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N
2
O
Nitrogen dioxide
NCS
Norwegian Continental Shelf
NORM
Normally Occurring Radioactive Materials
NO
x
Nitrogen oxides
OCNS
Offshore Chemical Notification Scheme
OSPAR
The Oslo and Paris Convention for the protection of the marine environment of the
North East Atlantic.
OSPRAG
Oil Spill Prevention and Response Advisory Group
PEC
Predicted Environmental Concentration – the expected concentration of a material in
the environment, taking into account the amount initially present in the environment,
its distribution and rates of natural or forced degradation and removal.
PLONOR
Pose Little Or NO Risk – used by OSPAR to classify substances used and
discharged offshore
PNEC
Predicted No Effect Concentration – the concentration below which exposure to a
substance is not expected to adversely impact the surrounding environment.
PON1
Petroleum Operations Notice 1
Produced Water
Water that comes to the surface with hydrocarbons during production, either
naturally from the reservoir or after injection into the reservoir to displace oil and lift
it to the surface.
Reinjection
The process by which some waste streams, such as produced water and drill cuttings,
can be pumped back into the reservoir or to deep rock strata, respectively. Not all
installations have this capability and suitable geology is required.
RIG
Radiological Issues Group
RSA
The Radioactive Substances Act 1993
SCiS
Step Change in Safety
SO
x
Sulphur oxides
Tank Washings
Liquid remaining in tanks after they have been emptied and cleaned, usually made up
of some of the original content mixed with the fluid used for cleaning.
UHCs
Unburned hydrocarbons
UKCS
UK Continental Shelf
VOC
Volatile Organic Compound
Well Stream Fluids
A term used to describe the total mass of fluids moving through the production
systems. This includes produced water and oil in produced water; the produced water
and oil reinjected; the total hydrocarbons produced (gas, oil and condensate); and the
total fuel gas use and gas flared.
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