AMSTERDAM, April 15 (Reuters) - Labour unions will decide onTuesday whether they will intensify strike action at Shell'sPernis oil refinery, Europe's largest, and Moerdijkchemical plants, union CNV said on Monday.
A strike that started on April 8, resulted in the shutdownof the thermal gasoil installation at the 400,000 barrel per dayrefinery on Monday, CNV spokesman Piet Verburg said.
Unions say the action has reduced output at Pernis to 65percent of capacity since early last week. Similar actionprevented planned maintenance at Moerdijk on Monday, Verburgsaid.(Reporting by Bart Meijer; editing by David Evans)