Sources claim several production units were taken offline last Friday, causing a partial outage, though at least one is in the process of restarting.
Reuters said three out of five trains at the facility may have been affected, but immediate confirmation was not possible.
The NWS Project is one of the most advanced integrated gas production systems in the world where LNG, domestic gas, condensate and LPG are produced.
It includes five LNG processing trains, two domestic gas trains, six condensate stabilisation units, three LPG fractionation units as well as storage and loading facilities for LNG, LPG and condensate.
NWS is owned by the NWS Joint Venture, comprising BHP Billiton Petroleum (North West Shelf), BP Developments Australia, Chevron Australia, Japan Australia LNG (MIMI), Shell Development (Australia) and operator Woodside Energy.