbon dioxide was not working properly.
Investigations into the cause have started and Orica says it will solve the issue before resuming the restart.
Orica has also reported an elevated reading of sulphur dioxide from its Port Kembla plant to the Environmental Protection Authority.
The company is investigating the cause of the elevated reading, and says there has been no harm to the community, the environment or the plant.
Orica posted a net profit of $663 million in the 2011 financial year.