Notional Field Development Final Report - EBN

EBN Notional Field Development Plan
The same would be true for the production operations. Once gas production volumes are most
accurately projected, the engineering firm supporting this development project would use the Dutch
regulations in their design basis.
4.4.4.1 HSE Management – External Safety
In the Netherlands, the Decree on External Safety of Establishments (Dutch:
‘BesluitExterneVeiligheidInrichtingen’ also known as BEVI), aim to provide a minimum safety level for
humans (primarily in buildings). To be able to determine the risk, all establishments that store and/or
use hazardous substances (eg. chemical industries, refineries, chemical warehouses, tank storage
facilities, oil and gas facilities, etc), need to prepare a Quantitative Risk Assessment (QRA).
The results of such a QRA are expressed by means of two types of risk:
· Individual Risk (IR): the likelihood per annum for an individual to be killed as a result of an
accident (with hazardous substances) on the establishment. The IR is represented as risk
contours (10 -4 per year, 10 -5 per year, 10 -6 per year, etc) on a map;
· Societal Risk (SR): the likelihood per year for a group of people to lose their lives as the result of
an accident, (with hazardous substances) on the establishment.
In the Dutch QRA guideline (Dutch “HandleidingRisicoberekeningen BEVI” (HRB)), it is described in quite
some detail which parts of the establishment should be included, what type of accident scenarios (eg.
leakage or full rupture of a pipe or a vessel, blow out, etc.), failure frequency for equipment (tanks,
piping, etc.) should be applied, etc.
To be able to carry out the complex QRA-modelling, a mandatory computer model must be used (ie. the
computer model Safeti-NL). All accident scenarios and type of substances, as well as characteristics of
the surroundings, are given as input. The model will calculate the IR and SR.
For the SR, BEVI provides general guidelines. For the IR, the BEVI contains quite detailed requirements,
primarily with respect to the possibility of allowing buildings, where humans are or can be present
(houses, hospitals, child care centers, hotels, offices, workshops, etc) within the IR contours:
· Beyond the risk contour for 10 -6 per year (ie. a risk lower than 10 -6 per year) there are no
limitations for existing areas that have been built upon. This includes housing and planned
building developments, or for any other future developments;
· Between the risk contour of 10 -5 and 10 -6 per year there are possibilities to allow for existing
buildings, but new developments should be avoided;
· Within the risk contour of10 -5 per year (ie. a risk higher than 10 -5 per year), in general no
buildings are allowed.
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