The news comes as the owners of Kilroot announced plans to install clean-up equipment at the plant near Carrickfergus at a cost of Â£35 million.
The clean-up equipment will take two years to install.
( z1 install :ARG1 ( z2 equipment :purpose ( z3 clean-up ) ) :duration ( z4 temporal-quantity :quant 2 :unit ( z5 year ) ) )